Godon M, Bauer A, Gamache RR
Laboratoire de Physique des Lasers, Atomes et Molécules, UMR CNRS, Université des Sciences et Technologies de Lille, CERLA, Villeneuve d'Ascq Cedex, 59655, France
J Mol Spectrosc. 2000 Aug;202(2):293-302. doi: 10.1006/jmsp.2000.8143.
In the aim of achieving a better understanding of the molecular mechanisms involved in the absorption continuum of the water-vapor rotational spectrum, various H(2)O-X mixtures are investigated in an atmospheric window in the mmw range. In the present study, the X mixing gas is methane. Absolute absorption rates have been measured at 239 GHz. The dependence on pressure as well as temperature has been obtained. The experimental data are compared with models using conventional line profiles. As these models require the knowledge of the collisional half-widths of H(2)O broadened by CH(4), theoretical calculations using the complex Robert-Bonamy formalism have been carried out. A "continuum effect" is observed when comparing the experimental absorption with the models, as well as for the magnitude of the absorption discrepancy and for the strong temperature dependence of this absorption. The effect is compared for various X mixing gases to the collisional broadening efficiency in the impact approximation. Copyright 2000 Academic Press.
为了更好地理解水汽旋转光谱吸收连续区所涉及的分子机制，在毫米波范围内的一个大气窗口中对各种H₂O - X混合物进行了研究。在本研究中，X混合气体为甲烷。已在239GHz下测量了绝对吸收率。得到了吸收率对压力和温度的依赖关系。将实验数据与使用传统谱线轮廓的模型进行了比较。由于这些模型需要知道由CH₄加宽的H₂O的碰撞半高宽，因此使用复杂的罗伯特 - 博纳米形式进行了理论计算。在将实验吸收与模型进行比较时，以及对于吸收差异的大小和该吸收的强烈温度依赖性，都观察到了一种“连续效应”。将各种X混合气体的这种效应与碰撞近似中的碰撞加宽效率进行了比较。版权所有2000年学术出版社。
