Rahinov Igor, Cooper Russell, Yuan Cheng, Yang Xueming, Auerbach Daniel J, Wodtke Alec M
Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, USA.
J Chem Phys. 2008 Dec 7;129(21):214708. doi: 10.1063/1.3028542.
We report high resolution state-to-state time-of-flight (TOF) measurements for scattering of HCl(v=2, J=1) from a Au(111) single crystal surface for both vibrationally elastic (v=2-->2) as well as inelastic (v=2-->1) channels at seven incidence energies between 0.28 and 1.27 eV. The dependences of the TOF results on final HCl rotational state and surface temperature are also reported. The translational energy transferred to the surface depends linearly on incidence energy and is close to the single surface-atom impulse (Baule) limit over the entire range of incidence energies studied. The probability of vibrational relaxation is also large. For molecules that relax from v=2 to v=1, the fraction of vibrational energy that is transferred to the surface is approximately 74%. We discuss these observations in terms of an impulse approximation as well as the possible role of translational and vibrational excitations of electron-hole pairs in the solid.
我们报告了在0.28至1.27 eV之间的七个入射能量下，HCl（v = 2，J = 1）从Au（111）单晶表面散射的高分辨率态对态飞行时间（TOF）测量结果，包括振动弹性（v = 2→2）以及非弹性（v = 2→1）通道。还报告了TOF结果对最终HCl转动状态和表面温度的依赖性。转移到表面的平动能量与入射能量呈线性关系，并且在所研究的整个入射能量范围内接近单个表面原子冲量（鲍勒）极限。振动弛豫的概率也很大。对于从v = 2弛豫到v = 1的分子，转移到表面的振动能量分数约为74%。我们根据冲量近似以及固体中电子 - 空穴对的平动和振动激发的可能作用来讨论这些观察结果。
