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Infrared Cavity Ringdown Laser Absorption Spectroscopy of jet -cooled clusters.

机译：射流冷却团簇的红外腔衰荡激光吸收光谱。

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摘要

Infrared Cavity Ringdown Laser Absorption Spectroscopy (IR-CRLAS) employing stimulated Raman scattering (SRS) of pulsed dye lasers as the tunable IR source has been developed. This technique allows highly sensitive (ca. 1 ppm fractional absorption) direct absorption measurements to be performed in the 2--8 mum spectral range with complete wavelength coverage. Basic CR-LAS principles and essential SRS theory are reviewed. IR-CRLAS spectrometers based on both a Raman shifted dye laser and a pulsed Alexandrite ring laser are described.;The IR-CRLAS spectrometer has been used in a comparative study of the O-H-stretching vibrations of small alcohol clusters. Results indicate an increase in the hydrogen bond strength as the alcohol chain length increases. An IR-CRLAS investigation of the aromatic C-H stretches of benzene and berizene/methane mixtures, performed in an effort to provide experimental support for a theoretically proposed "antihydrogen bond", produced negative results. Similarly, negative results from a visible CRLAS search for water cluster absorptions in connection with the anomalous atmospheric absorption of solar radiation are presented.;Infrared laser spectroscopic studies of the structures and bonding in jet-cooled carbon clusters are discussed. The measurement and analysis of a rovibrational band at 2074 cm-1, tentatively assigned to linear C10 is presented. The astrophysical significance of carbon clusters is also discussed in conjunction with the first detection of a non polar molecule (C3) in a cold interstellar dust forming region, performed using far-infrared heterodyne spectroscopy aboard the Kuiper Airborne Observatory.
机译：已经开发了利用脉冲染料激光的受激拉曼散射（SRS）作为可调红外源的红外腔衰荡激光吸收光谱法（IR-CRLAS）。该技术允许在2--8微米光谱范围内以完全的波长覆盖范围进行高灵敏度（约1 ppm的部分吸收）直接吸收测量。审查了基本的CR-LAS原理和基本的SRS理论。描述了一种基于拉曼位移染料激光和脉冲亚历山大环形激光的IR-CRLAS光谱仪。IR-CRLAS光谱仪已用于对小型酒精团簇的O-H拉伸振动进行比较研究。结果表明氢键强度随着醇链长度的增加而增加。为了为理论上提出的“抗氢键”提供实验支持而进行的IR-CRLAS研究苯和苯和甲烷/甲烷混合物的芳族C-H链段产生了负面结果。类似地，给出了与太阳辐射的异常大气吸收有关的可见CRLAS搜索水团吸收的负面结果。讨论了红外激光光谱研究射流冷却的碳团的结构和键合。介绍了暂定为线性C10的2074 cm-1旋转带的测量和分析。碳簇的天体意义还结合在柯伊伯航空天文台上使用远红外外差光谱法在寒冷的星际尘埃形成区域中首次检测到非极性分子（C3）进行了讨论。

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  • 作者

    Provencal, Robert Allen.;

  • 作者单位

    University of California, Berkeley.;

  • 授予单位 University of California, Berkeley.;
  • 学科 Chemistry Physical.;Physics Atmospheric Science.;Physics Radiation.
  • 学位 Ph.D.
  • 年度 1999
  • 页码 178 p.
  • 总页数 178
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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