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4390784 |
One piece ion accelerator for ion mobility detector cells
The ion accelerator for an ion mobility detector cell is comprised of a ceramic tube coated inside with a thick film resistor composition across which a voltage potential difference is impressed to...
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4378499 |
Chemical conversion for ion mobility detectors using surface interactions
An ion mobility detector in which selectivity and sensitivity is enhanced by converting through surface interactions sample gas or vapor to a form more readily ionized or by converting through...
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4368388 |
Detection of polar vapors
The invention provides an improved apparatus for the detection of polar vapors in a gas which avoids the need for liquid reagents and requires little maintenance. In its simplest form the apparatus...
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4365157 |
Fluid analyzer utilizing a laser beam
A method for studying a fluid by forming a stream of the fluid, exciting the stream by causing a laser beam to impinge thereon to produce secondary particles or quanta, and subjecting the resulting...
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4296322 |
Method for analyzing organic substances
Organic substances, particularly those derived from a chromatograph, are analyzed by subjecting such a substance to laser radiation to produce negative ions of the substance, and by subjecting...
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4295046 |
Mass spectrometer
A transit time mass spectrometer for analyzing ions having different energies, particularly ions emitted under the influence of radiation, especially laser radiation. The mass spectrometer is...
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4271357 |
Trace vapor detection
An apparatus is provided for detecting trace quantities of chemical species in the form of a vapor by subjecting ions produced in a sample of the mixed gas under flow to an ion repulsive electric...
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4261698 |
Trace oxygen detector
Apparatus and a method for measuring trace amounts of oxygen in an atmosphere is described. An oxygen free nitrogen gas is used as the carrier gas and nitrogen, ultra high purity, with...
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4259573 |
Method of determining small concentrations of chemical compounds by plasma chromatography
An accurate method of determining by plasma chromatography the concentration of an ionizable gaseous or volatile chemical species A in air or another gaseous medium. Small, known increments of...
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4208585 |
Apparatus for focusing electromagnetic radiation on a sample
Apparatus for directing a beam of electromagnetic radiation onto a sample by focusing and deflecting the radiation, employing a spherical mirror for focusing and deflecting the radiation onto the...
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4204117 |
Sample analyzer
A sample analyzer includes a microscope for alternatively focusing an electromagnetic radiation on the sample to cause ion emission therefrom and visually observing the sample; a mass spectrometer...
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4072862 |
Time-of-flight mass spectrometer
The invention relates to a nonmagnetic time-of-flight mass spectrometer whose analyzer chamber accommodates a pulsed ion source, an ion detector and an ion reflecting system disposed on one and the...
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4059761 |
Separation of isotopes by time of flight
One of the isotopes of an element having several isotopes can be separated from the others in a dense, neutral plasma. Thus initially a neutral plasma is prepared including the element in question....
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3986111 |
Inverted voltage Gerdien Condenser
A "Gerdien Condenser" spectrometer for use in a moving air environment for measuring ion densities wherein a constant, electric field is provided in the direction opposite to prior art devices so...
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3953732 |
Dynamic mass spectrometer
A pulse-type ion source derived from a pulse laser produced plasma provides an ion beam which is analyzed in a time-dependent field which varies monotonically as an inverse function of time for the...
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3931516 |
Moving particle composition analyzer
Mass spectrometry apparatus for analyzing the composition of moving microscopic particles includes a capacitor having a front electrode upon which the particles impinge, a back electrode, and a...
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3924123 |
Measurement of second virial coefficients
The second virial coefficient of a gaseous mixture of first and second constituents is measured by passing a molecular beam of the gaseous mixture from a source to a detector spaced therefrom. The...
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3916187 |
Cosmic dust analyzer
Methods and apparatus are provided which employ ion time-of-flight techniques to determine the constituency of a high velocity particle of matter such as a micrometeorite. A charged target...
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3902064 |
Ion mobility mass spectrometer
An ion mobility mass spectrometer for helium doped gases including a helium resonance lamp having an emission at 584A and a window in the lamp partially transparent to radiation at 584A. The window...
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3868507 |
FIELD DESORPTION SPECTROMETER
A field desorption spectrometer which is capable of detecting and identifying one or more atoms of a specimen and/or all the atoms in an outer layer of the specimen or throughout the bulk of the...
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3863068 |
TIME-OF-FLIGHT MASS SPECTROMETER
A time-of-flight mass spectrometer with a pulsed ion source in which the ght path is symmetrical and contains at least two straight parts dimensioned so that velocity focusing as well as...
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3845301 |
APPARATUS AND METHODS EMPLOYING ION ANALYSIS APPARATUS WITH ENHANCED GAS FLOW
Plasma chromatograph response time is descreased by improvement of the gas flow. An ion-molecule reaction region is provided in tandem with a larger diameter drift region, and a gas outlet is...
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3767914 |
CONTINUOUS INJECTION MASS SPECTROMETER
The inventive mass spectrometer operates with an inhomogeneous oscillatory electric field and operates with the continuous injection of charged particles into the electric field. Particles of all...
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3727047 |
TIME OF FLIGHT MASS SPECTROMETER COMPRISING A REFLECTING MEANS WHICH EQUALIZES TIME OF FLIGHT OF IONS HAVING SAME MASS TO CHARGE RATIO
In a time of flight mass spectrometer ions accelerated from the source are reflected by a soft reflection field toward the detector, the magnitude and direction of the reflection field being such...
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3715590 |
MICROMETEOROID ANALYZER
A system for measuring the direction of flight, velocity, charge, mass and chemical composition of micrometeoroids. The analyzer includes two spaced arrays of interconnected capacitors and an ion...
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3699333 |
APPARATUS AND METHODS FOR SEPARATING, CONCENTRATING, DETECTING, AND MEASURING TRACE GASES
Apparatus and methods for sorting and detecting trace gases which undergo ion-molecule reactions. Positive or negative ions of the trace gas are formed by ion-molecule reactions between the...
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3673405 |
GAS INLET SYSTEM FOR A MASS SPECTROMETER
A mass spectrometer having an improved inlet system which assures that there is a minimum time lag, generally of the order of milliseconds, between changes in the composition of a material being...
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3668383 |
APPARATUS AND METHODS FOR SEPARATING, DETECTING, AND MEASURING TRACE GASES
Apparatus and methods for sorting and detecting trace gases which undergo ion-molecule reactions. Reactant ions and product ions may be sorted in accordance with their velocity in an electric field...
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3668382 |
SEPARATION AND DETECTION OF TRACE SUBSTANCES IN GASEOUS SAMPLES CONTAINING MOISTURE BY DILUTING WITH DRY AIR
Apparatus and methods for sorting and detecting trace gases which undergo ion-molecule reactions and for reducing the deleterious effects of moisture upon the measurements. Positive or negative...
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3668384 |
MASS SPECTROMETER
A mass spectrometer having means operatively connecting a circuit which provides a time lag between each ionizing electron pulse and each ion accelerating pulse to a delay circuit in an output...
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3663810 |
ELECTRON-MULTIPLIER-IONIZER MASS SPECTROMETER
An electron multiplier used together with additional elements to form a simple spectrometer for mass distribution studies. The multiplier is used to multiply a few electrons to provide an electron...
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3634683 |
TIME-OF-FLIGHT MASS SPECTROMETER WITH STEP-FUNCTION-CONTROLLED FIELD
The performance of a time-of-flight mass spectrometer is improved by applying a step voltage to the deflection plates to produce a step-function-controlled electrical field perpendicular to the ion...
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3629574 |
APPARATUS AND METHODS FOR SEPARATING ELECTRONS FROM IONS
Electrons are separated from ions by subjecting these charged particles to a drift field to cause them to move from a first region toward a second region and by interposing an electron filter in...
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3626181 |
GAS DETECTING APPARATUS WITH MEANS TO RECORD DETECTION SIGNALS IN SUPERPOSITION FOR IMPROVED SIGNAL-TO-NOISE RATIOS
Ions produced from a gaseous sample, including ions of trace gases to be detected, are separated in a drift cell in accordance with their velocity in an electric drift field and produce output...
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3626180 |
APPARATUS AND METHODS FOR SEPARATING, DETECTING, AND MEASURING TRACE GASES WITH ENHANCED RESOLUTION
Apparatus and methods for sorting and detecting trace gases which undergo ion-molecule reactions, trace ions being formed in a reactive gaseous medium and being analyzed in a nonreactive gaseous...
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3626182 |
APPARATUS AND METHOD FOR IMPROVING THE SENSITIVITY OF TIME OF FLIGHT ION ANALYSIS BY ION BUNCHING
Apparatus and methods for sorting and detecting ions in a drift cell, the electric fields applied to different regions of the cell being controlled at appropriate times to ensure the rapid...
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3626179 |
HIGH TEMPERATURE METHOD AND APPARATUS FOR ANALYZING GASEOUS SAMPLES
Analysis of gaseous samples containing inorganic trace substances which may be accompanied by organic interferents. The sample is passed through a high temperature pyrolizer or oxidizing burner to...
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3626178 |
GAS OR LIQUID CHROMATOGRAPH WITH DETECTOR EMPLOYING ION-MOLECULE REACTIONS AND ION DRIFT
Components of the effluent of a gas or liquid chromatograph are detected by reacting molecules of the components with primary ions to produce secondary ions which may be segregated in accordance...
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3621239 |
DETECTING A TRACE SUBSTANCE IN A SAMPLE GAS COMPRISING REACTING THE SAMPLE WITH DIFFERENT SPECIES OF REACTANT IONS
Methods for sorting and detecting trace gases which undergo ion-molecule reactions. Particular species of reactant ions are selected by choice of reagent gas and/or by reactant ion filtering to...
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3621242 |
DYNAMIC FIELD TIME-OF-FLIGHT MASS SPECTROMETER
A time-of-flight mass spectrometer which employs a dynamic electric field to accelerate charged particles. For a sample containing various charged particles and given field parameters, each...
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3621240 |
APPARATUS AND METHODS FOR DETECTING AND IDENTIFYING TRACE GASES
Trace components of a gaseous sample are separated at atmospheric pressure in a drift cell by producing ions of the trace gases through ion-molecule reactions and by separating the resultant...
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3619606 |
ION SOURCE FOR TIME-OF-FLIGHT MASS SPECTROMETER
A method and apparatus for eliminating unwanted signals (noise) at a mass spectrometer output by improving the formation of ions in a mass spectrometer with a pulse forming network which applies...
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3596088 |
TIME-OF-FLIGHT MASS SEPARATOR HAVING A FLOWING GAS STREAM PERPENDICULAR TO AN ION DRIFT FIELD FOR INCREASED RESOLUTION
Apparatus and methods for sorting and detecting trace gases which undergo ion-molecule reactions. Positive or negative ions of the trace gas are formed by ion-molecule reactions between the...
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3593018 |
TIME OF FLIGHT ION ANALYSIS WITH A PULSED ION SOURCE EMPLOYING ION-MOLECULE REACTIONS
Apparatus and methods for sorting and detecting ions in a drift cell, the electric fields applied to the cell being controlled at appropriate times to minimize dispersion of bunched ions produced...
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3586853 |
AXIAL BEAM TIME OF FLIGHT MASS SPECTROMETER
A time of flight mass spectrometer wherein the ionizing electron beam is in axial alignment with the path of the ions produced thereby and wherein an electron multiplier is utilized to generate a...
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3582648 |
ELECTRON IMPACT TIME OF FLIGHT SPECTROMETER
An electron impact time of flight spectrometer including means providing monochromatic electrons of a predetermined kinetic energy which are caused to impinge upon a sample material so that some of...
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3576992 |
TIME-OF-FLIGHT MASS SPECTROMETER HAVING BOTH LINEAR AND CURVED DRIFT REGIONS WHOSE ENERGY DISPERSIONS WITH TIME ARE MUTUALLY COMPENSATORY
A mass spectrometer is disclosed which is based on the linear time-of-flight principle. Initial ion energies are compensated for by combining a curved drift region with a linear drift region so...
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3553452 |
TIME-OF-FLIGHT MASS SPECTROMETER OPERATIVE AT ELEVATED ION SOURCE PRESSURES
A time-of-flight mass spectrometer for the investigation of ion-molecule reactions at ion source pressures up to about 1 Torr. The ion source is operated with a continuous electron beam and a...
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3482091 |
ELECTRON TRANSPARENT SHIELD FOR SEPARATING REGIONS OF DIFFERENT FIELD INTENSITIES
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3436966 |
ROCKET ENGINE GAS SAMPLING SYSTEM
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