Effect of vibrational pre-excitation on sub-femtosecond structural evolution of water cation in 2A1 state

Cited 0 time in webofscience Cited 0 time in scopus
7 Viewed 1 Downloaded
Title
Effect of vibrational pre-excitation on sub-femtosecond structural evolution of water cation in 2A1 state
Author(s)
Jayachander Rao Borker; Minhaeng Cho
Publication Date
2018-11
Journal
CHEMICAL PHYSICS, v.515, no., pp.400 - 410
Publisher
ELSEVIER SCIENCE BV
Abstract
We study the effects of vibrational excitation of neutral water molecule on sub-femtosecond nuclear dynamics of the 2A1 electronic state of cationic water and its isotopomers that are induced by high-harmonic generation (HHG) process. Both the photoelectron spectra and the autocorrelation functions of electronically excited states of M2O+ (M = H, D, and T) that are produced by Franck-Condon ionization of vibrationally pre-excited M2O to its 2A1 electronic state are calculated. HHG signals are also calculated from the square of the absolute value of autocorrelation functions. In addition, the ratio of the HHG signal of D2O+ to that of H2O+ and that between T2O+ and H2O+ are calculated with respect to time, for varying initially prepared vibrational state of the corresponding neutral molecule. Vibrational dynamics are notably strong on the 2A1 state of the cationic species, as the initial vibrational quantum number increases. The HHG signal of a heavier isotopomer is larger than that of water when the initial vibrational state is on its ground state. The expectation values of the bond length and bond angle show quasiperiodic oscillations with respect to time, which are ascribed to the observed overall rise in the HHG signals. Exceptionally strong vibrational dynamics observed on the 2A1 state potential energy surface of the cationic water molecule can be attributed to the excitation of water bending mode upon Franck-Condon ionization of the corresponding neutral molecule. Here, the observed peaks in the ratios of the HHG signals are theoretically explained in terms of time-evolving molecular structures at two different turning points of the 2A1 surface. We anticipate that the present computational method of solving time-dependent Schrödinger equation would be of use to provide explanations on both ultrafast and chiroptical HHG spectroscopy of polyatomic molecules with certain handedness. © 2018 Elsevier B.V
URI
https://pr.ibs.re.kr/handle/8788114/5404
ISSN
0301-0104
Appears in Collections:
Center for Molecular Spectroscopy and Dynamics(분자 분광학 및 동력학 연구단) > Journal Papers (저널논문)
Files in This Item:
Effect of vibrational pre-excitation on_Dr. Borker(조민행).pdfDownload

qrcode

  • facebook

    twitter

  • Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.
해당 아이템을 이메일로 공유하기 원하시면 인증을 거치시기 바랍니다.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse