title: Neutral dissociation of superexcited oxygen molecules in intense laser fields.
abstract: Superexcited states (SESs) of oxygen molecules and their neutral dissociation processes have been studied both experimentally and theoretically using intense femtosecond laser. We find that at the laser intensity of approximately 2 x 10(14) W/cm(2), ultrashort laser pulse causes neutral dissociation of oxygen molecule by way of SESs. The dissociation products are the excited neutral oxygen atoms, which are observed through fluorescence spectroscopy. Laser power dependence of the fluorescence intensity shows that each molecule effectively absorbs an average of ten laser photons. The total energy absorbed is sufficient to stimulate the molecule to many of the SESs. The effect is equivalent to single photon excitation in the extreme-ultraviolet (XUV) region by synchrotron radiation (SR). Morse potential energy curves (PECs) are constructed for the SESs of O(2) molecules. In light of the PECs, predissociation mechanism is proposed for the neutral dissociation. Quasi-classical trajectory (QCT) calculations show that the predissociation time is as short as 100 fs, which is consistent with our experimental measurement using ultrafast pump-probe technique.
authors.affiliation: Institute of Chemistry, Chinese Academy of Science, Beijing 100190, People's Republic of China.
authors.forename: Di
authors.initials: D
authors.lastname: Song
authors.forename: Ali
authors.initials: A
authors.lastname: Azarm
authors.forename: Yousef
authors.initials: Y
authors.lastname: Kamali
authors.forename: Kai
authors.initials: K
authors.lastname: Liu
authors.forename: Andong
authors.initials: A
authors.lastname: Xia
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Teranishi
authors.forename: Sheng-Hsien
authors.initials: SH
authors.lastname: Lin
authors.forename: Fanao
authors.initials: F
authors.lastname: Kong
authors.forename: See Leang
authors.initials: SL
authors.lastname: Chin