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Electronic autoionization and vibrational-state distributions in resonant multiphoton ionization of H2

Dixit, S. N. and Lynch, D. L. and McKoy, B. V. and Hazi, A. U. (1989) Electronic autoionization and vibrational-state distributions in resonant multiphoton ionization of H2. Physical Review A, 40 (3). pp. 1700-1703. ISSN 0556-2791. doi:10.1103/PhysRevA.40.1700.

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We investigate the effects of electronic autoionization on the vibrational branching ratios in resonant multiphoton ionization of H2. Ab initio calculations are performed to obtain the vibrational branching ratios for (3+1) resonant-enhanced multiphoton ionization (REMPI) of H2 via the C 1Πu state. Our calculations include the effects of the dissociative 1Πg(1σu1πu) autoionizing state and properly account for the interference between the direct and the indirect (autoionization) channels. We find that the direct and indirect amplitudes are comparable for excitation via the higher (vi≥2) vibrational levels of the C state. Autoionization greatly enhances the branching ratios for Δv≠0 transitions. These calculations underscore the necessity for a proper treatment of both the direct and indirect contributions in understanding the REMPI of molecules via autoionizing states.

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Additional Information:©1989 The American Physical Society Received 28 December 1988 We acknowledge several useful discussions with T. Rescigno, L.A. Collins, and B.I. Schneider. Work done at the Lawrence Livermore National Laboratory, by S.N.D. and A.U.H., was performed under the auspices of the U.S. Department of Energy under Contract No. W-7405-ENG-48. Work done by B.V.M. was supported by grants from the National Science Foundation (No. CHE-8521391), the Air Force Office of Scientific Research (Contract No. 87-0039), and the Office of Health and Environmental Research, U.S. Department of Energy (No. DE-FG03-87ER60513). D.L.L. also acknowledges financial support from the National Science Foundation.
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Deposited On:12 Dec 2006
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