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5347126 |
Time-of-flight direct recoil ion scattering spectrometer
A time of flight direct recoil and ion scattering spectrometer beam line (10). The beam line (10) includes an ion source (12) which injects ions into pulse deflection regions (14) and (16)...
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5338931 |
Photoionization ion mobility spectrometer
An improved photoionization ion mobility spectrometer is disclosed which utilizes a flashlamp as the source for ionization. A gas sample is introduced via a carrier gas into a ionization chamber...
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5331158 |
Method and arrangement for time of flight spectrometry
The apparatus and method of the present invention multiplexes or gates particle beams to provide continuous data collection useful in time-of-flight mass spectrometry. The multiple particle beams...
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5304797 |
Gas analyzer for determining impurity concentration of highly-purified gas
Ultra-low concentrations of impurities such as water in a highly-purified gas are analyzed by a system having an ion source chamber and a drift chamber. The ion source chamber ionizes one of a...
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5300773 |
Pulsed ionization ion mobility sensor
An ion mobility sensor for obtaining measurements of concentrations of constituents of multicomponent gaseous samples. The sensor having an ionization region into which the sample is entered...
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5300774 |
Time-of-flight mass spectrometer with an aperture enabling tradeoff of transmission efficiency and resolution
A time-of-flight mass spectrometer in which sample ions are generated from a target and are focussed into an ion beam that is incident onto a detector. A barrier that defines an aperture in the...
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5294797 |
Method and apparatus for generating ions from thermally unstable, non-volatile, large molecules, particularly for a mass spectrometer such as a time-of-flight mass spectrometer
Method for generating ions from thermally unstable, non-volatile, large molecules, particularly for a mass spectrometer such as a time-of-flight mass spectrometer. A specimen substance comprising...
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5294794 |
Automatic compensation for ion mobility sensor
A system for compensating for changes in pressure and temperature in an ion mobility sensor has first and second electrodes positioned a selected distance apart, with a unidirectional electric...
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5283199 |
Chlorine dioxide monitor based on ion mobility spectrometry with selective dopant chemistry
An improved ion mobility spectrometer (IMS) and method for operating the same which enables analysis of chlorine dioxide in a mixture of gases which also includes the interferant chlorine. A...
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5280175 |
Ion mobility spectrometer drift chamber
The invention concerns a gas tight drift chamber of an ion mobility spectrometer with ring electrodes separated by insulating rings. In order to simplify the construction and to improve the...
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5245192 |
Selective ionization apparatus and methods
A gaseous sample that is to be analyzed is passed through an array of fine slits whose edges are covered with electrodes of opposite polarities to which is applied a variable electric potential....
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5244814 |
Decay detection in wood
The presence of decay is determined in wood by testing a sample. The wood tested may be standing timber, cut timber or when coated in building structures. The testing occurs in very short time...
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5234838 |
Ammonia monitor based on ion mobility spectrometry with selective dopant chemistry
An improved ion mobility spectrometer (IMS) and method for operating the same which enables analysis of ammonia in a mixture of gases when air is used as the carrier gas and the drift gas in the...
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5235182 |
Spectrometer
In an ion mobility spectrometer comprising a spectrometer tube with an ion hutter, an ionization source within a reaction chamber, and a drift chamber, the improvement comprises providing in or...
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5233189 |
Time-of-flight mass spectrometer as the second stage for a tandem mass spectrometer
A time-of-flight mass spectrometer is disclosed that can be used as the second stage of a tandem mass spectrometer, a so called MS-MS system, for the mass analysis of molecule fragment ions. In...
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5227628 |
Ion mobility detector
There is disclosed an ion mobility detector having a sample inlet membrane means for flowing a sample passing through the membrane over an ionisation source to an ion reaction region, with which...
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5218203 |
Ion source and sample introduction method and apparatus using two stage ionization for producing sample gas ions
A high pressure interface device for introducing sample ions to a drift tube, an ion detection means or a mass mobility measurement means, having an ion source ionization region containing an...
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5210412 |
Method for analyzing an organic sample
Described is a method and apparatus for analyzing an organic sample. In the preferred embodiment, this method and apparatus allows the determination of the base sequence of a nucleic acid by...
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5206508 |
Tandem mass spectrometry systems based on time-of-flight analyzer
A tandem mass spectrometry system, capable of obtaining tandem mass spectra for each parent ion without separation of parent ions of differing mass from each other, comprising an ion source, (1) a...
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5202561 |
Device and method for analyzing ions of high mass
Detector device for analyzing ions of high mass using a time-of-flight (TOF) analytical method, consisting of a mass spectrometer 1, accelerating electrodes 2 and a magnetic field and/or electric...
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5202563 |
Tandem time-of-flight mass spectrometer
A tandem time-of-flight mass spectrometer comprises a grounded vacuum housing, two reflecting-type mass analyzers coupled via a collision chamber, and flight channels electrically floated with...
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5200614 |
Ion mobility spectrometers
An ion mobility spectrometer is provided which employs an electron capture process. A sample gas stream is irradiated to produce positive ions and electrons in an ionization chamber. An open grid...
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5191212 |
Analytical system with electrothermal atomizer and mass spectrometer for atomic and molecular analysis
The analytical system for measuring the concentrations of elemental or molecular constituents of an existing solid, liquid or aerosol sample, the sample being dried by an electrothermal atomizer,...
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5189301 |
Simple compact ion mobility spectrometer having a focusing electrode which defines a non-uniform field for the drift region
A compact ion mobility spectrometer (IMS) with increased sensitivity and resolution for detecting the composition of an unknown substance is disclosed. The IMS comprises a unitary cylindrical...
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5184015 |
Charged particle mobility refrigerant analyzer
A method for analyzing a gaseous electronegative species comprises the steps of providing an analysis chamber; providing an electric field of known potential within the analysis chamber; admitting...
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5180914 |
Mass spectrometry systems
A mass spectrometry system comprises a source of ions for analysis, an ion storage device for separating the source ions as a function of their different mass-to-charge ratios, means for...
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5171987 |
Combined magnetic sector mass spectrometer and time-of-flight mass spectrometer
A mass spectrometry system includes a double-focusing magnetic sector mass spectrometer and a time-of-flight spectrometer arranged in parallel. The spectrometers share a common means for exciting...
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5168158 |
Linear electric field mass spectrometry
A mass spectrometer and methods for mass spectrometry. The apparatus is compact and of low weight and has a low power requirement, making it suitable for use on a space satellite and as a portable...
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5162649 |
Ion mobility detector
An ion mobility detector is disclosed having a drift tube of non-electrically conductive material and a series of spaced conductive rings disposed upon the exterior surface of the tube. An...
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5160840 |
Time-of-flight analyzer and method
A time-of-flight mass spectrometry and method of operating a TOF mass spectrometer are disclosed. The mass spectrometer includes one or more electrically charged accelerating plates for...
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5144127 |
Surface induced dissociation with reflectron time-of-flight mass spectrometry
Surface induce dissociation (SID) in a reflectron tandem time-of-flight mass spectrometer is demonstrated using a movable "in-line" SID surface in the reflectron lens. For collisions under 100 eV,...
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5140158 |
Method for discriminative particle selection
The invention is a method and means for separating ions or providing an ion beam. The invention generates ions of the isotopes to be separated, and then provides a traveling electric potential hill...
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5128543 |
Particle analyzer apparatus and method
A time-of-flight analyzer, such as a secondary ion surface analyzer, and method are disclosed wherein a beam of charged particles is created, magnified, directed along a path to a detector,...
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5120958 |
Ion storage device
An ion-storage device has an electrode structure for subjecting ions in a defined region along a path P to an electrostatic retarding field. The electrostatic retarding field is in the form of an...
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5117107 |
Mass spectrometer
A time of flight mass spectrometer includes an ion source (10) a lens system (18, 19) to focus the ions into a beam (21), an orthogonal accelerator (22) comprising two parallel electrodes one of...
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5109157 |
Ion mobility detector
An ion mobility detector comprising a one piece dielectric tube with conductive bands as field elements for accelerating ions formed in a reactor region of the tube and passed to a drift region of...
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5105082 |
Laser ionization sputtered neutral mass spectrometer
An ion beam is impinged against a solid sample to sputter neutrals. The neutrals thus sputtered are ionized by a UV laser beam to obtain photoions. The photoions are guided to a quadrupole mass...
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5095206 |
Method and apparatus for improving the specificity of an ion mobility spectrometer utillizing sulfur dioxide dopant chemistry
An improved ion mobility spectrometer (IMS) and method for operating the same which enables analysis of a specific acid gas analyte in a mixture of such gases when air is used as the carrier gas...
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5087814 |
Method and apparatus for counting charged particles
Charged particles are generated and are subjected to a spatial distribution. Images of the distributed charged particles are formed on a screen and are processed to count the number of the charged...
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5087815 |
High resolution mass spectrometry of recoiled ions for isotopic and trace elemental analysis
Disclosed is a method and apparatus for the measuring of isotopic ratio determination of elements on metallic, semi-conducting or insulating surface. The method involves pulsing an ion beam of at...
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5083019 |
Preconcentrator for ion mobility spectrometer
A system for and a method of increasing the sensitivity of organic vapor detection in ion mobility spectrometer by as much as three (3) orders of magnitude. Vapors are collected from the gas to be...
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5077472 |
Ion mirror for a time-of-flight mass spectrometer
An ion mirror for a time-of-flight mass spectrometer comprises a monopole electrode structure which operates at d.c. voltage. This electrode structure defines a field region in which an incident...
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5073713 |
Detection method for dissociation of multiple-charged ions
Dissociations of multiple-charged ions are detected and analyzed by charge-separation tandem mass spectrometry. Analyte molecules are ionized to form multiple-charged parent ions. A particular...
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5071771 |
Identification of wood species
A method and apparatus to produce an ion mobility signature representing a wood sample provides a method of comparing signatures to identify the species of the wood sample. A method of producing an...
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5070240 |
Apparatus and methods for trace component analysis
A method and apparatus for analyzing chemical species includes an ion source at or near ambient pressure and a time-of-flight mass spectrometer which receives the ions, created at the ion source,...
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5068535 |
Time-of-flight ion-scattering spectrometer for scattering and recoiling for electron density and structure
There is disclosed a time-of-flight ion-scattering spectrometer which comprises an ultra-high vacuum chamber sized to accommodate a flight path of sufficient length to provide unit mass resolution...
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5065018 |
Time-of-flight spectrometer with gridless ion source
A time-of-flight spectrometer includes a gridless ion source for generating ions. The ions are reflected by a reflector and detected in a detector. Different types of ions, indicative of the...
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5061850 |
High-repetition rate position sensitive atom probe
Atom probe apparatus includes an emission tip from which atoms can be evaporated in atomic emission events, a position sensitive detector for detecting the position and timing of the charge cloud...
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5053343 |
Selective ionization of gas constituents using electrolytic reactions
An ion mobility spectrometer, ionization detector and mass spectrometer is described having a reaction region, and a region for introducing a sample gas, liquid or solid samples into the reaction...
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5047123 |
Apparatus for clarifying liquids
A system for clarifying liquids, having particular utility in dry cleaning operations. The system includes a filter apparatus which includes a plurality of axially spaced filter elements each...
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