Retrieving photorecombination cross sections of atoms from high-order harmonic spectra
Retrieving photorecombination cross sections of atoms from high-order harmonic spectra
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DOI：
10.1103/physreva.78.061402
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发表时间：
2008-12-01
影响因子：
2.9
通讯作者：
Sakai, Hirofumi
中科院分区：
文献类型：
--
作者：
Minemoto, Shinichirou;Umegaki, Toshihito;Sakai, Hirofumi
我们观察了薄原子介质Ar、Kr和Xe在800 nm和1300 nm飞秒强脉冲作用下产生的高次谐波光谱。在谐波光谱中观察到单原子响应的明显特征。特别是在Ar的情况下，在谐波谱中观察到反映原子电子结构的库珀最小值。我们借助精确的回碰撞电子波包成功地提取了原子在无场条件下的光复合截面。本方案为探索分子动力学的阿秒分辨率超快成像铺平了道路。
We observe high-order harmonic spectra generated from a thin atomic medium, Ar, Kr, and Xe, by intense 800-nm and 1300-nm femtosecond pulses. A clear signature of a single-atom response is observed in the harmonic spectra. Especially in the case of Ar, a Cooper minimum, reflecting the electronic structure of the atom, is observed in the harmonic spectra. We successfully extract the photorecombination cross sections of the atoms in the field-free condition with the help of an accurate recolliding electron wave packet. The present protocol paves the way for exploring ultrafast imaging of molecular dynamics with attosecond resolution.