Separation of recollision mechanisms in nonsequential strong field double ionization of Ar:: The role of excitation tunneling -: art. no. 043003
Separation of recollision mechanisms in nonsequential strong field double ionization of Ar:: The role of excitation tunneling -: art. no. 043003
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DOI：
10.1103/physrevlett.87.043003
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发表时间：
2001-07-23
影响因子：
8.6
通讯作者：
Sandner, W
中科院分区：
文献类型：
--
作者：
Feuerstein, B;Moshammer, R;Sandner, W
用“反应显微镜”测量了波长为795 nm，脉宽为25 fs，脉宽为0.25PW/cm（2）的激光脉冲对Ar原子双电离产生的两个电子的矢量动量分布。“在这个强度下，非顺序电离占主导地位，在双电子动量分布中观察到不同的相关模式。在经典的“电离模型”的这些光谱的运动学分析揭示了一个（e，2 e）的过程和激发与随后的隧道的第二个电子作为两种不同的电离机制。这允许定性分离的两种机制，表明激发隧穿是占主导地位的贡献，总的双电离产率。
Vector momentum distributions of two electrons created in double ionization of Ar by 25 fs, 0.25 PW/cm(2) laser pulses at 795 nm have been measured using a "reaction microscope." At this intensity, where nonsequential ionization dominates, distinct correlation patterns are observed in the two-electron momentum distributions. A kinematical analysis of these spectra within the classical "recollision model" revealed an (e, 2e)-like process and excitation with subsequent tunneling of the second electron as two different ionization mechanisms. This allows a qualitative separation of the two mechanisms demonstrating that excitation-tunneling is the dominant contribution to the total double ionization yield.