Enhancement and Control of H₂ Dissociative Ionization by Femtosecond VUV Laser 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 17 November 2005; published 10 April 2006

Wereport ab initio calculations of H₂ ionization by VUV/fs 10¹² W/cm² laserpulses including correlation and all electronic and vibrational degrees offreedom (DOF). Inclusion of the nuclear DOF leads to asubstantial increase of resonance enhanced multiphoton ionization. By varying pulseduration, it is possible to control the ratio of dissociativeto nondissociative ionization as well as the final H <sub>2</sub><sup>+</sup> vibrationaldistribution. For pulses longer than 10 fs and [h-bar] omega >0.46 a.u., dissociative ionizationentirely dominates, which is a very unusual situation in photoionizationstudies.

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.96.143001
DOI:	10.1103/PhysRevLett.96.143001
PACS:	33.80.Rv 33.80.Rv Multiphoton ionization and excitation to highly excited states in molecules e.g., Rydberg states YEAR: 2006
KEYWORDS:	photoionisation, hydrogen neutral molecules, positive ions, ab initio calculations, multiphoton processes, vibrational states

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