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
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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.
| Author(s): | Tasker, A.D., Robson, L., Ledingham, K.W.D., McCanny, T., Hankin, S.M., McKenna, P., Kosmidis, C. and Jaroszynski, D.A. | Item type: | Article |
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| ID code: | 17408 |
| 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. |
| Keywords: | nitro-aromatic molecules, aromatic molecules, femtosecond laser mass spectrometry, ions, Physics, Physical and Theoretical Chemistry |
| Subjects: | Science > Physics |
| Department: | Faculty of Science > Physics |
| Depositing user: | Strathprints Administrator |
| Date deposited: | 15 Apr 2010 10:03 |
| Last modified: | 05 Apr 2019 02:13 |
| URI: | https://strathprints.strath.ac.uk/id/eprint/17408 |
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