Role of the Permanent Dipole Moment in Coulomb Explosion
ZHANG Cai-Ping, MIAO Xiang-Yang**
College of Physics and Information Engineering, Shanxi Normal University, Linfen 041004
Abstract ：By numerically solving the non-Born–Oppenheimer time-dependent Schr?dinger equation in a few-cycle chirped laser field (5-fs, 800-nm), the effect of the permanent dipole moment on the Coulomb explosion is studied by the kinetic-energy-release spectra with the "virtual detector" method. The results indicate that with the effect of the permanent dipole moment, different multiphoton processes for heteronuclear and homonuclear diatomic molecular ions may take place when the wave packets transit from the ground state (1sσg ) to the first excited state (2pσu ), and then move along the excited potential curve, and finally charge-resonant enhanced ionization occurs at critical internuclear distance. As a result, despite the similar ionization probabilities for these two systems at higher vibrational level with larger chirp parameter β , the structure of the Coulomb explosion spectrum for the former is prominently different from that for the latter.
收稿日期: 2013-05-29
出版日期: 2013-11-21
:
31.15.xv
(Molecular dynamics and other numerical methods)
79.77.+g
(Coulomb explosion)
33.20.Tp
(Vibrational analysis)
33.80.Rv
(Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states))
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