Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Response of Water Tetramer to Intense Femtosecond Laser Pulses

  • Wang, Zhiping (Department of Fundamental Courses, Wuxi Institute of Technology) ;
  • Xu, Xuefen (Department of Fundamental Courses, Wuxi Institute of Technology) ;
  • Qian, Chaoyi (Department of Fundamental Courses, Wuxi Institute of Technology) ;
  • Wang, Yanbiao (Department of Fundamental Courses, Wuxi Institute of Technology) ;
  • Wang, Xu (Department of Fundamental Courses, Wuxi Institute of Technology)
  • Received : 2016.10.12
  • Accepted : 2017.05.18
  • Published : 2017.08.25
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Abstract

We theoretically study the dynamics of water tetramer in intense femtosecond laser pulses with different frequencies. The simulations are carried out by incorporating the molecular dynamics method non-adiabatically into the time-dependent local-density approximation (TDLDA-MD). Three typical scenarios of water tetramer including the normal vibration with enlarged OH bonds, free OH bonds breaking and the pure Coulomb explosion are presented by investigating the electronic and ionic dynamics. The result indicates that the ionization is enhanced and the corresponding fragmentation effect as well as the damping of the dipole moment are found more notably when increasing the laser frequency especially when the frequency falls in the resonant region of the absorption spectra. The study of the level depletion reveals that the ratio of the emission amount from different levels can be controlled by changing the laser frequency referring to the Keldysh parameter.

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