Line broadening mechanisms of the ortho-H2 pair spectrum
Line broadening mechanisms of the ortho-H2 pair spectrum
复制标题
邻位 H2 对光谱的谱线展宽机制
DOI：
10.1139/p80-173
复制
发表时间：
1980
影响因子：
1.2
通讯作者：
W. Hardy
中科院分区：
文献类型：
--
作者：
B. Statt;W. Hardy
研究了固体氢中邻位对光谱的三种展宽机制。首先，提出了声子引起的寿命展宽的理论预测。接下来发展了一种理论，该理论由于该对周围存在邻位分子而给出了不均匀展宽。一个意想不到的结果是某些线仍然没有展宽，至少在所得出的近似值内。还考虑了同位素质量缺陷杂质引起的应变效应。然后将这些预测与实验结果进行比较。没有观察到线形的温度依赖性，这为声子展宽对线宽的贡献设定了上限。这个限制比理论预测的要低一个数量级。另一方面，邻位展宽理论的预测与实验非常吻合。还研究了掺杂同位素杂质的样品。
Three broadening mechanisms for the ortho pair spectrum in solid hydrogen are investigated. First, theoretical predictions of the phonon induced lifetime broadening are presented. Next a theory is developed which gives the inhomogeneous broadening due to the presence of ortho molecules surrounding the pairs. An unexpected result is that certain lines remain unbroadened, at least to within the approximations made. Strain effects due to isotopic mass defect impurities are also considered. These predictions are then compared with experimental results. No temperature dependence of the lineshapes is observed, setting an upper limit on the phonon broadening contribution to the linewidth. This limit is an order of magnitude lower than the theory predicts. The predictions of the ortho broadening theory, on the other hand, are in good agreement with experiment. Samples doped with isotopic impurities are also investigated.