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首页> 外文期刊>The Journal of Chemical Physics >VIBRATIONAL HYPERPOLARIZABILITIES AND THE KERR EFFECT IN CH4, CF4, AND SF6
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VIBRATIONAL HYPERPOLARIZABILITIES AND THE KERR EFFECT IN CH4, CF4, AND SF6

机译：CH4，CF4和SF6中的振动超极化和Kerr效应

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The hyperpolarizabilities gamma of CH4, CF4, and SF6 were measured by the dc Kerr effect at wavelengths from 457.9 to 1092 nm. Vibrational hyperpolarizabilities gamma(nu) were obtained by combining these measurements with electric-field-induced second harmonic generation (ESHG) measurements. The vibrational contribution to the hyperpolarizability ranges from 6% to 35% of the total. At high optical frequency the difference between gamma(nu) for Kerr and gamma(nu) for ESHG is approximately constant, and has values 18, 31, and 51 x 10(-63) C-4 m(4) J(-3) for CH4, CF4, and SF6, respectively. The experimental results are in good quantitative agreement with the results of recent ab initio calculations of the frequency dependence of gamma(nu) for CH4, except for a small but non-negligible discrepancy at high frequency. (C) 1996 American Institute of Physics. [References: 23]
机译：CH4，CF4和SF6的超极化率γ是通过直流Kerr效应在457.9至1092 nm的波长下测量的。通过将这些测量值与电场感应的二次谐波产生（ESHG）测量值相结合，获得了振动超极化率γ（nu）。振动对超极化率的贡献范围为总数的6％至35％。在高光频率下，克尔的γ（nu）和ESHG的γ（nu）之间的差值近似恒定，并且具有18、31和51 x 10（-63）C-4 m（4）J（-3）的值）分别用于CH4，CF4和SF6。实验结果与最近的从头算对CH4的频率依赖性的从头算的结果良好的定量吻合，除了高频处的很小但不可忽略的差异外。 （C）1996年美国物理研究所。 [参考：23]

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