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First-principles C band absorption spectra of SO2 and its isotopologues

机译:SO2的第一原理C带吸收光谱及其同位素

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The low-energy wing of the (C) over tilde B-1(2) <- (X) over tilde (1)A(1) absorption spectra for SO2 in the ultraviolet region is computed for the S-32, S-33, S-34 and S-36 isotopes, using the recently developed ab initio potential energy surfaces (PESs) of the two electronic states and the corresponding transition dipole surface. The state-resolved absorption spectra from various ro-vibrational states of SO2((X) over tilde (1)A(1)) are computed. When contributions of these excited ro-vibrational states are included, the thermally averaged spectra are broadened but maintain their key characters. Excellent agreement with experimental absorption spectra is found, validating the accuracy of the PESs. The isotope shifts of the absorption peaks are found to increase linearly with energy, in good agreement with experiment. Published by AIP Publishing.
机译:在紫外线区域中的紫外线(1)A(1)在紫外区域中的SO2上的Tilde B-1(x)的(c)的低能量翼被用于S-32,S- 33,S-34和S-36同位素,使用最近开发的AB初始电位能量表面(PES)的两个电子状态和相应的过渡偶极表面。 计算来自SO2((x)上的各种RO振动状态的状态分辨吸收光谱(1)A(1))。 当包括这些兴奋的RO振动状态的贡献时,热平均光谱宽阔,但保持其关键字。 找到了与实验吸收光谱的良好协议,验证了PES的准确性。 发现吸收峰的同位素偏移与实验吻合良好的能量线性增加。 通过AIP发布发布。

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