Valence electron ionization dynamics of chromium by a photoelectron imaging technique: J+-dependent state and angular distribution.
J Phys Chem A
; 117(10): 2138-43, 2013 Mar 14.
Article
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| MEDLINE
| ID: mdl-23428211
The photoionization of Cr at excited states is investigated using a velocity-map photoelectron imaging technique. Benzene chromium carbonyl or bis(η(6)-benzene) chromium was used as a precursor for the generation of excited Cr atoms. The a (5)S2 â x (5)P°3 and a (5)D3 â y (5)D°2 transitions are then employed for the preparation of resonant intermediate states in a two-color two-photon ionization process, in which an electronic configurational change from 3d(4)((5)D)4s4p((1)P°) to 3d(4)4s((6)D(J+)) occurs. The photoelectron kinetic energy distribution is found to be very sensitive to the ionization energy and the total angular momentum quantum number of the chromium ion (J(+)). Anisotropy parameters associated with departing electrons also show significant variation depending on the energy and total angular momentum quantum number, suggesting that direct and/or indirect ionization should be quantum-mechanically mixed, manifesting the complicated nature of angular momentum couplings in the ionization continuum.
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MEDLINE
Idioma:
En
Revista:
J Phys Chem A
Asunto de la revista:
QUIMICA
Año:
2013
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Article