摘要
Integrated Stokes parameters Pi （i = 1, 2, 3） for the He 3 ^3p → 2 ^3S1 （388.9nm） transition after excitation from the ground state to the 3 3 p state by a transversely spin-polarized electron beam are measured in near threshold energy region. The experimental results are presented. The linear-polarization P2 are consistent with zero over the incident energy range, providing evidence for the LS coupling mechanism of the 3 ^3p state. The measured circular polarization P3 are non-zero, indicating strong electron-electron exchange effects in the spin-polarized electron-atom collision process.
Integrated Stokes parameters Pi （i = 1, 2, 3） for the He 3 ^3p → 2 ^3S1 （388.9nm） transition after excitation from the ground state to the 3 3 p state by a transversely spin-polarized electron beam are measured in near threshold energy region. The experimental results are presented. The linear-polarization P2 are consistent with zero over the incident energy range, providing evidence for the LS coupling mechanism of the 3 ^3p state. The measured circular polarization P3 are non-zero, indicating strong electron-electron exchange effects in the spin-polarized electron-atom collision process.
基金
Supported by the National Natural Science Foundation of China under Grant No 10134010.
