Double photoionization of rotating linear molecules |
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Authors: | N Chandra S Sen |
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Institution: | (1) Department of Physics & Meteorology, Indian Institute of Technology, Kharagpur 721302, India, IN |
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Abstract: | 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.
Received: 7 August 1998 |
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Keywords: | 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 |
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