State-to-state rotationally inelastic scattering of ND[sub 3] on a graphite (0001) surface
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90024 (United States)
State-selected molecular beams of deuterated ammonia, [vert bar][ital JKM][epsilon][gt][vert bar]inversion[gt]=[vert bar]1111[gt][vert bar][minus][gt] or [vert bar]222[minus]1[gt][vert bar][minus][gt] and [vert bar]3331[gt][vert bar][minus][gt] states in the proportion 2.3:1, are produced via hexapole electrostatic focusing and then scattered at near-normal incidence on a graphite (0001) surface at [ital T][sub [ital s]]=130 K. The post-collisional rotational distribution of directly scattered molecules is monitored by laser photoionization spectroscopy. It is observed that the state-to-state rotational transitions in the surface scattering of ND[sub 3] are strongly coupled to the inversion symmetry change, as predicted by Corey and Alexander [J. Chem. Phys. [bold 89], 790 (1988)]. This coupling may be viewed as a constructive and destructive interference between the left'' and right'' inversion configurations of the molecule on the surface potential. The selection rules prohibiting para to ortho conversion, which have been predicted by Corey and Alexander for rotationally inelastic scattering of ammonia, are observed to be violated, perhaps, due to ND[sub 3] distortion at the impact.
- OSTI ID:
- 6850817
- Journal Information:
- Journal of Chemical Physics; (United States), Journal Name: Journal of Chemical Physics; (United States) Vol. 97:12; ISSN JCPSA6; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AMMONIA
BEAMS
CARBON
COLLISIONS
DEUTERIUM COMPOUNDS
ELECTRON SPECTROSCOPY
ELECTROSTATICS
ELEMENTAL MINERALS
ELEMENTS
ENERGY LEVELS
EXCITED STATES
FOCUSING
GRAPHITE
HYDRIDES
HYDROGEN COMPOUNDS
INCIDENCE ANGLE
INELASTIC SCATTERING
LASERS
MICROWAVE SPECTRA
MINERALS
MOLECULAR BEAMS
MOLECULE COLLISIONS
MONITORING
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NONMETALS
PHOTOELECTRON SPECTROSCOPY
ROTATIONAL STATES
SCATTERING
SELECTION RULES
SPECTRA
SPECTROSCOPY
SURFACES
TEMPERATURE RANGE
TEMPERATURE RANGE 0065-0273 K