Vibrationally resolved shape resonant photoionization of N/sub 2/O

Journal Article · Wed Feb 01 04:00:00 EST 1989 · J. Chem. Phys.; (United States)

OSTI ID:6538201

Kelly, L A; Duffy, L M; Space, B; Poliakoff, E D; Roy, P; Southworth, S H; White, M G

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), Journal Name: J. Chem. Phys.; (United States) Vol. 90:3; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ACCELERATORS
BREMSSTRAHLUNG
CHALCOGENIDES
CYCLIC ACCELERATORS
ELECTROMAGNETIC RADIATION
FLUORESCENCE
FRANCK-CONDON PRINCIPLE
IONIZATION
LUMINESCENCE
NITROGEN COMPOUNDS
NITROGEN OXIDES
NITROUS OXIDE
NSLS
OXIDES
OXYGEN COMPOUNDS
PHOTOIONIZATION
RADIATION SOURCES
RADIATIONS
RESONANCE
SYNCHROTRON RADIATION
SYNCHROTRON RADIATION SOURCES
SYNCHROTRONS