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Rotationally inelastic gas--surface scattering: HCl from Au(111)

Journal Article · · Journal of Chemical Physics; (USA)
DOI:https://doi.org/10.1063/1.457955· OSTI ID:6996510
;  [1]
  1. Sandia National Laboratories, Albuquerque, New Mexico 87185 (US)
+ Show Author Affiliations
A quantum-resolved molecular beam--surface scattering study of HCl scattered from Au(111) is described. The HCl is detected in a quantum-resolved manner via (2+1) resonant enhanced multiphoton ionization (REMPI). Greater than 85% of the incident HCl molecules are in a single-quantum state ({ital v}=0, {ital J}=0) with a narrow velocity distribution ({Delta}{upsilon}/{upsilon}{lt}0.10). The scattered HCl is strongly peaked about the specular angle, and both its final velocity and rotational distributions are indicative of direct inelastic scattering. The scattered rotational distributions exhibit features characteristic of rotational rainbows and have a mean rotational energy that displays a bilinear dependence upon the incident normal kinetic energy and surface temperature. The final velocity distributions are largely insensitive to the rotational level and indicate that the energy loss to phonons is small ({lt}20%). Analysis of the scattered data indicates an orientation-averaged attractive well depth of {similar to}5 kcal/mol for the HCl--Au(111) interaction.
DOE Contract Number:
AC04-76DP00789
OSTI ID:
6996510
Journal Information:
Journal of Chemical Physics; (USA), Journal Name: Journal of Chemical Physics; (USA) Vol. 92:4; ISSN JCPSA; ISSN 0021-9606
Country of Publication:
United States
Language:
English

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Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
656003 -- Condensed Matter Physics-- Interactions between Beams & Condensed Matter-- (1987-)
74 ATOMIC AND MOLECULAR PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BEAMS
COLLISIONS
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
GOLD
HYDROCHLORIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
METALS
MOLECULAR BEAMS
MOLECULE COLLISIONS
ORIENTATION
ROTATIONAL STATES
SURFACES
TRANSITION ELEMENTS