Helicity-dependent dissociative tunneling ionization of CF<sub>4</sub> in multicycle circularly polarized intense laser fields
Helicity-dependent dissociative tunneling ionization of CF<sub>4</sub> in multicycle circularly polarized intense laser fields
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多周期圆偏振强激光场中 CF<sub>4</sub> 螺旋度依赖性解离隧道电离
DOI：
10.1039/d1cp05858d
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发表时间：
2022
影响因子：
3.3
通讯作者：
Hishikawa A.
中科院分区：
文献类型：
--
作者：
Fujise H.;Uemura M.;Hasegawa H.;Ikeya D.;Matsuda A.;Morishita T.;Madsen L. B.;Jensen F.;Tolstikhin O. I.;Hishikawa A.
利用三维电子-离子符合动量成像研究了圆偏振超短强激光场（35 fs，0.8 × 1014 W cm-2，1035 nm）中四氟甲烷（CF 4）的解离隧道电离，CF 4 → CF 4 + + e-→ CF 3 + + F + e-。反冲坐标系中的光电子角分布表明，当激光电场从F指向C时，隧道电离发生得很好。所得到的结果与弱场渐近理论（WFAT）分别从最高和次高占据分子轨道HOMO（1 t1）和HOMO−1（4 t2）隧穿电离的理论预测定性一致。另一方面，角分布显示出明显的依赖于偏振螺旋度，表明C-F键的断裂是敏感的多波长圆偏振激光场的螺旋度。
Dissociative tunneling ionization of tetrafluoromethane (CF4) in circularly polarized ultrashort intense laser fields (35 fs, 0.8 × 1014 W cm−2, 1035 nm), CF4 → CF4+ + e− → CF3+ + F + e−, has been studied by three-dimensional electron–ion coincidence momentum imaging. The photoelectron angular distribution in the recoil frame revealed that the dissociative tunneling ionization occurs efficiently when the laser electric field points from F to C. The obtained results are qualitatively consistent with the theoretical predictions by the weak-field asymptotic theory (WFAT) for tunneling ionization from the highest and next-highest occupied molecular orbitals, HOMO (1t1), and HOMO−1 (4t2), respectively. On the other hand, the angular distribution shows clear dependences on the polarization helicity, indicating that the breaking of the C–F bonds is sensitive to the helicity of the multicycle circularly polarized laser fields.