Timespan mass spectrometer with non-linear reflector. RU patent 2504045.
 Differential ion mobility spectrometer / 2503083Differential ion mobility spectrometer has a cylindrical chamber for generating analyte ions, an ionisation source, in the region of which there is generation of reactant ions, an electrode system, an ion aperture, an analytical gap formed by two concentric cylindrical electrodes, an ion detector, a periodic polarity-asymmetric voltage generator, which provides an output on a section of a nonlinear field relationship of ion mobility, a compensating voltage source, a high-frequency voltage source, concentrically arranged relative the inner cylindrical electrode of an additional chamber, having an input and an output for ionising gas, in which there is an ionisation source and an ejecting voltage source is connected. |
 Mass-spectral device for quick and direct analysis of samples / 2487434In a mass spectral device for quick and direct analysis of samples, comprising an ioniser, representing a hollow cathode with a pulse glow discharge, placed into a gas-discharge chamber with inert gas and a time-of-flight mass spectrometer, the hollow cathode is an assembled structure made of two composite parts placed into a pumped cylinder, the end of which with the help of an elastomer vacuum toroidal seal is pressed to the surface of a quartz disc, being a part of a discharge cell, besides, one of the parts of the hollow cathode is a hollow cylinder made of a monoisotope metal and is rigidly fixed in a jacket of the proposed device, and the second part is made in the form of a holder, besides, for analysis of dry residue of solutions, the holder represents a disc made from the same metal, with grooves having spherical surface, and for analysis of solid-state samples - the disc with cylindrical holes, where samples are inserted. |
 Multi-reflecting time-of-flight mass-analyser and time-of-flight mass-spectrometer having said mass-analyser / 2458427Multi-reflecting time-of-flight mass-analyser has two parallel gridless ion mirrors, each having an elongated structure in the direction (Z) of drift. These ion mirrors provide a convoluted ion path formed by multiple reflections of ions in the direction (X) of flight, orthogonal to the direction (Z) of drift. The analyser also has an additional gridless ion mirror for reflecting ions in the direction (Z) of drift. During operation, ions are spatially separated according to the mass-to-charge ratio due to different time of flight along the convoluted ion path and ions having essentially the same mass-to-charge ratio are subject to energy focusing with respect to the direction of flight and drift. |
 Ion mobility spectrometer / 2455725Ion mobility spectrometer has a reaction chamber (1), a drift electrode (2) and an ion detector (3). The reaction chamber (1) is fitted with an input port (4) for feeding the analysed substance in a mixture with a carrier gas and a corona discharge source made in form of segment of a hemisphere (5) on whose inner surface facing the drift electrode (2) there are metal spikes (6) with small curvature radius at the apex of the spikes. A controlled grid valve (7) is placed between the ion source and the drift electrode (2). The drift electrode (2) is made from high-resistivity material with resistivity in the range of (0.3-2.0)×104 ohm×m, and is connected to a drift voltage (8) source. An ion detector (3) is placed at the output of the drift electrode (2). |
| Composition for testing ion mobility spectrometer and method of testing ion mobility spectrometer using said composition / 2433396 Disclosed composition contains a mixture of isopropyl alcohol as the base and (0.25-2.00)% aqueous solution of b-diethylaminoethyl ether of paraaminobenzoic acid hydrochloride as an aromatic additive with the following ratio of components of the mixture, vol. %: aromatic additive 0.001-0.003 and the base - the rest. The disclosed method involves preparation of a test sample, putting said sample into the spectrometer under test, obtaining an ion mobility spectrum and making a decision on identification of the test sample based on results of comparing the obtained ion mobility spectrum with a reference spectrum. The described composition is used when preparing the test sample. |
 Device for directing ion beam, having electrodes on parallel plates / 2431213Device for directing an ion beam along an essentially continuous beam line in at least one field which creates a force acting on the ions in the said ion beam, has at least one section having an essentially flat plate-like multi-terminal network having a top flat plate and bottom flat plate. Said force is essentially symmetrical in the parallel direction or essentially asymmetrical in the perpendicular direction relative the centre plane in which the beam line lies. Each of the said plates has first electrode terminals across which corresponding potential values are applied and which generate at least part of the said at least one field. The boundary of the end field lies on each end of the said at least one section and said first electrode terminals are essentially thin and flat. |
 Ion mobility spectrometer / 2431212Ion mobility spectrometer has a flow-type ion-drift chamber, a repelling electrode and a collector, an ionisation source and an aperture grid, dynodes, a first gas volume, a second gas volume, a pump and a switching valve. The spectrometer also includes a first atomising jet and a second atomising jet, a third atomising jet and a fourth atomising jet. The first gas volume consists of a first filter for cleaning gas connected to a first receiver, and the second gas volume consists of a second filter for cleaning gas connected to a second receiver. The spectrometer can have a third filter connected to the switching valve and linked to the atmosphere. |
 Drift tube structure for ion mobility spectrometre / 2398309Ion mobility spectrometre has a bearing flat insulating substrate, a set of electrodes mounted on the substrate for generating an electric field, lying perpendicular to the substrate, a corona discharge based ion source, a collector and a sealed casing around the electrodes. One side of the sealed casing is a flat insulating substrate on which there are heating elements and temperature control sensors. |
 Mass spectrometre / 2393579Proposed device comprises ion mobility spectrometre, ion-optical lenses, interface of differential pump-out, time-of-flight analyser and ion detector. Note here that ion mobility spectrometer comprises ion formation chamber, drift tube with aperture element, ion gate, drift zone, gas curtain zone of mass spectrometre, drift gas inlet and power supply. Ion source of mass spectrometre comprises axially symmetric casing with walls accommodating radially-directed sample intake and ionisation device with ionising agents. Point whereat said intake device axes intersect is located opposite the apex of aperture element representing a convex-face wall with hole to intake ion at its top. Time of flight analyser represents a cylindrical condenser accommodating assembly of orthogonal acceleration with ejector electrode and ion detector. |
 Time-of-flight mass spectrometre / 2381591Proposed invention relates to mass spectrometry with orthogonal entry of ions and is widely used in organic and bioorganic chemistry, immunology, biotechnology and medicine when ionising analysed substances using an electron impact method, electrospray etc. The time-of-flight mass spectrometre consists of an electrospray type ion source, an orthogonal ion accelerator (pulser), which includes regions for accumulation and acceleration of ions, field-free drift space, two-stage mirror and detector. The accumulation region of the pulser is made in form of a monopole whose grounded electrode edge is combined with the grounded grid of the acceleration region. There is an ion exit slit in the grounded electrode edge of the monopole. |
 Ion spectrum measurement process and transit-time ion spectrometer / 2266587Charge and mass composition is measured by accelerating ions in accelerating gap formed in vacuum chamber between input end of drift tube and plasma when negative-polarity voltage pulse of length shorter than transit time in drift tube of accelerated ions of plasma being analyzed is applied to drift tube at maximal Z/Mi ratio, where Z is ion charge in plasma; Mi is ion mass. Voltage pulse is supplied from negative-polarity accelerating-voltage pulse source whose high-voltage lead is electrically connected to drift tube and other lead, to vacuum-chamber ground. When in transit, accelerated ions are divided within drift tube into mass, charge, and energy clots and separated clots are recorded by detector. |
 Analyzer of energies of charged particles / 2294579Analyzer of charged particles energy contains sample (emitting charged particles), external electrode and internal electrode with two circular slits and detecting system. Axial and radial gradients of energy analyzer field potential are synchronized along movement route of charged particles by setting appropriate configuration of equipotential surfaces of analyzer electrodes. |
 Transit-time mass spectrometer / 2295797Proposed mass spectrometer that can be used for solving problems in organic chemistry, biochemistry, immunology, medicine, biotechnology, environment control, for evaluating composition and properties of materials in industry and scientific research has pulsed ion source, drift space with two flat braking-field wire-net capacitors and detector installed in tandem at its end is provided with second drift space formed by common electrodes of flat wire-net capacitors spaced along device axis; potential of second drift space is braking one with respect to first drift space. |
 Transit-time method for metering charge and mass composition of plasma ions / 2314594Proposed method involves immersion of drift tube into plasma followed by acceleration of ions by applying negative-polarity voltage pulse across drift tube, pulse length being shorter than its transit time within drift tube carrying analyzed plasma accelerated ions at highest Z/Mi ratio, where Z is degree of ion charge in plasma; Mi is ion mass; this is followed by separating ions with respect to their mass, charge, and energy as they are conveyed through equipotential space of drift tube, as well as measurement of ion current pulse at drift tube outlet; then second measurement similar to first one is made but for different length of negative-polarity voltage pulse supplied to drift tube; charge and mass composition of plasma ions is evaluated by subtracting results of measuring ion current pulses at outlet of drift tube obtained at different lengths of negative-polarity voltage pulses. |
 Dust impact mass spectrometer / 2326465Invention relates to the instrument engineering, automation means, and control systems, namely, to the space research area. The dust impact mass spectrometer contains a hemispheric target with one opening in the middle of its surface, which increases the probability of target impact with a micrometeorite at the same dimensions of the mass spectrometer. The accelerating gap is a limited by a hemispheric target and a hemispheric grid, located concentrically, which provides equal ion trajectory lengths, thus eliminating the measurement result dependence on the impact location and increases the measurement result reliability. The parabolic reflector focuses ions into a parallel beam directed exactly to the hemispheric target opening. |
 Mass selective device and analysis method for drift time of ions / 2327245Invention pertains to the field of dynamic mass analysis of charged particles in alternating HF fields. The mass-selective method of separating ions is based on the use of an analyser, consisting of two flat parallel electrodes with linear-discrete and anti-phased HF potential distributions on the Y axis and a flat earthed electrode, and a limiting electrode with values y≥0. The discrete electrodes are made in the form of capacitor or inductive linear HF voltage dividers. Applied to the electrodes are two anti-phased HF voltages with constant amplitude Um and frequency, ω for which a linear alternating electrical field is formed in the analyser on the X and Y axis. Ions are put into the analyser through the opening in the flat earthed electrode with initial coordinates xn>0, уn=0 and initial velocities vu, inversely proportional to the masses, m of the analysed ions. Ions on the X and Y axes have almost harmonic oscillations with the same amplitude уm and period T, proportional to mass m. During the analysis period the x coordinate of the ions changes to the opposite x(tA)=-xn, while the y coordinate becomes equal to y(tA)=0. The sorted out ions in accordance of their mass m, successively pass into the analyser and reach the registration system. |
 Ion mobility spectrometer / 2328791Ion mobility spectrometer contains the neoformation chamber with installed ion source, drift chamber with the ion collector and aperture mesh, ejecting electrode and the mesh gate which form the ejection area, holes for supplying the mixture of the analised substance with carrier gas, and drifting gas and for outputting the drift gas and the mixture of the analised substance with carrier gas. The chamber of ion-formation with the ion source is placed out of the ejection area and connected with it via adapter with the canal for ion transportation; at that, the ion-formation chamber has the potential of the mesh gate. The adaptor canal has the conical shape, at the ion-formation chamber, which becomes slit-like at the ejection area. The planes of the slit-like canal are parallel to the mesh gate. The length of the slit-like canal is selected so as to guide the ion and carrier gas flow along the ejecting electrode and the mesh gate. The length of the slit-like canal is more or equal to the canal's width, and the canal's width is equal to or less than the distance between the mesh gate and the ejecting electrode. |
 Method and device for identification of organic compounds / 2329563Invention is related to the field of gas analysis, in particular of vapours of explosive, narcotic and poisoning substances. Method of organic compounds identification consists in measurement of volt-ampere characteristics with application of surface-ionisation source of ions, in which measurement of volt-ampere dependence is carried out in interval of voltages "thermal emitter of ions - electrode for ion current control" from U1 to U4, volt-ampere dependence section is separated from U2 to U3>U1, in which value of current of organic compounds ions quadratically depends on value of voltage "thermal emitter of ions - electrode for ion current control", at that U1 and U4 are selected based on conditions U4>U3, U1<U2, at that volt-ampere dependence is used for determination of value of organic compounds ions drift mobility and/or for determination of energy activation value of organic compounds molecules ionisation on thermal emitter surface, at that for determination of organic compounds ions drift mobility value section is used from U2 to U3 of volt-ampere characteristic, and for determination of energy activation value of organic compounds molecules ionisation section is used from U3 to U4 of volt-ampere characteristic. Device is suggested for identification of organic compounds, which contains two structurally identical surface-ionisation sources of organic compounds ions, at that inlet openings of channels of nozzles for intake of analysed air flows of the first and second sources of ions are combined into common channel of common nozzle for intake of analysed air flow. |
 Mass spectrometer for macromolecule analysis / 2332748Mass spectrometer contains holder with analysed substance, ionisator and supplier of macromolecules to mass analyser, and detector. Mass analyser is connected to holder with analysed substance, and detector is based on matrix of micromechanical cantilevers providing determination of interaction time point and point where accelerated macromolecule contacts with petal surface of micromechanical cantilever, providing macromolecule pulse transfer to micromechanical cantilever petal, and following deviation of petal by the distance determined by weight and energy of macromolecule. Thus detector is implemented within consistently optically connected emitting sources, collimating optics, micromechanical cantilever matrix, projecting optics and photodetector, while micromechanical cantilever matrix thereof is designed as detector substrate where micromechanical cantilevers are mounted, thus micromechanical cantilever is designed as part of leg, arm, reflecting layer. Micromechanical cantilever matrix is multielement. |
 Mass-sensitive selective concentrator for ion mobility spectroscopy (ims) / 2379678Invention relates to analytical instruments, particularly, to devices intended for preliminary concentration of analyzed sample and combined with analytical instrument that can be used to produce fast-operation analyzers of poisonous or explosive substance concentration in air. Proposed concentrator comprises analyzed sample fast-desorption absorbing element and acoustic transducer with its output signal depending upon mass of absorbed sample. Acoustic transducer represents a piezoelectric plate-sound conductor with two built-in interdigital electromechanical transducers (IDT), designed to excite and receive surface acoustic waves (SAW). While absorbing element represents a film made from molecular imprinting polymer applied onto said plate-sound receiver surface and consisting of two sections, i.e. small-area detecting section located on SAW propagation line, and larger-area concentrating section located outside acoustic line. Said concentrating section can comprise two additional sections to double as SAW-absorbing coatings. To this end, said additional sections are arranged on plate-sound receiver surface, on SAW propagation line outside the space between IDT. |
FIELD: instrument making.
SUBSTANCE: timespan mass spectrometer with a non-linear reflector comprises a drift tube, a source of ions, an accelerating net, a source of current and voltage, a source of pulse voltage that varies in time, a net that limits the non-linear reflector, a non-linear reflector and a receiver of ions in the form of a microchannel plate. The non-linear reflector is made in the form of a set of rings of various diameter, the source of current and voltage is connected to rings, the source of pulse voltage that varies in time is connected to the accelerating net, the drift tube and the net that limits the non-linear reflector are grounded.
EFFECT: higher resolution and sensitivity during analysis of ion conductivity of neutral gas.
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The invention relates to the instrument engineering, automation and control systems, namely, the field of space research.
Known time-of-flight mass-spectrometer containing the target accelerating grid push period, electrostatic linear reflector, ion collector (article: B.A., A.I. Linear - JETP, 1979, vol. 76, B.5, .1500-1505). Through the use of linearly changing electric field in achieved the value higher resolution compared to the classical scheme of the mass spectrometer with the same dimensions and capacity of the accelerating gap.
Drawbacks of the device are low resolution and a small range of the measured masses.
More perfect is the mass spectrometer with nonlinear longitudinal axis of the magnetic field (the patent №1651327 H01J 49/40 publ. BI №19, 23.05.91,). Time-of-flight mass spectrometer, which guarding Assembly of the ion source to increase the sensitivity is made in the form of a ring, inner diameter is greater than or equal to the diameter of the detector, and the tube is installed coaxial cylindrical system of internal and external diameter of which is respectively equal to internal and external diameter of the wire Assembly of the ion source. The disadvantage of this design is the difficulty in precisely the formation of stresses on the elements of coaxial cylindrical system, which the authors offer a pick up experimentally.
The closest to the technical nature of the claimed mass spectrometer is time-of-flight mass spectrometer (patent No. 2239910, 7 H01J 49/40 publ. Bul. №31, 10.11, 2004), containing ion source, receiver ions drift tube, reflector ions, which is designed as a solid resistive film.
The disadvantage of the prototype are: impossibility of perestroika nonlinearity of the field in nonlinear reflector through the use of the principle of continuous education field and as a consequence, the high resolution of the instrument in the field of heavy masses under severe weight and size limitations, the complexity of manufacturing ion reflector.
In the basis of the invention is a device for the analysis of neutral gas ions with a high resolution, high sensitivity, while minimizing weight and size characteristics.
The task is achieved by the fact that the time-of-flight massspectrometer with nonlinear reflector, containing the tube of the drift, the ion source, the accelerating grid, current source and voltage source to be modified in time of the pulse voltage grid that restricts nonlinear reflector, non-linear reflector and receiver ions in the form of a microchannel plate, according to the invention, nonlinear reflector is made in the form of a set of rings of various diameters, current source and voltage connected to the rings, the source of the modified time of the surge voltage is connected to the accelerating grid drift tube and net limiting nonlinear reflector grounded.
The essence of the device is illustrated by drawings, where:
figure 1 shows a diagram time-of-flight mass spectrometer with nonlinear reflector
figure 2 - dependence of the electrostatic field of the longitudinal coordinate of the reflector.
Time-of-flight mass spectrometer with nonlinear reflector contains a tube drift 1, ion source 2, accelerating grid 3, current source and voltage 4, the source of the modified time of the pulse voltage 5, grid 6, the limiting nonlinear reflector 7, receiver ions in the form of a microchannel plate 8 and ring 9.
Source of current and voltage 4 is connected to the rings 9, the source of the modified time of the pulse voltage 5 is connected to the accelerating grid 3, drift tube 1 and net 6 grounded.
Feature of the device is that the linear distribution of the capacity of the rings 9, electrostatic field of nonlinear reflector 7 will be non-linear. This is achieved due to the peculiarities of the formation of the electrostatic field annular electrode. Field of such electrode can be described by the equation:
Where Q is the charge distributed along the ring R is the radius of the ring, z is the distance from the plane of the ring to the point, in which the calculated electrostatic field on the symmetry axis of the ring.
As seen from (1) the maximum Ez will be in the point:
Then to achieve the maximum value of a field in nonlinear reflector shall assume that the radius of the ring mirrors is calculated from the condition (3) according to the formula:
where ai is the distance from the ring to the point of maximum field mirrors.
Then, the electrostatic field of the whole Assembly of the rings (figure 2) will be determined from the expression:
The maximum field will be observed within the first ring, and the potential it will equal zero.
The distance between the rings can be chosen constant, for ease of fabrication. The potential of the rings grows linearly and to reflect ions should in 2 times exceed the capacity of the accelerating grid. Thus, in a linear potential is realized nonlinearity of the field reflector, as well as a linear divisor potential is much easier to manufacture and has high accuracy provides the continuity and high accuracy of the implementation of the function changes the electrostatic field inside the nonlinear reflector 7. Changing potential of the rings 9, you can rearrange the nonlinear reflector 7 on different ranges of mass of the ions. Thus, an increase in range of the studied masses.
Time-of-flight mass-spectrometer, containing the tube of the drift, the ion source, the accelerating grid, current source and voltage source to be modified in time of the pulse voltage grid that restricts nonlinear reflector, non-linear reflector and receiver ions in the form of a microchannel plate, wherein the nonlinear reflector is made in the form of a set of rings, the diameter of which increases as one moves away from ion source power supply voltage is connected to the rings, the source of the modified time of the surge voltage is connected to the accelerating grid drift tube and net limiting nonlinear reflector, grounded.