Exploration of strong-field double ionisation of a A₂B molecule in parallel and perpendicular laser fields

ABSTRACT

By using classical ensemble method, we investigate the double ionisation of a A₂B model molecule in parallel and perpendicular laser fields, respectively. We presented three two-electron model of A₂B molecule with different bond angles, respectively. The numerical results show that the double ionisation probability of A₂B model molecule is the same in parallel and perpendicular laser fields with bond angle π/3, but for the 2π/3 case, the double ionisation of the A₂B molecule in parallel field is larger than that in perpendicular case, and the difference becomes even larger of A₂B molecule with π case. Besides, the ‘finger-like’ structure along x-axis at about 150 TW/cm² is obvious with bond angle 2π/3 and π cases in the perpendicular electric field. The corresponding momentum distribution of A₂B molecule with different bond angles also presented in parallel and perpendicular laser fields, respectively. The above phenomenon are also demonstrated by analysing the energy distributions of double-ionised electrons versus time and corresponding trajectories.

KEYWORDS:

• Double ionisation
• parallel and perpendicular laser fields
• momentum distribution
• bond angle

Acknowledgements

This work was partial supported by National Natural Science Foundation of China under Grant Nos. 11574117, 11474129, and National Basic Research Program of China (973 Program, Grant No. 2013CB922200).

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

National Natural Science Foundation of China [grant number 11474129], [grant number 11574117]; National Basic Research Program of China [grant number 2013CB922200].