Vibrationally resolved shape resonant photoionization of N/sub 2/O
We report a vibrationally resolved dispersed fluorescence study of 7sigma/sup -1/ shape resonant photoionization in N/sub 2/O. Previous work indicates that there are two shape resonances in the epsilonsigma channel, and our results demonstrate that the lower energy shape resonance (h..nu../sub exc/approx. =20 eV) results in non-Franck--Condon vibrational branching ratios over a wide range. Moreover, the cross section curves for alternative vibrational modes behave differently, and we show that the symmetric stretch exerts a greater influence on resonance behavior than the asymmetric stretching vibration. Such comparisons of vibrationally resolved partial cross section curves provide qualitative insights into the shape resonant photoionization dynamics for polyatomic targets. The higher energy shape resonance is apparently masked by the presence of the dominant nonresonant epsilon..pi.. channel. In addition to information on the photoionization dynamics, these results also provide spectroscopic data on the ionic potential surfaces. Specifically, we obtain ratios of Franck--Condon factors for N/sub 2/O/sup +/ (A..-->..X) transitions which are useful for testing calculated properties of the ion.
- Research Organization:
- Department of Chemistry, Boston University, Boston, Massachusetts 02215
- OSTI ID:
- 6538201
- Journal Information:
- J. Chem. Phys.; (United States), Vol. 90:3
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
NITROUS OXIDE
FLUORESCENCE
PHOTOIONIZATION
FRANCK-CONDON PRINCIPLE
NSLS
RESONANCE
SYNCHROTRON RADIATION
ACCELERATORS
BREMSSTRAHLUNG
CHALCOGENIDES
CYCLIC ACCELERATORS
ELECTROMAGNETIC RADIATION
IONIZATION
LUMINESCENCE
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
RADIATION SOURCES
RADIATIONS
SYNCHROTRON RADIATION SOURCES
SYNCHROTRONS
640302* - Atomic
Molecular & Chemical Physics- Atomic & Molecular Properties & Theory