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2025 Volume 34 Issue 5

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Jie Liu(刘洁), Yong-Kang Zhang(张永康), and Xiao-Lei Hao(郝小雷)†. 2025: Alignment-dependent ionization of molecules in near-circularly polarized intense laser fields, Chinese Physics B, 34(5): 053201. doi: 10.1088/1674-1056/adbdc2

Citation:

Jie Liu(刘洁), Yong-Kang Zhang(张永康), and Xiao-Lei Hao(郝小雷)†. 2025: Alignment-dependent ionization of molecules in near-circularly polarized intense laser fields, Chinese Physics B, 34(5): 053201. doi: 10.1088/1674-1056/adbdc2

Alignment-dependent ionization of molecules in near-circularly polarized intense laser fields

Institute of Theoretical Physics, State Key Laboratory of Quantum Optics Technologies and Devices, Shanxi University, Taiyuan 030006, China

Received Date: 23/01/2025
Accepted Date: 27/02/2025
Fund Project:
Project supported by the National Natural Science Foundation of China (Grant No. 12274273).
PACS: 32.80.Rm; 33.20.Xx; 33.80.Rv; 33.80.-b

Abstract

The alignment-dependent photoelectron spectrum is a valuable tool for mapping out the electronic structure of molecular orbitals. However, this approach may not be applicable to all molecules, such as CO$_{2}$, as the ionization process in a linearly polarized laser field involves contributions from orbitals other than the highest occupied molecular orbital (HOMO). Here, we conducted a theoretical investigation into the ionization process of N$_{2}$ and CO$_{2}$ in near-circularly polarized laser field using the Coulomb-corrected strong-field approximation (CCSFA) method for molecules. In particular, we introduced a generalized dressed state into the CCSFA method in order to account for the impact of the laser field on the molecular initial state. The simulated alignment-dependent photoelectron momentum distribution (PMD) of the two molecules exhibited markedly disparate behaviors, which were in excellent agreement with the previous experimental observations reported in [Phys. Rev. A 102, 013117 (2020)]. Our findings indicate that under a near-circularly polarized laser field, the alignment-dependent PMD of molecules is primarily sourced from the HOMO, in contrast to the situation under a linearly polarized laser field. Moreover, a satisfactory correlation between the alignment-dependent angular distribution and the orbital symmetry was observed, which suggests an effective approach for molecular orbital imaging.
- alignment,
- Coulomb-corrected strong-field approximation (CCSFA),
- photoelectron momentum distribution (PMD),
- image

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

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Alignment-dependent ionization of molecules in near-circularly polarized intense laser fields

Received Date: 23/01/2025
Accepted Date: 27/02/2025

Fund Project:

Key words:

alignment /
Coulomb-corrected strong-field approximation (CCSFA) /
photoelectron momentum distribution (PMD) /
image

Abstract: The alignment-dependent photoelectron spectrum is a valuable tool for mapping out the electronic structure of molecular orbitals. However, this approach may not be applicable to all molecules, such as CO$_{2}$, as the ionization process in a linearly polarized laser field involves contributions from orbitals other than the highest occupied molecular orbital (HOMO). Here, we conducted a theoretical investigation into the ionization process of N$_{2}$ and CO$_{2}$ in near-circularly polarized laser field using the Coulomb-corrected strong-field approximation (CCSFA) method for molecules. In particular, we introduced a generalized dressed state into the CCSFA method in order to account for the impact of the laser field on the molecular initial state. The simulated alignment-dependent photoelectron momentum distribution (PMD) of the two molecules exhibited markedly disparate behaviors, which were in excellent agreement with the previous experimental observations reported in [Phys. Rev. A 102, 013117 (2020)]. Our findings indicate that under a near-circularly polarized laser field, the alignment-dependent PMD of molecules is primarily sourced from the HOMO, in contrast to the situation under a linearly polarized laser field. Moreover, a satisfactory correlation between the alignment-dependent angular distribution and the orbital symmetry was observed, which suggests an effective approach for molecular orbital imaging.

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