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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >ABSORPTION COEFFICIENTS OF CLONO2 AT 780 CM(-1)
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ABSORPTION COEFFICIENTS OF CLONO2 AT 780 CM(-1)

机译：780 CM（-1）时CLONO2的吸收系数

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The absorption coefficients of the Q branch of the nu(4) band of ClONO2 at 780 cm(-1) have been measured over a sample pressure range of 0.1 to 0.4 torr using a tuneable diode laser spectrometer. The peak absorption coefficients derived from these measurements are 1.98(42) x 10(-18) cm(2) mol(-1) at 296 K, and 2.98(47) x 10(-18) cm(2) mol(-1) at 210 K. These are in good agreement with those determined previously by Fourier transform spectroscopy once corrections for the resolution of the instruments are made. Band contour analysis of the nu(4) + nu(6) - nu(6) and nu(4) + 2 nu(9)- 2 nu(9) bands of (ClONO2)-Cl-35 has been carried out and the results incorporated in the fitting of the observed spectrum. At 213 K the integrated intensity of the theoretical spectrum calculated for the range of identified bands is 6.4 x 10(-18) cm(-1) mol(-1). The derived integrated intensity of this whole band system is 8.6 x 10(-18) cm(-1) mol(-1), assuming all transition moments of the contributing bands are identical. For the 296 K spectrum of the nu(4) system a value of 3.9 x 10(-18) cm(-1) mol(-1) is obtained, with a value of 8.4 x 10(-18) cm(-1) mol(-1) if all populated states are included. The differences between the integrated intensities of the theoretical spectrum and of the band system are associated with the ''continuum'' contributed by the large number of weak bands associated with thermally populated states. The values obtained for the band systems may be compared with those derived by Ballard et al.[1988] over the range 750 to 830 cm(-1) for the entire nu(3)u(4) system, and by Davidson et al.[1987] over the range 750 to 791 cm(-1). These were 2.09 x 10(-17) cm(-1) mol(-1) at 213 K and 3.04 x 10(-17) cm(-1) mol(-1) at 296 K for the entire nu(3)u(4) system, and 8.1 x 10(-18) cm(-1) mol(-1) at 223 K and 12.9 x 10(-18) cm(-1) mol(-1) at 296 K. [References: 20]
机译：已使用可调二极管激光光谱仪在0.1至0.4托的样品压力范围内测量了780 cm（-1）处ClONO2的nu（4）谱带的Q分支的Q吸收系数。从这些测量得出的峰值吸收系数在296 K时为1.98（42）x 10（-18）cm（2）mol（-1）和2.98（47）x 10（-18）cm（2）mol（- 1）在210K。一旦对仪器的分辨率进行了校正，这些与先前通过傅立叶变换光谱法确定的结果就很好地吻合了。 （ClONO2）-Cl-35的nu（4）+ nu（6）-nu（6）和nu（4）+ 2 nu（9）-2 nu（9）谱带的谱带轮廓分析已经完成，并且将结果合并到观测光谱的拟合中。在213 K时，为确定的谱带范围计算的理论光谱的综合强度为6.4 x 10（-18）cm（-1）mol（-1）。假定贡献谱带的所有跃迁矩均相同，则此整个谱带系统的综合强度为8.6 x 10（-18）cm（-1）mol（-1）。对于nu（4）系统的296 K光谱，获得的值为3.9 x 10（-18）cm（-1）mol（-1），值为8.4 x 10（-18）cm（-1） ）mol（-1）（如果包括所有填充状态）。理论光谱和谱带系统的积分强度之间的差异与“连续谱”有关，“谱连续谱”是由与热填充状态相关的大量弱谱带引起的。可以将频带系统获得的值与Ballard等人[1988]得出的值进行比较。对于整个nu（3）/ nu（4）系统，范围为750至830 cm（-1），并且由Davidson等人[1987]在750至791 cm（-1）的范围内。对于整个nu（3），它们在213 K时为2.09 x 10（-17）cm（-1）mol（-1），在296 K时为3.04 x 10（-17）cm（-1）mol（-1） / nu（4）系统，在223 K时为8.1 x 10（-18）cm（-1）mol（-1），在296 K时为12.9 x 10（-18）cm（-1）mol（-1）。 [参考：20]

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