Measurements of rotational and vibrational quantum transition probabilities in the scattering of Li/sup +/ from N/sub 2/ and CO at center of mass energies of 4. 23 and 7. 07 eV
Angular distributions and time of flight spectra for the scattering of Li/sup +/ ions from ground state N/sub 2/ and CO molecules have been measured over a range of scattering angles (0degree< or =theta/sub c.m./< or =60degree) and for E/sub c.m./ =4.23 and 7.07 eV. The time of flight spectra show a number of maxima which have been attributed to unresolved rotational excitation superimposed upon vibrational quantum transitions corresponding to n=0..-->..0, 0..-->..1, and 0..-->..2. The laboratory spectra have been transformed into the center of mass system to obtain relative inelastic differential cross sections. Significant differences between the vibrational inelastic cross sections for N/sub 2/ and CO are observed at large angles at the highest energy studied. The results are discussed in terms of the SCF potential hypersurfaces. The differences in the vibrational cross sections cannot be explained in terms of the infinite order sudden approximation and the vibrational matrix elements of the SCF hypersurfaces. This suggests that the inclusion of rotational--vibrational coupling % in the dynamics and/or an improved hypersurface are called for. (AIP)
- Research Organization:
- Max-Planck-Institut fur Stromungsforschung, 34 Gottingen, West Germany
- OSTI ID:
- 7346118
- Journal Information:
- J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 65:2; ISSN JCPSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOMIC IONS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
CRYOGENIC FLUIDS
ELEMENTS
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EV RANGE
EV RANGE 01-10
EXCITATION
EXCITED STATES
FLUIDS
INELASTIC SCATTERING
ION COLLISIONS
ION-MOLECULE COLLISIONS
IONS
LITHIUM IONS
MOLECULE COLLISIONS
NITROGEN
NONMETALS
OXIDES
OXYGEN COMPOUNDS
ROTATIONAL STATES
SCATTERING
TIME-OF-FLIGHT METHOD
VIBRATIONAL STATES