Advantage of spatial map ion imaging in the study of large molecule photodissociation

Chin Lee, Yen Cheng Lin, Shih Huang Lee, Yin Yu Lee, Chien-Ming Tseng, Yuan Tseh Lee, Chi Kung Ni

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

The original ion imaging technique has low velocity resolution, and currently, photodissociation is mostly investigated using velocity map ion imaging. However, separating signals from the background (resulting from undissociated excited parent molecules) is difficult when velocity map ion imaging is used for the photodissociation of large molecules (number of atoms ≥ 10). In this study, we used the photodissociation of phenol at the S1 band origin as an example to demonstrate how our multimass ion imaging technique, based on modified spatial map ion imaging, can overcome this difficulty. The photofragment translational energy distribution obtained when multimass ion imaging was used differed considerably from that obtained when velocity map ion imaging and Rydberg atom tagging were used. We used conventional translational spectroscopy as a second method to further confirm the experimental results, and we conclude that data should be interpreted carefully when velocity map ion imaging or Rydberg atom tagging is used in the photodissociation of large molecules. Finally, we propose a modified velocity map ion imaging technique without the disadvantages of the current velocity map ion imaging technique.

Original languageEnglish
Article number013904
JournalJournal of Chemical Physics
Volume147
Issue number1
DOIs
StatePublished - 7 Jul 2017

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