Zero-point vibration of hydrogen adsorbed on Si and Pt surfaces.
Zero-point vibration of hydrogen adsorbed on Si and Pt surfaces.
复制标题
Si 和 Pt 表面吸附氢的零点振动。
DOI：
10.1103/physrevlett.88.116101
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发表时间：
2002
影响因子：
8.6
通讯作者：
M. Matsumoto
中科院分区：
文献类型：
--
作者：
K. Fukutani;A. Itoh;M. Wilde;M. Matsumoto
使用 1H(15N,alphagamma)12C 通过核反应分析 (NRA) 研究吸附在 Si(111) 和 Pt(111) 上的氢原子。通过对法向和倾斜离子入射的 NRA 谱的测量，发现 Si(111) 上 H 在垂直和平行方向上的零点振动能量分别为 123.4+/-4.6 和 44.6+/-6.2 meV，这与谐波势一致。 Pt(111)-H 获得的垂直和平行方向的零点能量分别为 80.8+/-3.9 和 62.1+/-6.0 meV。这些结果表明拉伸模式是谐波的，而弯曲模式是强非谐波的。
Hydrogen atoms adsorbed on Si(111) and Pt(111) were investigated by nuclear reaction analysis (NRA) using 1H(15N,alphagamma)12C. From measurements of the NRA spectrum at normal and tilted ion incidences the zero-point vibrational energies of H on Si(111) in the perpendicular and parallel directions were found to be 123.4+/-4.6 and 44.6+/-6.2 meV, respectively, which are consistent with harmonic potentials. The zero-point energies obtained for Pt(111)-H were 80.8+/-3.9 and 62.1+/-6.0 meV for perpendicular and parallel directions, respectively. These results indicate that the stretching mode is harmonic, while the bending mode is strongly anharmonic.