The dispersion curves of the three phonon modes of xenon, krypton, and argon monolayers on the Pt(111) surface

被引:47
作者
Bruch, LW
Graham, AP
Toennies, JP
机构
[1] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA
[2] Max Planck Inst Stromungsforsch, D-37073 Gottingen, Germany
关键词
D O I
10.1063/1.480914
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The dispersion curves of all three phonon modes, the shear horizontal (SH), longitudinal (LA), and perpendicular (S) vibrations of the two-dimensional monolayer inert gas solids of xenon, krypton, and argon on Pt(111) have been measured by inelastic helium atom scattering (HAS). Previous HAS measurements of xenon on other substrates revealed, in addition to the S mode, only a single dispersive mode which deviated strongly from the expected behavior of the LA branch, to which it had been assigned. The new measurements now identify this mode as the SH mode and all three modes are in excellent agreement with calculations based on the inert gas pair potentials determined from gas and bulk solid data. Possible mechanisms for the excitation of the SH branch, which should couple only very weakly to HAS on the basis of symmetry considerations, are discussed. (C) 2000 American Institute of Physics. [S0021-9606(00)70104-8].
引用
收藏
页码:3314 / 3332
页数:19
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