Photodissociation dynamics of N-methylindole N-methylpyrrole and anisolet

Chien-Ming Tseng, Yuan T. Lee, Chi Kung Ni*

*Corresponding author for this work

Research output: Contribution to journalArticle

30 Scopus citations

Abstract

Photodissociation experiments employing molecular beams of VV-methylindole, VV-methylpyrrole, and anisole at 193 and 248 nm, respectively, have been conducted using multimass ion imaging techniques. We find that CH3 elimination is the sole dissociation channel for the studied molecules at both 193 and 248 nm. The photofragment translational energy distribution of anisole is found to contain both fast and slow components at the two wavelengths. On the other hand, a fast component (large recoil velocity) is dominant for VV-methylindole at 248 nm, and a slow component (small recoil velocity) is dominant at 193 nm. The absorption coefficient of VV-methylpyrrole is too weak for study at 248 nm. The photofragment translational energy distribution at 193 nm includes a large portion of the slow component and a small portion of the fast component. The findings indicate that the fast component corresponds to dissociation from the repulsive excited state and the slow component corresponding to dissociation from the ground electronic state. A comparison with the photodissociation dynamics of phenol, pyrrole, and indole suggests that replacement of the H atom by CH3 does not change the dissociation channels on the excited state. However, the respective dissociation channels for anisole and VV-methylpyrrole on the ground state differ significantly from that for phenol and pyrrole.

Original languageEnglish
Pages (from-to)3881-3885
Number of pages5
JournalJournal of Physical Chemistry A
Volume113
Issue number16
DOIs
StatePublished - 23 Apr 2009

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