Vibrational de-excitation of v=1 H2 during collisions with a Cu(100) surface

Observation of a change of vibrational excitation mechanism with surface temperature: HCl collisions with Au(111).

We have measured the vibrational excitation probability (Pv) of HCl incident on a Au(111) surface at kinetic energies (Ei) of 0.59 eV to 1.37 eV and surface temperatures (Ts) of 273 K to 1073 K. For all energies, the slope of the Pv as a function of Ts exhibits a sharp increase above Ts approximately 800 K. We show this change in slope and the threshold behavior of Pv to be consistent with a ch...

Mutual vibrational quenching in CO + H2 collisions

Article history: Available online 3 August 2015

Vibrational Excitation of H2 Scattering from Cu(111): Effects of Surface Temperature and of Allowing Energy Exchange with the Surface

In scattering of H2 from Cu(111), vibrational excitation has so far defied an accurate theoretical description. To expose the causes of the large discrepancies with experiment, we investigate how the feature due to vibrational excitation (the "gain peak") in the simulated time-of-flight spectrum of (v = 1, j = 3) H2 scattering from Cu(111) depends on the surface temperature (Ts) and the possibi...

Electronic and Vibrational Excitation in Atom/ Molecule Collisions

State resolved rotational excitation cross sections and rates in H2+H2 collisions

Rotational transitions in molecular hydrogen collisions are computed. The two most recently developed potential energy surfaces for the H2−H2 system are used from the following works: 1) A.I. Boothroyd, P.G. Martin, W.J. Keogh, M.J. Peterson, J. Chem. Phys., 116 (2002) 666, and 2) P. Diep, J.K. Johnson, J. Chem. Phys., 113 (2000) 3480; ibid. 112, 4465. Cross sections for rotational transitions ...