منابع مشابه
Proton-transfer reaction mass spectrometry.
Proton-transfer reaction mass spectrometry (PTR-MS) is a technique developed almost exclusively for the detection of gaseous organic compounds in air. Volatile organic compounds (VOCs) in air have both natural and anthropogenic sources. Natural sources include the emission of organic gases by living objects, both plants and animals. A well-known example, which is discussed later in this review,...
متن کاملCorrected equation for the concentrations in the drift tube of a proton transfer reaction-mass spectrometer (PTR-MS)
A corrected equation for the concentrations in the drift tube of a proton transfer reaction-mass spectrometer (PTR-MS) is presented which ccounts for the different mobility of primary ions and protonated analyte volatile organic compounds (VOCs). As a consequence, the calculation f VOC concentrations from the measured count rates requires as well a correction factor, equalling the ratio of (i) ...
متن کاملProton transfer reaction-mass spectrometry applications in medical research.
Gathering information about a subject's physiological and pathophysiological condition from the `smell' of breath is an idea that dates back to antiquity. This intriguing concept of non-invasive diagnosis has been revitalized by `exhaled breath analysis' in recent decades. A main driving force was the development of sensitive and versatile gas-chromatographic and mass-spectrometric instruments ...
متن کاملThe H1 Forward Proton Spectrometer at HERA
The forward proton spectrometer is part of the H1 detector at the HERA collider. Protons with energies above 500 GeV and polar angles below 1 mrad can be detected by this spectrometer. The main detector components are scintillating fiber detectors read out by position-sensitive photo-multipliers. These detectors are housed in so-called Roman Pots which allow them to be moved close to the circul...
متن کاملMacromolecular ion accelerator mass spectrometer.
We present a newly developed macromolecular ion accelerator mass spectrometer that combines a dual-ion-trap device and a macromolecular ion accelerator (MIA) to achieve the capability of analyzing samples with a mixture of large biomolecules. MIA greatly increases detection efficiency. The dual ion trap includes a quadrupole ion trap (QIT) and a linear ion trap (LIT) in tandem. The dual ion tra...
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ژورنال
عنوان ژورنال: Europhysics News
سال: 2004
ISSN: 0531-7479,1432-1092
DOI: 10.1051/epn:2004606