MECHANISM FOR 2-ROTON RAMAN SCATTERING FROM LIQUID HELIUM

被引:41
作者
HALLEY, JW
机构
[1] Department of Physics, University of California, Berkeley
[2] School of Physics and Astronomy, University of Minnesota, Minneapolis, MN
来源
PHYSICAL REVIEW | 1969年 / 181卷 / 01期
关键词
D O I
10.1103/PhysRev.181.338
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We study couplings between the phonon-roton excitations of liquid helium and an electromagnetic field. By including the electronic excitations of the helium atoms as intermediate states, we find a second-order two-roton Raman scattering amplitude which may be large enough to be observable. The roton scattering cross section as a function of energy transfer is calculated from the experimentally known roton spectrum and the pair-correlation function. The lowest-order infrared-absorption process involves (qa)2 and the quadrupole-dipole interaction and is too small to be observed. © 1969 The American Physical Society.
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页码:338 / &
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