title: Selective bond breaking of CO2in phase-locked two-color intense laser fields: laser field intensity dependence.
abstract: Selective bond breaking of CO2in phase-locked ω-2ω two-color intense laser fields (λ = 800 nm and 400 nm, total field intensity I ∼ 1014W cm-2) has been investigated by coincidence momentum imaging. The CO+and O+fragment ions produced by two-body Coulomb explosion, CO22+→ CO++ O+, exhibit asymmetric distributions along the laser polarization direction, showing that one of the two equivalent C-O bonds is selectively broken by the laser fields. At a field intensity higher than 2 × 1014W cm-2, the largest fragment asymmetry is observed when the relative phase ϕ between the ω and 2ω laser fields is ∼0 and π. On the other hand, an increase of the asymmetry and a shift of the phase providing the largest asymmetry are observed at lower field intensities. The selective bond breaking and its dependence on the laser field intensity are discussed in terms of a mechanism involving deformation of the potential energy surfaces and electron recollision in intense laser fields.
authors.affiliation: Research Center for Materials Science, Nagoya University, Furo-cho, Chikusa, Nagoya, Aichi 464-8602, Japan. hishi@chem.nagoya-u.ac.jp and Department of Chemistry, Graduate School of Science, Nagoya University, Furo-cho, Chikusa, Nagoya, Aichi 464-8602, Japan.
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Endo
authors.affiliation: Department of Chemistry, Graduate School of Science, Nagoya University, Furo-cho, Chikusa, Nagoya, Aichi 464-8602, Japan.
authors.forename: Hikaru
authors.initials: H
authors.lastname: Fujise
authors.affiliation: Department of Chemistry, Graduate School of Science, Nagoya University, Furo-cho, Chikusa, Nagoya, Aichi 464-8602, Japan.
authors.forename: Yuuna
authors.initials: Y
authors.lastname: Kawachi
authors.affiliation: Department of Chemistry, Graduate School of Science, Nagoya University, Furo-cho, Chikusa, Nagoya, Aichi 464-8602, Japan.
authors.forename: Ayaka
authors.initials: A
authors.lastname: Ishihara
authors.affiliation: Department of Chemistry, Graduate School of Science, Nagoya University, Furo-cho, Chikusa, Nagoya, Aichi 464-8602, Japan.
authors.forename: Akitaka
authors.initials: A
authors.lastname: Matsuda
authors.affiliation: Department of Chemistry, Graduate School of Science, Nagoya University, Furo-cho, Chikusa, Nagoya, Aichi 464-8602, Japan.
authors.forename: Mizuho
authors.initials: M
authors.lastname: Fushitani
authors.affiliation: Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan.
authors.forename: Hirohiko
authors.initials: H
authors.lastname: Kono
authors.affiliation: Research Center for Materials Science, Nagoya University, Furo-cho, Chikusa, Nagoya, Aichi 464-8602, Japan. hishi@chem.nagoya-u.ac.jp and Department of Chemistry, Graduate School of Science, Nagoya University, Furo-cho, Chikusa, Nagoya, Aichi 464-8602, Japan.
authors.forename: Akiyoshi
authors.identifier: http://orcid.org/0000-0002-4147-294X
authors.initials: A
authors.lastname: Hishikawa