title: Frequency-resolved optical gating technique for retrieving the amplitude of a vibrational wavepacket.
abstract: We propose a novel method to determine the complex amplitude of each eigenfunction composing a vibrational wavepacket of / molecular ions evolving with a ~10 fs time scale. We find that the two-dimensional spectrogram of the kinetic energy release (KER) of H(+)/D(+) fragments plotted against the time delay of the probe pulse is equivalent to the spectrogram used in the frequency-resolved optical gating (FROG) technique to retrieve the complex amplitude of an ultrashort optical pulse. By adapting the FROG algorithm to the delay-KER spectrogram of the vibrational wavepacket, we have successfully reconstructed the complex amplitude. The deterioration in retrieval accuracy caused by the bandpass filter required to process actual experimental data is also discussed.
authors.affiliation: Attosecond Science Research Team, RIKEN Center for Advanced Photonics (RAP), 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan.
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Nabekawa
authors.affiliation: Attosecond Science Research Team, RIKEN Center for Advanced Photonics (RAP), 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan.
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Furukawa
authors.affiliation: Attosecond Science Research Team, RIKEN Center for Advanced Photonics (RAP), 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan.
authors.forename: Tomoya
authors.initials: T
authors.lastname: Okino
authors.affiliation: Attosecond Science Research Team, RIKEN Center for Advanced Photonics (RAP), 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Amani Eilanlou
authors.affiliation: Attosecond Science Research Team, RIKEN Center for Advanced Photonics (RAP), 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan.
authors.forename: Eiji J
authors.initials: EJ
authors.lastname: Takahashi
authors.affiliation: Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.
authors.forename: Kaoru
authors.initials: K
authors.lastname: Yamanouchi
authors.affiliation: Attosecond Science Research Team, RIKEN Center for Advanced Photonics (RAP), 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan.
authors.forename: Katsumi
authors.initials: K
authors.lastname: Midorikawa