High-Order Above-Threshold Ionization of H2+ in Intense Laser Field
GUO Ying-Chun1,2, FU Pan-Ming1, WANG Bing-Bing1
1Laboratory of Optical Physics, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 1000802State Key Laboratory of Precision Spectroscopy, Department ofPhysics, East China Normal University, Shanghai 200062
High-Order Above-Threshold Ionization of H2+ in Intense Laser Field
GUO Ying-Chun1,2, FU Pan-Ming1, WANG Bing-Bing1
1Laboratory of Optical Physics, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 1000802State Key Laboratory of Precision Spectroscopy, Department ofPhysics, East China Normal University, Shanghai 200062
摘要The nonperturbative quantum electrodynamics method proposed by Fu et al. [Phys. Rev. A 75 (2007) 063419] is employed to study the high-order above-threshold ionization (ATI) of a diatomic molecule. Based on this frequency-domain theory, the high-order ATI process can be regarded as ATI followed by laser-assisted collision, where the total transition amplitude is the coherent summation of the contributions from each ATI channel. The angular-resolved ATI spectrum, which agrees with the results by Becker et al. based on the time-domain method, is obtained by this frequency domain theory. Furthermore, it is demonstrated that the interference characteristics representing the molecular structure in the ATI spectrum originates from the recollision of the electron with two-centre ion in each ATI channel.
Abstract：The nonperturbative quantum electrodynamics method proposed by Fu et al. [Phys. Rev. A 75 (2007) 063419] is employed to study the high-order above-threshold ionization (ATI) of a diatomic molecule. Based on this frequency-domain theory, the high-order ATI process can be regarded as ATI followed by laser-assisted collision, where the total transition amplitude is the coherent summation of the contributions from each ATI channel. The angular-resolved ATI spectrum, which agrees with the results by Becker et al. based on the time-domain method, is obtained by this frequency domain theory. Furthermore, it is demonstrated that the interference characteristics representing the molecular structure in the ATI spectrum originates from the recollision of the electron with two-centre ion in each ATI channel.
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2009, Vol. 26 
