TY - JOUR
T1 - Selective bond breaking of CO2 in phase-locked two-color intense laser fields
T2 - Laser field intensity dependence
AU - Endo, Tomoyuki
AU - Fujise, Hikaru
AU - Kawachi, Yuuna
AU - Ishihara, Ayaka
AU - Matsuda, Akitaka
AU - Fushitani, Mizuho
AU - Kono, Hirohiko
AU - Hishikawa, Akiyoshi
N1 - Funding Information:
The authors are grateful to Yukio Sato for his theoretical contributions to the discussion on the asymmetric bond breaking mechanism of CO22+. The present study is partly supported by JSPS KAKENHI Grant Numbers 24245001, 24350006, 1632215, 16H04029, 16H04091 and by JSPS Program for Advancing Strategic International Networks to Accelerate the Circulation of Talented Researchers. T. E. acknowledges Grant-in-Aid for JSPS fellows (25·2966).
Publisher Copyright:
© the Owner Societies 2017.
PY - 2017
Y1 - 2017
N2 - Selective bond breaking of CO2 in phase-locked ω-2ω two-color intense laser fields (λ = 800 nm and 400 nm, total field intensity I ∼ 1014 W 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 × 1014 W cm-2, the largest fragment asymmetry is observed when the relative phase 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.
AB - Selective bond breaking of CO2 in phase-locked ω-2ω two-color intense laser fields (λ = 800 nm and 400 nm, total field intensity I ∼ 1014 W 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 × 1014 W cm-2, the largest fragment asymmetry is observed when the relative phase 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.
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U2 - 10.1039/c6cp07471e
DO - 10.1039/c6cp07471e
M3 - Article
AN - SCOPUS:85027265934
VL - 19
SP - 3550
EP - 3556
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
SN - 1463-9076
IS - 5
ER -