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Pure Appl. Chem.
75(7), 975-998, 2003
Pure and Applied
Vol. 75, Issue 7
COMMISSION ON SPECTROCHEMICAL AND OTHER OPTICAL PROCEDURES FOR ANALYSIS
Critical assessment: Use of supersonic jet spectrometry for complex
mixture analysis (IUPAC Technical Report)
D. S. Moore, and T. Vo-Dinh
Abstract: When cooled to a temperature of a few K using supersonic
jet expansion into a vacuum, a molecule exists in the lowest vibrational
level of the ground electronic state and is isolated at collision-free
conditions. The absorption or excitation/fluorescence spectrum is then
greatly simplified, when transitions occur from this single vibrational
level to a limited number of vibrational levels in the excited electronic
state. This method, called supersonic jet spectrometry, is a powerful
analytical technique because of its high selectivity, since the chemical
species can be accurately identified and selectively quantified using
the sharp spectral features even for large molecules. Supersonic jet
spectrometry has distinct advantages over other low-temperature spectrometries,in
that it can be combined with gas-phase separation and detection techniques
such as chromatography or mass spectrometry. Therefore, this spectrometric
technique can be used as a versatile analytical means, not only for
basic research on pure substances, but also for practical trace analysis
of chemical species in multicomponent samples (e.g., in biological monitoring
or in environmental monitoring).
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