Electronic State Spectroscopy of Halothane As Studied by ab Initio Calculations, Vacuum Ultraviolet Synchrotron Radiation, and Electron Scattering Methods.

Electronic State Spectroscopy of Halothane As Studied by ab Initio Calculations, Vacuum Ultraviolet Synchrotron Radiation, and Electron Scattering Methods.
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通过从头计算、真空紫外同步辐射和电子散射方法研究氟烷的电子态光谱。

DOI:
10.1021/acs.jpca.5b05308
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发表时间:
2015
期刊:
The journal of physical chemistry. A
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通讯作者:
Da Silva FF
Da Silva FF
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--
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作者:
Da Silva FF

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我们提出了第一套从头计算(垂直能量和振子强度)的麻醉剂化合物氟烷(CF 3CHBrCl)的价和里德伯跃迁。这些结果是由高分辨率的真空紫外光吸收测量在波长范围115-310 nm(10.8-4.0 eV)的补充。光谱揭示了一些以前文献中没有报道的新特征。在最低能级的计算中考虑了自旋-轨道效应,使我们能够解释σ*(C-Br)<$nBrand σ*(C-Cl)<$nCl跃迁的6.1和7.5 eV吸收带的宽性质。新的绝对光吸收截面从电子散射数据推导出在4.0-40.0 eV的范围内。用测得的绝对光吸收截面计算了氟烷在平流层上部(20-50公里)的光解寿命。
We present the first set of ab initio calculations (vertical energies and oscillator strengths) of the valence and Rydberg transitions of the anaesthetic compound halothane (CF3CHBrCl). These results are complemented by high-resolution vacuum ultraviolet photoabsorption measurements over the wavelength range 115–310 nm (10.8–4.0 eV). The spectrum reveals several new features that were not previously reported in the literature. Spin–orbit effects have been considered in the calculations for the lowest-lying states, allowing us to explain the broad nature of the 6.1 and 7.5 eV absorption bands assigned to σ*(C–Br) ← nBrand σ*(C–Cl) ← nCltransitions. Novel absolute photoabsorption cross sections from electron scattering data were derived in the 4.0–40.0 eV range. The measured absolute photoabsorption cross sections have been used to calculate the photolysis lifetime of halothane in the upper stratosphere (20–50 km).
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