Infrared degenerate four-wave mixing and resonance-enhanced stimulated Raman scattering in small molecules

Dirk Voelkel; J. Marques; Friedrich Huisken; Yu. L. Chuzavkov; S. N. Orlov; Yu. N. Polivanov; V. V. Smirnov

doi:10.1117/12.339994

5 February 1999 Infrared degenerate four-wave mixing and resonance-enhanced stimulated Raman scattering in small molecules

Dirk Voelkel, J. Marques, Friedrich Huisken, Yu. L. Chuzavkov, S. N. Orlov, Yu. N. Polivanov, V. V. Smirnov

Author Affiliations +

Proceedings Volume 3732, ICONO '98: Laser Spectroscopy and Optical Diagnostics: Novel Trends and Applications in Laser Chemistry, Biophysics, and Biomedicine; (1999) https://doi.org/10.1117/12.339994
Event: ICONO '98: Laser Spectroscopy and Optical Diagnostics: Novel Trends and Applications in Laser Chemistry, Biophysics, and Biomedicine, 1998, Moscow, Russian Federation

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.

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Dirk Voelkel, J. Marques, Friedrich Huisken, Yu. L. Chuzavkov, S. N. Orlov, Yu. N. Polivanov, and V. V. Smirnov "Infrared degenerate four-wave mixing and resonance-enhanced stimulated Raman scattering in small molecules", Proc. SPIE 3732, ICONO '98: Laser Spectroscopy and Optical Diagnostics: Novel Trends and Applications in Laser Chemistry, Biophysics, and Biomedicine, (5 February 1999); https://doi.org/10.1117/12.339994

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KEYWORDS

Molecules

Raman scattering

Infrared radiation

Absorption

Four wave mixing

Signal detection

Methane

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