Recombinative desorption dynamics: Molecular hydrogen from Cu(110) and Cu(111)

摘要: The rotational and vibrational distributions of H2 D2 recombinatively desorbing from clean Cu(110) Cu(111) surfaces following atomic permeation are studied using multiphoton ionization combined with time‐of‐flight mass spectrometry. Rotational found to be non‐Boltzmann possess mean energies which 80%–90% the surface temperature, Ts. These identical within experimental accuracy for also desorption (110) (111) faces. Moreover, ortho para nuclear spin modifications both isotopes statistically populated. In contrast, population ratio, Pv‘=1/Pv‘=0, is as much 100 times greater than ratio corresponding a Boltzmann at Specifically, Pv‘=1/Pv‘=0 (D2) 0.052±0.014 (0.24±0.20) Cu(110), 0.084±0.030 (0.35±0.20) Cu(111). For comparison Boltzmann‐at‐Ts ratios would 0.0009 H...