Institut für Kernphysik, Goethe-Universität, Max-von-Laue-Strasse 1, 60438 Frankfurt, Germany.
Phys Rev Lett. 2018 Jan 26;120(4):043202. doi: 10.1103/PhysRevLett.120.043202.
The spin polarization of electrons from multiphoton ionization of Xe by 395 nm circularly polarized laser pulses at 6×10^{13} W/cm^{2} has been measured. At this photon energy of 3.14 eV the above-threshold ionization peaks connected to Xe^{+} ions in the ground state (J=3/2, ionization potential I_{p}=12.1 eV) and the first excited state (J=1/2, I_{p}=13.4 eV) are clearly separated in the electron energy distribution. These two combs of above-threshold ionization peaks show opposite spin polarizations. The magnitude of the spin polarization is a factor of 2 higher for the J=1/2 than for the J=3/2 final ionic state. In turn, the data show that the ionization probability is strongly dependent on the sign of the magnetic quantum number.
采用 6×10^{13} W/cm^{2} 的 395nm 圆偏振激光脉冲多光子电离 Xe 产生的电子自旋极化已被测量。在 3.14eV 的光子能量下，与基态 (J=3/2, 电离能 I_{p}=12.1 eV) 和第一激发态 (J=1/2, I_{p}=13.4 eV) Xe^{+}离子相连的阈上电离峰在电子能量分布中明显分开。这两个阈上电离峰的组合呈现出相反的自旋极化。对于 J=1/2 的终离子态，自旋极化的幅度比 J=3/2 的终离子态高 2 倍。反过来，数据表明电离概率强烈依赖于磁量子数的符号。
