The fluorescence excitation spectrum of the ArI2 van der Waals complex
The fluorescence excitation spectrum of the ArI2 van der Waals complex
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ArI2范德华配合物的荧光激发光谱
DOI：
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发表时间：
1978
期刊：
影响因子：
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通讯作者：
D. Levy
中科院分区：
文献类型：
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作者：
G. Kubiak;Pamela S. H. Fitch;L. Wharton;D. Levy
在混合氩氦载气中对I2进行超声速膨胀制备了范德华分子ArI2，并对其荧光激发光谱进行了观察。当碘的拉伸振动激发到v ' ?时，才观察到配合物的光谱。12 .在兴奋吗？电子状态。在此值以上，范德华谱的强度是碘振动量子数的振荡函数。这种行为归因于激发态中两个衰变通道之间的竞争：截面随v ‘单调增加的振动预解离，截面随v ’振荡的电子预解离。谱线宽度为0-15跃迁中激发态的寿命提供了3×10−11秒的下限。
The van der Waals molecule ArI2 has been produced in a supersonic expansion of I2 in mixed argon–helium carrier gas, and its fluorescence excitation spectrum has been observed. Spectra of the complex are only observed when the iodine stretching vibration is exicted to v′?12 in the excited ? electronic state. Above this value the intensity of the van der Waals spectrum is observed to be an oscillatory function of the iodine vibrational quantum number. This behavior is attributed to competition between two decay channels in the excited state: vibrational predissociation with a cross section that increases monotonically with v′, and electronic predissociation with a cross section that oscillates with v′. The spectral linewidth provides a lower limit of 3×10−11 sec for the lifetime of the excited state involved in the 0–15 transition.