In:
Chinese Journal of Chemical Physics, AIP Publishing, Vol. 29, No. 1 ( 2016-02-27), p. 53-58
Abstract:
The photodissociation dynamics of 2-iodotoluene following excitation at 266 nm have been investigated employing femtosecond time-resolved mass spectrometry. The photofragments are detected by multiphoton ionization using an intense laser field centered at 800 nm. A dissociation time of 380±50 fs was measured from the rising time of the co-fragments of toluene radical (C7H7) and iodine atom (I), which is attributed to the averaged time needed for the C−I bond breaking for the simultaneously excited nσ* and ππ* states by 266 nm pump light. In addition, a probe light centered at 298.23 nm corresponding to resonance wavelength of ground-state iodine atom is used to selectively ionize ground-state iodine atoms generated from the dissociation of initially populated nσ* and ππ* states. And a rise time of 400±50 fs is extracted from the fitting of time-dependent I+ transient, which is in agreement with the dissociation time obtained by multiphoton ionization with 800 nm, suggesting that the main dissociative products are ground-state iodine atoms.
Type of Medium:
Online Resource
ISSN:
1674-0068
,
2327-2244
DOI:
10.1063/1674-0068/29/cjcp1512243
Language:
English
Publisher:
AIP Publishing
Publication Date:
2016
detail.hit.zdb_id:
2381472-X
SSG:
6,25
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