Precise measurement of pressure broadening parameters for water vapor with a terahertz time-domain spectrometer

详细信息	查看全文 | 推荐本文 |

• 作者：Hiromichi Hoshina ; Takamasa Seta ; Toshiyuki Iwamoto ; Iwao Hosako ; Chiko Otani ; Yasuko Kasai
• 关键词：Terahertz ; THz-TDS ; Gas-phase spectroscopy ; Water vapor ; Pressure broadening parameter
• 刊名：Journal of Quantitative Spectroscopy and Radiative Transfer
• 出版年：2008
• 期刊代码：70_00224073
• 类别：ch
• 出版时间：August-September 2008
• 卷：109
• 期：12-13
• 页码：2303-2314
• 文件大小：487 K

摘要

The pressure broadening parameters γ_N2 and γ_O2of pure rotational transitions of water vapor with nitrogen and oxygen as foreign gases, respectively, were measured with a terahertz time-domain spectrometer (THz-TDS) in the frequency region from 0.5 to 3.5 THz. A White-type multi-pass cell was introduced in the THz-TDS system to precisely measure the absorption spectra of water vapor. The parameters of 36 lines were determined for both N₂ and O₂, of which 25 parameters for γ_N2and 28 parameters for γ_O2were the first laboratory experimental data. The quantum number dependence of the parameters was experimentally observed for the first time due to the good signal-to-noise ratio of this system compared with the conventional Fourier transform infrared spectrometer (FT-IR) experiments.