Ren Xianghe, Zhang Jingtao, Xu Zhizhan, Guo D-S
College of Sciences, Shandong Polytechnic University, Jinan, China.
Opt Express. 2011 Dec 5;19(25):24858-70. doi: 10.1364/OE.19.024858.
The half Kapitza-Dirac effect of H2+ molecule in an intense standing-wave laser field is studied with a focus on the influence of the molecular orbital symmetry and the molecular alignment on the photo-electron angular distributions (PADs). In standing-wave laser fields, the PADs split along the scattering angle due to the momentum change of electron with photons when it escapes from the laser fields. The structures and the symmetry of PADs are severely affected by the molecular orbital symmetry and the molecular alignment. For H2+ molecule in ground state (σg), the PADs are severely changed by the molecular alignment only when the photoelectron kinetic energy is sufficiently high. For H2+ molecule in the first excited state (σμ), the molecular alignment distinctively changes the PADs, irrelevant to the kinetic energy of photoelectrons. When the molecules are aligned either parallel with or perpendicular to the laser polarization, the PADs are symmetric about an axis. In other cases, the PADs do not show any symmetry. These results indicate that the molecular alignment can be used to control the splitting in the half Kapitza-Dirac effect.
研究了H₂⁺分子在强驻波激光场中的半卡皮察-狄拉克效应，重点关注分子轨道对称性和分子取向对光电子角分布（PADs）的影响。在驻波激光场中，当电子从激光场逃逸时，由于电子与光子的动量变化，PADs会沿散射角分裂。PADs的结构和对称性受到分子轨道对称性和分子取向的严重影响。对于基态（σg）的H₂⁺分子，只有当光电子动能足够高时，分子取向才会严重改变PADs。对于第一激发态（σμ）的H₂⁺分子，分子取向显著改变PADs，与光电子的动能无关。当分子与激光偏振平行或垂直排列时，PADs关于一个轴对称。在其他情况下，PADs不显示任何对称性。这些结果表明，分子取向可用于控制半卡皮察-狄拉克效应中的分裂。
