SYNCHROTRON INFRARED-SPECTROSCOPY AT MEGABAR PRESSURES - VIBRATIONAL DYNAMICS OF HYDROGEN TO 180 GPA

被引：76
作者：
HANFLAND, M
HEMLEY, RJ
MAO, HK
WILLIAMS, GP
机构：
[1] CARNEGIE INST WASHINGTON,CTR HIGH PRESSURE RES,WASHINGTON,DC 20015
[2] BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973
来源：
PHYSICAL REVIEW LETTERS | 1992年 / 69卷 / 07期
关键词：
D O I：
10.1103/PhysRevLett.69.1129
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We have developed new techniques for measuring infrared spectra at megabar pressures using synchrotron radiation and applied them to study the Q1(1), Q1(1) + S1(0), and Q(R)(J) vibrational transitions of solid hydrogen to 180 GPa. The frequency difference between the Q1(1) infrared and Raman vibrons increases from 3 cm-1 (zero pressure) to 510 cm -1 (180 GPa), indicating a dramatic increase in intermolecular coupling with pressure. A negative frequency shift is observed for the infrared vibron above 140 GPa. A significant increase in frequency and LO-TO splitting of the lattice phonon is also documented.
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页码：1129 / 1132
页数：4
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