Author :
Tabrizchi, M.,Boggis, S. A.,Dyke, J. M
Abstract :
The(3d0)**1.3 phi and (4dq)**1.3 phi ryderg states of NF have been investiogated by multiphoton ionizaton (MPI) spectroscopy. These states were observed as two-photon resonances in overall (2+1) MpI process form NF a**1 F+N3 reaction Av-initio calculations performed at the multireference double excitation configuration interaction level showed that the excited states were of rydberg character with cinngurations of...1 (3dq)1and (4dq)1. The two-photon transition were found to derive their intensities from spin-orbit and spin-uncoipling interactions and upper states.Analysis of the rotationally resolved bands,using a model which includes these factors,allowed the spin-orbit constant,a-, for the 2- valence orbital to be derived as (159.0+1.0)cm-1. Rotationally resolved envelopes recorded for the(3dq)1 phi,v prime=0, 1-a**1 and(3p ) (2+1)NF MPI bands, could be simulated reasonably well assuming a Boltzmann rotational distribution for the state at 180K. Experiments showed,however, that this was not a true measure of the initial state distribution because of predissociation or perturbation effects in the resonant intermediate state. Assignments for other two-photon resonant NF MPI bands observed in this work are also suggested . 1995 American institule of physics.
