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

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 i...

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Veröffentlicht in:The Journal of chemical physics 2017-07, Vol.147 (1), p.013904-013904
Hauptverfasser: Lee, Chin, Lin, Yen-Cheng, Lee, Shih-Huang, Lee, Yin-Yu, Tseng, Chien-Ming, Lee, Yuan-Tseh, Ni, Chi-Kung
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container_issue 1
container_start_page 013904
container_title The Journal of chemical physics
container_volume 147
creator Lee, Chin
Lin, Yen-Cheng
Lee, Shih-Huang
Lee, Yin-Yu
Tseng, Chien-Ming
Lee, Yuan-Tseh
Ni, Chi-Kung
description 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.
doi_str_mv 10.1063/1.4975671
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source AIP Journals Complete; Alma/SFX Local Collection
subjects Atomic properties
Energy distribution
Imaging
Marking
Photodissociation
Physics
Velocity
title Advantage of spatial map ion imaging in the study of large molecule photodissociation
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