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Proceedings Paper

Infrared degenerate four-wave mixing and resonance-enhanced stimulated Raman scattering in small molecules
Author(s): Dirk Voelkel; J. Marques; Friedrich Huisken; Yu. L. Chuzavkov; S. N. Orlov; Yu. N. Polivanov; V. V. Smirnov
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Paper Abstract

Infrared degenerate four-wave mixing spectroscopy (IR-DFWM) has been employed to study the molecules acetylene (C2H2), ammonia (NH3), methane (CH4), carbon dioxide (CO2), and nitrous oxide (N2O) in a cell under equilibrium conditions and cooled in free jet expansions. For methane at room temperature the detection limit was 2 X 1012 molecules per cm3 and quantum state, enabling the detection of trace species with a spatial resolution of 1 mm2 X 30 mm. In an attempt to study transitions in the v1 + v3 and 2v2 + v3 combination bands of CO2 or N2O, it was not possible to observe any DFWM signal. Instead a surprisingly strong, backward and forward directed emission was found which could not be attributed to the DFWM process. Our investigations lead to the conclusion that the emission can be explained by stimulated Raman scattering, resonantly enhanced by transitions to the combination levels v1 + v3 and 2v2 + v3. This process seems to suppress the generation of DFWM signal.

Paper Details

Date Published: 5 February 1999
PDF: 8 pages
Proc. SPIE 3732, ICONO '98: Laser Spectroscopy and Optical Diagnostics: Novel Trends and Applications in Laser Chemistry, Biophysics, and Biomedicine, (5 February 1999); doi: 10.1117/12.339994
Show Author Affiliations
Dirk Voelkel, Max-Planck-Institut fuer Stroemungsforschung (Germany)
J. Marques, Max-Planck-Institut fuer Stroemungsforschung (Germany)
Friedrich Huisken, Max-Planck-Institut fuer Stroemungsforschung (Germany)
Yu. L. Chuzavkov, General Physics Institute (Russia)
S. N. Orlov, General Physics Institute (Russia)
Yu. N. Polivanov, General Physics Institute (Russia)
V. V. Smirnov, General Physics Institute (Russia)


Published in SPIE Proceedings Vol. 3732:
ICONO '98: Laser Spectroscopy and Optical Diagnostics: Novel Trends and Applications in Laser Chemistry, Biophysics, and Biomedicine
Andrey Yuri Chikishev; Victor N. Zadkov; Alexei M. Zheltikov, Editor(s)

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