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首页> 外文会议>ICONO '98: Laser Spectroscopy and Optical Diagnostics: Novel Trends and Applications in Laser Chemistry, Biophysics, and Biomedicine >Infrared degenerate four-wave mixing and resonance-enhanced stimulated Raman scattering in small molecules
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Infrared degenerate four-wave mixing and resonance-enhanced stimulated Raman scattering in small molecules

机译：红外简并四波混频和共振增强的小分子拉曼散射

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Abstract: Infrared degenerate four-wave mixing spectroscopy (IR-DFWM) has been employed to study the molecules acetylene (C$-2$/H$- 2$/), ammonia (NH$-3$/), methane (CH$-4$/), carbon dioxide (CO$-2$/), and nitrous oxide (N$-2$/O) in a cell under equilibrium conditions and cooled in free jet expansions. For methane at room temperature the detection limit was 2 $MUL 10$+12$/ molecules per cm$+3$/ and quantum state, enabling the detection of trace species with a spatial resolution of 1 mm$+2$/ $MUL 30 mm. In an attempt to study transitions in the v$-1$/ $PLU v$-3$/ and 2v$-2$/ $PLU v$-3$/ combination bands of CO$-2$/ or N$-2$/O, it was not possible to observe any DFWM signal. Instead a surprisingly strong, backward and forward directed emission was found which could not be attributed to the DFWM process. Our investigations lead to the conclusion that the emission can be explained by stimulated Raman scattering, resonantly enhanced by transitions to the combination levels v$-1$/ $PLU v$-3$/ and 2v$-2$/ $PLU v$-3$/. This process seems to suppress the generation of DFWM signal. !28
机译：摘要：红外简并四波混合光谱法（IR-DFWM）用于研究乙炔（C $ -2 $ / H $ -2 $ /），氨（NH $ -3 $ /），甲烷（CH）的分子$ -4 $ /），二氧化碳（CO $ -2 $ /）和一氧化二氮（N $ -2 $ / O）在平衡条件下的电池中，并在自由射流膨胀中冷却。对于室温下的甲烷，检出限为2 $ MUL 10 $ + 12 $ /分子/ cm $ + 3 $ /和量子态，从而能够检测空间分辨率为1 mm $ + 2 $ / $ MUL的微量物质30毫米为了研究v $ -1 $ / $ PLU v $ -3 $ /和2v $ -2 $ / $ PLU v $ -3 $ / CO $ -2 $ /或N $- 2 $ / O，无法观察到任何DFWM信号。取而代之的是，发现了出乎意料的强烈，向后和向前的发射，这不能归因于DFWM过程。我们的研究得出的结论是，发射可以通过受激拉曼散射来解释，通过转换到组合水平v $ -1 $ / $ PLU v $ -3 $ /和2v $ -2 $ / $ PLU v $共振增强-3 $ /。这个过程似乎抑制了DFWM信号的产生。 ！28

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