Nonadiabatic effects on the photodissociation of diatomic molecules to open-shell atoms. [CH/sup +/ + h nu. -->. C/sup +/(2/sup 2/P/sub 1/2, 3/2/) + H(1/sup 2/S)]

Journal Article · Thu Oct 08 00:00:00 EDT 1987 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100305a005· OSTI ID:5940945

Band, Y B; Freed, K F; Singer, S J; Williams, C J

Photodissociation of diatomic molecules to open-shell atoms is shown to be very strongly affected by nonadiabatic interactions when the photon energy is just above the threshold for dissociation. The energy dependences of photodissociation cross sections and various anisotropy parameters exhibit a wealth of structure in conformity with their theoretical predictions that nonadiabatic interactions between molecular states, approaching the same atomic term limit, lead to the emergence of resonance features in the spectra. Some of these features are associated with Feshbach and shape resonances on states that carry no oscillator strength in zeroth order. As an example, they consider the photodissociation cross sections for the production of individual C/sup +/(/sup 2/P/sub 3/2,1/2/) states from selected initial CH/sup +/ levels and the fragment angular distribution, orientation, and alignment. They discuss how totally oriented fragments can be produced by near-threshold photodissociation in a magnetic field.

• Research Organization: Ben Gurion Univ., Beer-Sheva, Israel
• OSTI ID: 5940945
• Journal Information: J. Phys. Chem.; (United States), Vol. 91:21
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ALKYL RADICALS
DISSOCIATION
CARBON
POLARIZATION
HYDROGEN
ANGULAR DISTRIBUTION
CATIONS
MAGNETIC FIELDS
PHOTOCHEMISTRY
THEORETICAL DATA
CHARGED PARTICLES
CHEMISTRY
DATA
DISTRIBUTION
ELEMENTS
INFORMATION
IONS
NONMETALS
NUMERICAL DATA
RADICALS
400500* - Photochemistry