Bornscheuer, K.H.; Nessler, W.; Binetti, M.; Hasselbrink, Eckart; Saalfrank, P.:
Isotope and Quantum Effects in Vibrational State Distributions of Photodesorbed Ammonia
1997
In: Physical Review Letters, Jg. 78 (1997), Heft 6, S. 1174 - 1177
Artikel/Aufsatz in Zeitschrift1997Chemie
Titel:
Isotope and Quantum Effects in Vibrational State Distributions of Photodesorbed Ammonia
Autor(in):
Bornscheuer, K.H.; Nessler, W.; Binetti, M.; Hasselbrink, EckartLSF; Saalfrank, P.
Erscheinungsjahr
1997
DOI:
Erschienen in:
Titel:
Physical Review Letters
in:
Jg. 78 (1997), Heft 6, S. 1174 - 1177
ISSN:

Abstract:

A marked quantum effect has been obsd. in the vibrational state distribution of ammonia photodesorbed from copper surface. Namely, for quantum nos. larger than zero, sym. and antisym. levels in the ν₂ mode of the desorbed ammonia mol. are unequally populated. A strong propensity for sym. levels is obsd. for NH₃, whereas the reverse is found for ND₃. Model calcns. reproduce this effect. Moreover, it is found that the actual ratios probe the binding energy in the energetically less favorable inverted geometry with the H atoms pointing towards the surface.