Sequential two-photon double ionization of the 4d shell in xenon
Sequential two-photon double ionization of the 4d shell in xenon
复制标题
DOI：
10.1088/0953-4075/44/17/175602
复制
发表时间：
2011-08
期刊：
影响因子：
--
通讯作者：
S. Fritzsche;A. Grum-Grzhimailo;E. Gryzlova;N. M. Kabachnik
中科院分区：
文献类型：
--
作者：
S. Fritzsche;A. Grum-Grzhimailo;E. Gryzlova;N. M. Kabachnik
本文研究了氙原子4d电子在强自由电子激光（FEL）辐射下，光子能量为70-200 eV的连续双光子双电离过程。在这些能量下，自由电子激光器FLASH可以提供，4D光电离在价壳层的电离中占主导地位，显示出巨大的共振。第一个光子产生的4d空位强烈耦合到（俄歇）自电离连续谱，其寿命仅为1.6fs，因此在典型的自由电子激光脉冲中，俄歇衰变与第二个光电离竞争。研究了光电子角分布和发射电子之间的角关联，并将其与光电离和俄歇衰变的特殊4d特征联系起来。
The sequential two-photon double ionization of 4d electrons of xenon in intense free-electron laser (FEL) radiation is theoretically investigated for photon energies of 70–200 eV. At these energies, which are available at the free-electron laser FLASH, the 4d photoionization dominates over the ionization of the valence shells, showing a giant resonance. The 4d vacancy produced by the first photon strongly couples to the (Auger) autoionization continuum with a lifetime of only ∼6 fs and thus the Auger decay competes with the second photoionization in a typical FEL pulse. The photoelectron angular distributions and angular correlation between emitted electrons are investigated as associated with the peculiar 4d character of the photoionization and Auger decay.