Step-ladder Rabi oscillations in molecules exposed to intense ultrashort vuv pulses

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A. Palacios,¹ H. Bachau,² and F. Martín¹
¹Departamento de Química, C-9, Universidad Autónoma de Madrid, 28049 Madrid, Spain
²Centre des Lasers Intenses et Applications (UMR 5107 du CNRS–CEA–Université de Bordeaux I), 351 Cours de la Libération, F-33405 Talence, France

Received 27 March 2006; published 5 September 2006

Wetheoretically investigate the production of Rabi-type oscillations in two-photon resonantionization of H₂ by intense ultrashort vuv pulses. We showthat, with such pulses, oscillations proceed through a step-ladder mechanismthat successively involves higher and higher vibrational levels of thelower and upper electronic states. The consequences of this mechanismare (i) the relatively large proportion of H₂ molecules inexcited electronic states not accessible by direct photon absorption, (ii)the splitting in the energy distribution of ionized electrons, and(iii) the unusually broad (non-Franck-Condon) vibrational distribution of both H₂and H₂⁺.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.74.031402
DOI:	10.1103/PhysRevA.74.031402
PACS:	33.80.Rv 33.80.Rv Multiphoton ionization and excitation to highly excited states in molecules e.g., Rydberg states YEAR: 2006
KEYWORDS:	two-photon processes, molecule-photon collisions, ionisation, vibrational states, excited states, Franck-Condon factors, positive ions, hydrogen neutral atoms, hydrogen ions

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