Electronic spectroscopy in He droplets
Electronic spectroscopy in He droplets
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He 液滴中的电子光谱
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
A. Vilesov
中科院分区：
文献类型：
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作者：
F. Stienkemeier;A. Vilesov
综述了近年来镶嵌在氦纳米液滴中的原子、团簇和有机分子的电子能谱实验。与振动和旋转激发相比，电子跃迁意味着氦环境的扭曲程度更大。因此出现了新的现象，如由于氦集体振动的激发而在光谱中出现边带，分子的有效转动常数发生了很大的变化，甚至原子(或分子)在激发时被逐出团簇。这些特征使得在原子尺度上探测氦环境及其与分子生色团的相互作用成为可能。通过飞秒激发技术实时研究液滴中的超流现象和化学过程，为这一领域提供了一个新的视角。到目前为止可获得的大量数据表明，氦液滴在大分子分离和光谱研究方面具有巨大的潜力。
Recent experiments on the electronic spectroscopy of atoms, clusters, and organic molecules embedded in helium nanodroplets are reviewed. Electronic transitions imply a larger degree of distortion of the helium environment as compared to vibrational and rotational excitations. Thus new phenomena arise such as the appearance of side bands in the spectra, which are due to the excitation of helium collective vibrations, large changes of the effective molecular rotational constants and even the expulsion of an atom (or molecule) from the cluster upon excitation. These features make it possible to probe the helium environment and its interactions with molecular chromophores on the atomic scale. Real-time studies of the manifestations of superfluidity and of chemical processes in the droplets via femtosecond excitation techniques, provide a new perspective to this field. The considerable amount of data available so far shows the large potential of helium droplets for isolation and spectroscopy of large molecule...