Vibrational wave packet dynamics of H2O+ and H2O by strong-field Fourier transform spectroscopy

• Published in: Chemical physics letters Vol. 805; p. 139941
• Main Authors: Kageyama, Hiroyuki, Szidarovszky, Tamás, Ando, Toshiaki, Iwasaki, Atsushi, Császár, Attila G., Yamanouchi, Kaoru
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 16.10.2022
• ISSN: 0009-2614; 1873-4448
• DOI: 10.1016/j.cplett.2022.139941

[Display omitted] •Vibrational dynamics of H2O and H2O+ is probed in real time by intense laser pulses.•Time-dependent yields of H2O+ and two-body breakup of H2O2+ are Fourier transformed.•Frequencies and initial phases of the vibrational modes of H2O and H2O+ are obtained.•High-accuracy vibrational quantum dynamics is simulated to explain the observed data.•Utility of strong-field pump-and-probe Fourier-transform spectroscopy demonstrated. The vibrational wave packet dynamics of H2O+ and H2O are investigated by pump–probe measurements using few-cycle intense laser pulses. By a Fourier transform (FT) of the time-dependent yields of the two-body Coulomb explosion pathway, H2O2+ → H+ + OH+, and the parent ion, H2O+, the vibrational excitation processes in the electronic ground states of H2O+ and H2O induced by the intense laser field are retrieved from the phases of the respective vibrational peaks in the FT spectrum. Accurate quantum-dynamics simulations on H2O+ confirm both the peak assignment and the origin of the time-dependent ionization yields of the vibrational wave packet.