A high mass resolution study of the interaction of aromatic and nitro-aromatic molecules with intense laser fields

Tasker, A.D. and Robson, L. and Ledingham, K.W.D. and McCanny, T. and Hankin, S.M. and McKenna, P. and Kosmidis, C. and Jaroszynski, D.A. (2002) A high mass resolution study of the interaction of aromatic and nitro-aromatic molecules with intense laser fields. Journal of Physical Chemistry A, 106 (16). pp. 4005-4013. ISSN 1089-5639 (http://dx.doi.org/10.1021/jp013830n)

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Abstract

The technique of femtosecond laser mass spectrometry has been applied to benzene, nitrobenzene, toluene and nitrotoluene using pulses of 80 fs and λ = 800 nm (1014 − 1016 W cm-2). The ultrafast laser pulses used were able to largely defeat the dissociation pathways associated with nanosecond ionization and produce a molecular ion for both the aromatics and the two photounstable nitro-aromatics. The high mass resolution (m/Δm = 800) permitted, for the first time, the observation of various doubly charged species and allowed a study of the effect of the substituent NO2 group on the multiple ionization process. It was found that the femtosecond laser irradiation of benzene and toluene enabled the production of a doubly charged cation envelope in each case along with an additional doubly ionized contribution from certain lower mass fragments. Doubly ionized species were also observed for the nitro-aromatics including, most notably the loss of NO2 doubly charged ion ([M−NO2]2+) although a doubly charged parent was not observed. In addition, an NO2+ ion was detected for both nitro-aromatics which was thought to be evidence of a 'charge-separation' process involving a transient doubly charged molecular ion.

  • Item type:Article
    ID code:17408
    Dates:
    Date
    Event
    25 April 2002
    Published
    Notes:Strathprints' policy is to record up to 8 authors per publication, plus any additional authors based at the University of Strathclyde. More authors may be listed on the official publication than appear in the Strathprints' record.
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Strathprints Administrator
    Date deposited:15 Apr 2010 10:03
    Last modified:08 Apr 2024 17:26
    URI:https://strathprints.strath.ac.uk/id/eprint/17408
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