环境对电子束激发高密度Ar-Ar混合气体中双$_{2}^{*}$分子IR荧光的影响
Environment influence on the IR fluorescence of Xe$_{2}^{*}$ molecules in electron beam excited Ar--Xe mixture at high density
摘要：
本文报道了室温下电子束激发的Ar（90%）-Ar（10%）混合气体中近红外（NIR）双$_2^*$准分子荧光的新测量结果.以前的测量密度高达$N\approx 2\times 10^{26}$ m $^{-3}$，发现在$\approx 7800$ cm $^{-1},$处有一个宽的受激准分子荧光带，其中心因增加$N$而红移（A. F. Borghesani，G.布雷西湾Carugno，E. Conti和D. Iannuzzi，{ \em J. Chem. Phys.}，{ \bf 115}，6042（2001））。通过假设分子中的光学活性电子的能量被密度依赖的费米位移和由于环境引起的溶剂化效应所移动，解释了这种移动。我们已经扩展了密度范围高达$N\approx 6\times 10^{26}$ m $^{-3}, $确认以前的测量和扩展的解释模型的有效性。的荧光带的宽度的详细分析给出了一个值为2.85 nm的大小的调查准分子状态。如此大的数值使我们相信对实验结果所作的解释是正确的。
英文摘要：
We report new measurements of the near infrared (NIR) Xe$_2^*$ excimer fluorescence in an electron--beam--excited Ar (90%)--Xe (10 %) mixture at room temperature. Previous measurements up to a density $N\approx 2\times 10^{26}$ m$^{-3}$ discovered a broad excimer fluorescence band at $\approx 7800$ cm$^{-1},$ whose center is red--shifted by increasing $N$ (A. F. Borghesani, G. Bressi, G. Carugno, E. Conti, and D. Iannuzzi, {\em J. Chem. Phys.}, {\bf 115}, 6042 (2001)). The shift has been explained by assuming that the energy of the optical active electron in the molecule is shifted by the density--dependent Fermi shift and by accounting for the solvation effect due to the environment. We have extended the density range up to $N\approx 6\times 10^{26}$ m$^{-3}, $ confirming the previous measurements and extending the validity of the interpretative model. A detailed analysis of the width of the fluorescence band gives a value of 2.85 nm for the size of the investigated excimer state. Such a large value lends credence to the validity of the proposed explanation of the experimental findings.
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