Light-dressed states of polyatomic molecules in intense laser fields studied by coincidence momentum measurements

通过重合动量测量研究强激光场中多原子分子的光饰态

• 批准号: 13440122
• 负责人: HISHIKAWA Akiyoshi
• 金额: $ 7.62万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13440122/
• 关键词: Intense laser field; Coincidence momentum imaging; Coulomb explosion; Position sensitive detector; Momentum correlation; CS_2; コインシデンス週動量画像法; 位置敏感型イオン検出器; コインシデンス計測; 運動量測定; 分子構造変形

The three-body Coulomb explosion process of CS_2 in intense laser fields (〜 60 fs, 0.36x10^<15> W/cm^2), CS_2^<3+> → S^+ + C+ + S^+, is studied by the triple coincidence momentum imaging of the atomic fragment ions. The set of the observed momentum vectors of the fragment ions determined for respective explosion events exhibits a dear trajectory originating from the rotational motion of an intermediate CS^<2+> ion, formed in a sequential explosion process of CS_2^<3+> prior to the complete three-body fragmentation. The analysis based on the classical free-rotor model shows that the metastable CS2+ ion has a sufficiently longer lifetime than its rotational period (〜20ps). The molecular structure of CS_2^<3+> just before the Coulomb explosion is reconstructed from the average momentum values of the S^+ and C^+ ions produced through the concerted three-body Coulomb explosion pathways under the assumption that the potential between the fragments is Coulombic. The mean C-S bond length of <r> =2.5A and the azimuthally averaged S-C-S bond angle, <γ> = 145° thus determined indicate that structural deformation occurs to a large extent in the intense laser fields.

用原子碎片离子的三重符合动量成像研究了CS_2在强激光场中（0.36 × 10 ~（-6）fs，0.36 × 10 ~（-1<15>）W/cm ~ 2）的三体库仑爆炸过程：CS_2^&lt;3+&gt; → S^+ + C++ S^+。由各个爆炸事件所确定的碎片离子的动量矢量的集合显示出一个清晰的轨迹，该轨迹起源于一个中间CS^&lt;2+&gt;离子的旋转运动，该中间CS ^&lt;2 +&gt;离子形成于完整的三体碎裂之前的一个连续爆炸过程中。基于经典自由转子模型的分析表明，亚稳态的CS2+离子具有比其转动周期（~ 20 ps）足够长的寿命。在假定碎片间的势为库仑势的条件下，根据三体库仑爆炸过程中产生的S^+和C^+离子的平均动量值，重建了CS_2^&lt;3+&gt;在库仑爆炸前的分子结构。平均C-S键长<r>= 2.5和方位角平均S-C-S键角&lt;γ&gt; = 145°，表明在强激光场中发生了较大程度的结构变形。

项目成果

H.Hasegawa, A.Hishikawa, K.Yamanouchi: "Coincidence imaging of Coulomb explosion of CS_2 in intense laser fields"Chem. Phys. Lett.. 349. 57-63 (2001)

H.Hasekawa、A.Hishikawa、K.Yamanouchi：“强激光场中 CS_2 库仑爆炸的符合成像”Chem。

HISHIKAWA, Akiyoshi, HASEGAWA, Hirokazu, Kaoru Yamanouchi,: "Sequential three-body Coulomb explosion of CS2 in intense laser fields appearing in the momentum correlation map"Chemical Physics Letters. 361. 245 (2002)

HISHIKAWA、Akiyoshi、HASEGAWA、Hirokazu、Kaoru Yamanouchi，：“动量关联图中出现的强激光场中 CS2 的连续三体库仑爆炸”《化学物理快报》。

A.Hishikawa: "Sequential three-body Coulomb explosion of CS_2 in intense laser fields appearing in the momentum correlation map"Chemical Physics Letters. 361・3-4. 245-250 (2002)

A.Hishikawa：“动量相关图中出现的强激光场中的CS_2的连续三体库仑爆炸”《化学物理快报》361・3-4（2002）。

HASEGAWA, Hirokazu, HISHIKAWA, Akiyoshi, Kaoru Yamanouchi,: "Coincidence momentum imaging of the Coulomb explosion of CS_2 in intense laser fields"Chemical Physics Letters. 349. 57 (2001)

HASEGAWA、Hirokazu、HISHIKAWA、Akiyoshi、Kaoru Yamanouchi，：“强激光场中 CS_2 库仑爆炸的重合动量成像”《化学物理快报》。

H.Hasegawa: "Coincidence imaging of the Coulomb explosion of CS_2 in intense laser fields"Chemical Physics Letters. 349・1-2. 57-63 (2001)

H.Hasekawa：“强激光场中CS_2库仑爆炸的符合成像”《化学物理快报》349・1-63（2001）。