Effect of laser parameters on ultrafast hydrogen migration in methanol studied by coincidence momentum imaging

Huailiang Xu; Tomoya Okino; Tatsuya Kudou; Kaoru Yamanouchi; Stefan Roither; Markus Kitzler; Andrius Baltuska; See-Leang Chin

doi:10.1021/jp207483y

Effect of laser parameters on ultrafast hydrogen migration in methanol studied by coincidence momentum imaging

J Phys Chem A. 2012 Mar 22;116(11):2686-90. doi: 10.1021/jp207483y. Epub 2011 Oct 24.

Authors

Huailiang Xu¹, Tomoya Okino, Tatsuya Kudou, Kaoru Yamanouchi, Stefan Roither, Markus Kitzler, Andrius Baltuska, See-Leang Chin

Affiliation

¹ Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Tokyo 113-0033, Japan.

PMID: 22023268
DOI: 10.1021/jp207483y

Abstract

The effect of intensity, duration, and polarization of ultrashort laser pulses (795 nm, 40-100 fs, and 0.15-1.5 × 10(15) W/cm(2)) on the hydrogen migration in methanol is systematically investigated using Coulomb explosion coincidence momentum imaging. The ratio of the ion yield obtained for the migration pathway CH(3)OH(2+) → CH(2)(+) + OH(2)(+) with respect to the sum of the yields obtained for the migration pathway and for the nonmigration pathway CH(3)OH(2+) → CH(3)(+) + OH(+) exhibits a small (10-20%) but clear dependence on laser pulse properties, that is, the ratio decreases as the laser peak intensity increases but increases when the pulse duration increases as well as when the laser polarization is changed from linear to circular.