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• W4321451027 abstract "In this work we report the result of a photoionization experiment in which photoelectron energy spectra were collected following 2+1 MPI of H 2 via the E,F states. The bound states studied include those at the bottom of the inner E-well (v E,F =3), at the barrier of the double potential in the inside E-well (v E,F =6) and its counterpart in the outer F-well (v E,F =7), and above the barrier (v E,F =9). The E,F state wavefunctions are not confined in one or the other potential well only. This leads to a dynamic competition between direct photoionization, autoionization and dissociation. In our experiment the photoelectrons show strong non-Franck-Condon vibrational distribution. Some of the high vibrational states of <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=eq1 display=inline> <mml:mrow> <mml:msubsup> <mml:mtext>H</mml:mtext> <mml:mn>2</mml:mn> <mml:mo>+</mml:mo> </mml:msubsup> </mml:mrow> </mml:math> are so largely enhanced that they dominate the electron spectra, for examples, the v + =13 in v E,F =6, and the v + =14, 16 in v E,F =9; the Franck-Condon picture is even more distorted when a mainly F-state is excited as in v E,F =7. SUMMARY In this work we report the result of a photoionization experiment in which photoelectron energy spectra were collected following 2+1 MPI of H 2 via the E,F states. The bound states studied include those at the bottom of the inner E-well (v E,F =3), at the barrier of the double potential in the inside E-well (v E,F =6) and its counterpart in the outer F-well (v e,f =7), and above the barrier (v e,f =9). The E,F state wavefunctions are not confined in one or the other potential well only. This leads to a dynamic competition between direct photoionization, autoionization and dissociation. In our experiment the photoelectrons show strong non-Franck-Condon vibrational distribution. Some of the high vibrational states of <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=eq2 display=inline> <mml:mrow> <mml:msubsup> <mml:mtext>H</mml:mtext> <mml:mn>2</mml:mn> <mml:mo>+</mml:mo> </mml:msubsup> </mml:mrow> </mml:math> are so largely enhanced that they dominate the electron spectra, for examples, the v + =13 in v e,f =6, and the v + =14, 16 in v e,f =9; the Franck-Condon picture is even more distorted when a mainly F-state is excited as in v e,f =7. The experient is performed with a YAG-PDL-WEX pulse laser system and a high-presure H2 Raman cell. Photoelectrons are collected in a state-of-the art high resolution TOF electron spectrometer which uses permanent magnets in the magnetic bottle design. We compare the experimental results with a theoretical calculation of cross sections which includes contributions from direct photoionization and autoionization using the nonlocal complex potential method." @default.
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• W4321451027 date "1988-01-01" @default.
• W4321451027 modified "2023-09-30" @default.
• W4321451027 title "Photoelectron Spectroscopy of Vibrationally Excited H2 E,F States" @default.
• W4321451027 doi "https://doi.org/10.1364/oam.1988.pdp25" @default.
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