Multiplex spectroscopy: Determining the transition moments and absolute concentrations of molecular species

Journal Article · Fri Jun 17 04:00:00 UTC 1994 · Science (Washington, D.C.); (United States)

DOI:https://doi.org/10.1126/science.264.5166.1750· OSTI ID:6799220

Germann, G J; Rakestraw, D J ^[1]

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1. Sandia National Labs., Livermore, CA (United States)

A procedure is described that uses two spectroscopic techniques, absorption and infrared degenerate four-wave mixing, in tandem (multiplex) to measure the transition dipole moments and absolute concentrations of molecular species in situ. The method is demonstrated by the measurement of the relative transition moments and concentrations of two dissimilar sample gas components, hydrogen chloride and nitrogen dioxide, but is applicable to a wide variety of molecules and, thus, can provide new information for transient molecular species. Further, difficulties in obtaining quantitative information through techniques such as laser-induced fluorescence, coherent anti-Stokes Raman scattering, and degenerate four-wave mixing spectroscopies can be overcome when a multiplex approach is used.

• OSTI ID: 6799220
• Journal Information: Science (Washington, D.C.); (United States), Journal Name: Science (Washington, D.C.); (United States) Journal Issue: 5166 Vol. 264:5166; ISSN SCIEAS; ISSN 0036-8075
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102* -- Chemical & Spectral Procedures
ABSORPTION SPECTROSCOPY
ABUNDANCE
DIPOLE MOMENTS
FREQUENCY MIXING
INFRARED SPECTRA
MOLECULES
SPECTRA
SPECTROSCOPY