Nature of high CF/sub 4/ vibrational levels excited by proton energy loss spectroscopy
The forced harmonic oscillator model, which has been applied to proton energy loss spectroscopy (PELS), is extended here to probe the nature of CF/sub 4/ vibrational levels excited by the proton beam. At each overtone of the triply degenerate ..nu../sub 3/ vibration, there is a collection of vibrational sublevels which differ in the way amplitude is distributed among the four C--F bonds. The model predicts that PELS populates a broad distribution of these sublevels with a propensity for the highest energy, most delocalized vibrations in each overtone band. Comparison is made with infrared multiphoton absorption which excites delocalized vibrations in SF/sub 6/ and with single photon overtone absorption which selects the most localized states. Peak positions in a simulated spectrum match the experiment up to 8..nu../sub 3/ but for higher overtones the anharmonic shift is up to 0.05 eV less than observed. A demanding test of the model must wait for higher resolution experiments and better spectroscopic constants.
- Research Organization:
- Department of Chemistry, University of Rochester, Rochester, New York 14627
- OSTI ID:
- 6097841
- Journal Information:
- J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 84:8; 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
BEAMS
CARBON TETRAFLUORIDE
CATIONS
CHARGED PARTICLES
COLLISIONS
ENERGY LEVELS
ENERGY LOSSES
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXCITED STATES
FLUORINATED ALIPHATIC HYDROCARBONS
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROGEN IONS
HYDROGEN IONS 1 PLUS
ION COLLISIONS
ION-MOLECULE COLLISIONS
IONS
LOSSES
MOLECULE COLLISIONS
NUCLEON BEAMS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PARTICLE BEAMS
PROTON BEAMS
VIBRATIONAL STATES