Microwave absorption by ortho-H2 pairs in solid hydrogen
Microwave absorption by ortho-H2 pairs in solid hydrogen
复制标题
固体氢中邻氢对的微波吸收
DOI：
10.1139/p77-154
复制
发表时间：
1977
影响因子：
1.2
通讯作者：
A. B. Harris
中科院分区：
文献类型：
--
作者：
W. Hardy;A. J. Berlinsky;A. B. Harris
本文报道了在10-26和60-90 GHz频率范围内，（J =0）固体氢中低浓度（J=1）H_2分子对的微波吸收谱的测量结果。 对系数为10 - 5 cm-1的光子的观测是通过一种新的量热方法完成的。 这些解释是由相邻的（J = 1）分子对的能级之间的跃迁引起的，并且基于选择规则、相对强度、温度依赖性和由于（J = 1）分子迁移引起的时间演化进行分配。 在1.2 K和0.2%的浓度（J = 1）物种的面内和面外最近邻对的聚类观察到的时间常数为100和10小时。 峰值频率、宽度和线形状以通常为5至50 MHz的分辨率来确定。 与本文提出的跃迁频率的理论表达式进行了比较，确定了几个各向异性势参数，并给出了计算结果。
Measurements of the microwave absorption spectrum of pairs of (J = 1) H2 molecules at low concentration in (J = 0) solid hydrogen in the frequency ranges 10–26 and 60–90 GHz are reported. Observation of absorptions with coefficients 10−5 cm−1 is accomplished by a novel calorimetric method. These absorptions result from transitions between energy levels of near neighboring pairs of (J = 1) molecules and assignments are made on the basis of selection rules, relative intensities, temperature dependences, and time evolution due to migration of (J = 1) molecules. Clustering of in-plane and of out-of-plane nearest neighbor pairs are observed to have time constants of 100 and 10 h, at 1.2 K and with 0.2% concentration of (J = 1) species. Peak frequencies, widths, and line shapes are determined with a resolution typically of order 5 to 50 MHz. Comparison is made to theoretical expressions for the transition frequencies, developed in the following paper, and several anisotropic potential parameters are determined,...