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  • 1
    Electronic Resource
    Electronic Resource
    Determination of C1-C4 alkanes by ion mobility spectrometry (1991)
    s.l. : American Chemical Society
    Analytical chemistry 63 (1991), S. 2295-2300 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00020a019
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Determination of C1-C4 alkanes by ion mobility spectrometry (1991)
    American Chemical Society
    Details
    Publication Date: 1991-10-15
    Print ISSN: 0003-2700
    Electronic ISSN: 1520-6882
    Topics: Chemistry and Pharmacology
    Published by American Chemical Society
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    PAPER CURRENT
  • 3
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    Analysis of Ultra-Pure Gases by Ion Mobility Spectrometry (1995)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: Work has continued with the evaluation of the Ion Mobility Spectrometer (IMS) for the analysis of gases having low parts-per-billion (10(exp -9)) water concentration. A modified PCP, inc. MMS-160 Mobility Mass Spectrometer System was used for the analysis of ultra-pure argon and nitrogen. The MMS-160 system permits the mass-identification of unique reactant and product ions observed in the reduced-water host gases. When the water is removed to low ppb levels, higher energy reactant ions are observed. In nitrogen, distinct odd- and even-numbered nitrogen cluster ion mobility peaks are observed, as well as adduct ion peaks from the trace contaminants in the gas. Argon also produces a cluster ion mobility peak and adduct ion peaks from trace components in the gas. Levels of contaminants in these ultra-pure gases can be determined from the ion mobility spectra. A calibrated source was used to provide variable known quantities of water to the pure gas supply of the IMS.
    Keywords: Inorganic and Physical Chemistry
    Type: Fourth International Workshop on Ion Mobility Spectrometry: Proceedings of an International Speciality Workshop
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Determination of C1-C4 alkanes by ion mobility spectrometry (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Results are presented from a comparison between two ion-mobility-spectrometer (IMS) methods of sample ionisation: a conventional IMS with very dry helium and an IMS using metastable helium ionization. As one of the tests, a mixture of several hydrocarbons expected to be the components of Titan's atmosphere (made of ethane, ethylene, acetylene, propane, n-butane, isobutane, and propyne in concentrations from 20 to 200 ppm) was analyzed by both methods. Results from the dry-He IMS showed that the dry-helium approach was more adequate for the analysis of these gases than the metastable-helium IMS approach. In the metastable-He approach, in which several versions of He ionization reaction were tested, the spectra produced were not as clear as the conventional IMS spectra, due to the fact that the strong electric field introduced in the reaction region to generate metastable helium affected the gating, resolution, and collection of the ions.
    Keywords: CHEMISTRY AND MATERIALS (GENERAL)
    Type: Analytical Chemistry (ISSN 0003-2700); 63; 20, O
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    A digital boxcar integrator for IMS spectra (1995)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: When trying to detect or quantify a signal at or near the limit of detectability, it is invariably embeded in the noise. This statement is true for nearly all detectors of any physical phenomena and the limit of detectability, hopefully, occurs at very low signal-to-noise levels. This is particularly true of IMS (Ion Mobility Spectrometers) spectra due to the low vapor pressure of several chemical compounds of great interest and the small currents associated with the ionic detection process. Gated Integrators and Boxcar Integrators or Averagers are designed to recover fast, repetitive analog signals. In a typical application, a time 'Gate' or 'Window' is generated, characterized by a set delay from a trigger or gate pulse and a certain width. A Gated Integrator amplifies and integrates the signal that is present during the time the gate is open, ignoring noise and interference that may be present at other times. Boxcar Integration refers to the practice of averaging the output of the Gated Integrator over many sweeps of the detector. Since any signal present during the gate will add linearly, while noise will add in a 'random walk' fashion as the square root of the number of sweeps, averaging N sweeps will improve the 'Signal-to-Noise Ratio' by a factor of the square root of N.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA. Johnson Space Center, Third International Workshop on Ion Mobility Spectrometry; p 281-296
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    The Hummingbird GC-IMS: In Situ Analysis of a Cometary Nucleus (2000)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: Comets are of enormous scientific interest for many reasons. They are primitive bodies that date back to the earliest stages of solar system formation and, because of their small size and because they have been stored in the outer reaches of the solar system, their pristine nature has been preserved better than for any other class of body. They are extremely rich in highly volatile elements, many in the form of ices, and are richer in organic matter than any other known solar system body. It is strongly suspected that in addition to their content of primordial solar nebular material, they also incorporate unprocessed matter from the interstellar medium. Impacts by comets occur onto all the planets and satellites, often with major consequences (e.g., the dinosaur extinction event at the KIT boundary), or sometimes just providing a spectacular cosmic event (e.g., the collision of comet Shoemaker-Levy 9 with Jupiter). A mission to analyze a cometary nucleus must be capable of detecting and identifying over 30 molecular species among several different chemical groups. The Hummingbird Mission will rendezvous with, orbit, characterize, and make multiple descents to the nucleus of a comet. Hummingbird will employ a Gas Chromatograph - Ion Mobility Spectrometer (GC-IMS) as part-of a suite of sophisticated instruments for a comprehensive in situ elemental, molecular, and isotopic analysis of the comet.
    Keywords: Astrophysics
    Type: 8th International Conference of On-Site Analysis; Jan 23, 2000 - Jan 26, 2000; Las Vegas, NV; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Microliter-sized ionization device and method (1999)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: A microliter-sized metastable ionization device with a cavity, a sample gas inlet, a corona gas inlet and a gas outlet. A first electrode has a hollow and disposed in the cavity and is in fluid communication with the sample gas inlet. A second electrode is in fluid communication with the corona gas inlet and is disposed around the first electrode adjacent the hollow end thereof. A gap forming means forms a corona gap between the first and second electrodes. A first power supply is connected to the first electrode and the second power supply is connected to the second electrode for generating a corona discharge across the corona gap. A collector has a hollow end portion disposed in the cavity which is in fluid communications with the gas outlet for the outgassing and detection of ionized gases. The first electrode can be a tubular member aligned concentrically with a cylindrical second electrode. The gap forming means can be in annular disc projecting radially inwardly from the cylindrical second electrode. The collector can have a tubular opening aligned coaxially with the first electrode and has an end face spaced a short distance from an end face of the first electrode forming a small active volume therebetween for the generation and detection of small quantities of trace analytes.
    Keywords: Atomic and Molecular Physics
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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