Loh Zhi-Heng, Khalil Munira, Correa Raoul E, Santra Robin, Buth Christian, Leone Stephen R
Department of Chemistry and Physics, University of California, Berkeley, California 94720, USA.
Phys Rev Lett. 2007 Apr 6;98(14):143601. doi: 10.1103/PhysRevLett.98.143601. Epub 2007 Apr 5.
Femtosecond high-order harmonic transient absorption spectroscopy is used to resolve the complete |j,m quantum state distribution of Xe+ produced by optical strong-field ionization of Xe atoms at 800 nm. Probing at the Xe N4/5 edge yields a population distribution rhoj,|m| of rho3/2,1/2ratiorho1/2,1/2ratiorho3/2,3/2=75+/-6 :12+/-3 :13+/-6%. The result is compared to a tunnel ionization calculation with the inclusion of spin-orbit coupling, revealing nonadiabatic ionization behavior. The sub-50-fs time resolution paves the way for tabletop extreme ultraviolet absorption probing of ultrafast dynamics.
飞秒高次谐波瞬态吸收光谱用于解析在800nm处对Xe原子进行光强场电离所产生的Xe⁺的完整|j,m|量子态分布。在Xe N4/5边缘进行探测得到的布居分布ρj,|m|为ρ3/2,1/2:ρ1/2,1/2:ρ3/2,3/2 = 75±6 : 12±3 : 13±6%。将该结果与包含自旋 - 轨道耦合的隧道电离计算结果进行比较，揭示了非绝热电离行为。低于50飞秒的时间分辨率为超快动力学的桌面极紫外吸收探测铺平了道路。
