https://doi.org/10.1007/s100530050331
Double photoionization of rotating linear molecules
Department of Physics & Meteorology, Indian Institute of Technology, Kharagpur 721302,
India
Received:
7
August
1998
Published online: 15 July 1999
This communication presents a theoretical study of the angular distribution
of one or both of the two electrons emitted in one-photon, one-step double
ionization of a linear molecule. Experiments which do or do not detect spin
of the photoelectrons have been considered. Effects of molecular rotation
on double photoionization have been studied in both Hund's coupling schemes
(a) and (b) by using parity-adapted states. Selection rules obtained in this
paper are very different from those derived earlier for single photoionization
and for Auger decay following the absorption of a photon in a rotating linear
molecule. It is shown that complete specification of the spin-unresolved
and of spin-resolved angular distributions of both photoelectrons require,
respectively, three and seven parameters which depend, among other things,
on their energies as well as directions of emission. The approach developed
in this paper has been used to analyze spin-unresolved double photoionization
in the 
shell of the 
molecule. The angular
distribution is quite different depending on whether or not molecular
rotation has been taken into account. Also, it is found to change
significantly for different rotational transitions. Effects of
electron-electron correlation are clearly manifested even in
non-coincident, both rotationally resolved-as well as unresolved-double
photoionization.
PACS: 33.60.Cv – Ultraviolet and vacuum ultraviolet photoelectron spectra / 33.80.Eh – Autoionization, photoionization, and photodetachment / 33.90.+h – Other topics in molecular properties and interactions with photons
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1999
