Experimental determination of the lowest excited Xe2 molecular states from VUV absorption spectra
Experimental determination of the lowest excited Xe2 molecular states from VUV absorption spectra
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从 VUV 吸收光谱中确定 Xe2 最低激发态分子态的实验
DOI：
10.1063/1.441177
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发表时间：
1981
影响因子：
4.4
通讯作者：
M. Castex
中科院分区：
文献类型：
--
作者：
M. Castex
给出了两条第一共振线（1469.6和1295.6 A）翼中Xe 2对吸收随压力（P<760 Torr）和温度（130 K<T<300 K）变化的定量分析。使用准静态理论，吸收测量提供了有价值的信息上的最低的0 u+和1u激发态，0 g+基态电位从文献中已知。在近翼区（λ Δν λ <100 cm−1），线翼的形状被用作渐近的− 2C 3/R3−C60/R6（0 u+）和+C3/R3−C61/R6（1u）势的探针，假设在大R下振子强度恒定，C3和C6激发常数被确定。此外，吸收随温度的依赖性被用来导出关于上能级的额外信息，并且还证明了在较短的核间距（3.7 A <R<4.6 A）下跃迁矩的一些变化。将实验得到的势能曲线与从头计算的势能曲线进行了比较。
A quantitative analysis of absorption by Xe2 pairs in the wings of the two first resonant lines (1469.6 and 1295.6 A) is presented as a function of pressure (P<760 Torr) and temperature (130 K<T<300 K). Using a quasistatic theory, absorption measurements provide valuable information on the lowest 0u+ and 1u excited states, the 0g+ ground state potential being known from literature. In the near wing region (‖Δν‖<100 cm−1) the shape of the line wings is used as a probe of the asymptotic −2C3/R3−C60/R6 (0u+) and +C3/R3−C61/R6 (1u) potentials assuming at large R a constant oscillator strength, C3 and C6 excited constants are determined. Furthermore the dependence of absorption with temperature is used to derive additional information about the upper states and also to put in evidence some variation of transition moments, at shorter internuclear distances (3.7 A <R<4.6 A). The potential curves experimentally derived are compared with ab initio calculated curves.