N. Chandra et M. Chakraborty, STATE-SELECTED AND ORIENTED MOLECULES - ROTATIONALLY-RESOLVED PHOTOELECTRON-SPECTROSCOPY AND DICHROISM IN IONIZATION OF SYMMETRICAL TOPS, Zeitschrift fur Physik. D, Atoms, molecules and clusters, 41(1), 1997, pp. 43-55
This paper developes a theoretical framework for one-photon, electric
dipole ionization of molecules, prepared in a single \JKM] rotational
state of their ground electronic motion using a hexapole electrostatic
field followed by a weak and homogeneous orienting electric field E,
by taking also the \J'K'M'] eigenstate of the residual photoion into a
ccount. This theory has been used to study photoionization in a generi
c C-3v molecule by the linearly as well as circularly polarized light.
Integrated and differential photocurrents plus circular dichroism, ob
tained from a model calculation, for ionization in two different exper
imental configurations in 13 alpha(iota)(2) orbital of a state selecte
d and oriented CH3I are discussed. These results show, among other thi
ngs, that somewhat different propensity rules for \JKM] --> \J'K'M'] t
ransitions are obeyed in different experimental geometries. Also, dich
roic effect exists in the photoelectron angular distribution when circ
ularly polarized light is incident perpendicular to E.