Dissociative ionization of benzene in intense laser fields of picosecond duration

Bhardwaj, V. R. ; Vijayalakshmi, K. ; Mathur, D. (1999) Dissociative ionization of benzene in intense laser fields of picosecond duration Physical Review A, 59 (2). pp. 1392-1398. ISSN 1050-2947

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Official URL: http://pra.aps.org/abstract/PRA/v59/i2/p1392_1

Related URL: http://dx.doi.org/10.1103/PhysRevA.59.1392


Mass spectrometry experiments have been performed to probe the morphology of dissociative ionization of a ring molecule benzene when it is immersed in a laser field of 35-ps duration whose intensity is in the range 1013 W cm-2. The field-induced fragmentation pattern is grossly different from that obtained by electron impact. The intense laser field clearly gives rise to much more fragmentation. Covariance mapping has been applied to study field-induced formation of highly charged molecular ions. Results indicate that the overall fragmentation dynamics is complex and is likely to involve both fast ladder switching as well as multiple ionization of fragment molecules at some intermediate steps in the ladder. Angular distributions of fragment ions have been measured. Anisotropic distributions indicate that some fragments are produced from precursors that are strongly aligned along the direction of the laser polarization vector while at least one fragment is formed from a precursor whose angular distribution is markedly isotropic. The nature of the precursors remains to be discovered.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:77572
Deposited On:13 Jan 2012 06:50
Last Modified:13 Jan 2012 06:50

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