Montgomery G P
Appl Opt. 1978 Aug 1;17(15):2299-303. doi: 10.1364/AO.17.002299.
Infrared absorption by the water vapor continuum near 1200 cm(-1) has been measured with a lead-tin-telluride diode laser over a 40.5-m optical path. The measurements were made as a function of temperature from 333 K to 473 K; thus, they overlap and extend previous measurements made at temperatures between 293 K and 388 K. Over the entire temperature range studied here, the continuum extinction coefficient increases quadratically with water-vapor partial pressure as expected for the relatively high partial pressures used in these measurements. At temperatures below 398 K. our measured extinction coefficients agree well with previously reported data. At higher temperatures, however, the extinction coefficient is almost independent of temperature and is substantially larger than predicted by empirical formulas. Values of the self-broadening coefficient for water vapor have been extracted from the experimental data, and a possible interpretation of the results involving both dimer and line-broadening effects is presented.
利用铅锡碲化物二极管激光器在40.5米的光程上测量了1200厘米⁻¹附近水汽连续体的红外吸收。测量是在333K至473K的温度范围内进行的；因此，它们与先前在293K至388K温度下进行的测量重叠并加以扩展。在本文研究的整个温度范围内，连续体消光系数随水汽分压呈二次方增加，这与这些测量中使用的相对较高的分压情况预期相符。在398K以下的温度下，我们测得的消光系数与先前报道的数据吻合良好。然而，在较高温度下，消光系数几乎与温度无关，且远大于经验公式的预测值。已从实验数据中提取了水汽的自展宽系数值，并给出了一个涉及二聚体和谱线展宽效应的结果合理解释。
