Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/143149
Title: Ultrafast dissociative ionization and large-amplitude vibrational wave packet dynamics of strong-field-ionized di-iodomethane
Authors: Wei, Zhengrong
Li, Jialin
Zhang, Huimin
Lu, Yunpeng
Yang, Minghui
Loh, Zhi-Heng
Keywords: Science::Chemistry
Issue Date: 2019
Source: Wei, Z., Li, J., Zhang, H., Lu, Y., Yang, M., & Loh, Z.-H. (2019). Ultrafast dissociative ionization and large-amplitude vibrational wave packet dynamics of strong-field-ionized Di-iodomethane. The Journal of Chemical Physics, 151(21), 214308-. doi:10.1063/1.5132967
Journal: The Journal of Chemical Physics
Abstract: We employ few-cycle pulses to strong-field-ionize di-iodomethane (CH2I2) and femtosecond extreme ultraviolet (XUV) transient absorption spectroscopy to investigate the subsequent ultrafast dissociative ionization and vibrational wave packet dynamics. Probing in the spectral region of the I 4d core-level transitions, the time-resolved XUV differential absorption spectra reveal the population of several electronic states of CH2I2+ by strong-field ionization. Global analysis reveals three distinct time scales for the observed dynamics: 20 ± 2 fs, 49 ± 6 fs, and 157 ± 9 fs, ascribed to relaxation of the CH2I2+ parent ion from the Franck-Condon region, dissociation of high-lying excited states of CH2I2+ to I+ (3P2), CH2I, and I2+ (2Π3/2,g), and dissociation of CH2I2+ to I (2P3/2) and CH2I+, respectively. Oscillatory features in the time-resolved XUV differential absorption spectra point to the generation of vibrational wave packets in both the residual CH2I2 and the CH2I2+ parent ion. Analysis of the oscillation frequencies and phases reveals, in the case of neutral CH2I2, C-I symmetric stretching induced by bond softening and I-C-I bending driven by a combination of bond softening and R-selective depletion. In the case of CH2I2+, both the fundamental and first overtone frequencies of the I-C-I bending mode are observed, indicating large-amplitude I-C-I bending motion, in good agreement with results obtained from ab initio simulations of the XUV transition energy along the I-C-I bend coordinate. These results show that femtosecond XUV absorption spectroscopy is well-suited for studying ultrafast photodissociation and vibrational wave packet dynamics.
URI: https://hdl.handle.net/10356/143149
ISSN: ‎0021-9606
DOI: 10.1063/1.5132967
Rights: © 2019 Author(s). All rights reserved. This paper was published by AIP Publishing in The Journal of Chemical Physics and is made available with permission of Author(s).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

SCOPUSTM   
Citations 50

1
Updated on Mar 10, 2021

PublonsTM
Citations 20

1
Updated on Mar 3, 2021

Page view(s)

160
Updated on Jun 25, 2022

Download(s) 50

20
Updated on Jun 25, 2022

Google ScholarTM

Check

Altmetric


Plumx

Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.