Decoding strong-field ionization of H 2 via photoelectron momentum torus
Year: 2025
Type: article
Abstract: Strong-field ionization of H 2 in circularly polarized laser fields (1035 nm, 35 fs, ∼ 1 × 10 14 W / cm 2 ) has been studied by three-dimensional electron-ion coincidence momentum imaging. Both the effective ionization potential and the applied laser electric field amplitude are simultaneously determined from the parameters characterizing the tunnel-electron torus in momentum space, using the adiabatic theory of strong-field ionization extended to include higher-order nonadiabatic effects as a reference. The effective ionization potential of H 2 , obtained with an accuracy and precision of 10 − 2 a.u., reveals a clear shift from the field-free value. Dependence on both the field amplitude and the ionization pathways to H 2 + and H + + H is also resolved. These findings demonstrate that the target-specific properties can be quantitatively decoded from the structure of the photoelectron momentum torus, thus establishing a basis for quantitative ultrafast tunnel-electron spectroscopy.
Source: Physical Review Research
DOI: 10.1103/g7g6-mm4z
Authors: Daimu Ikeya, Hikaru Fujise, Minami Takahashi, Kyoichiro Yasui, Akitaka Matsuda, Mizuho Fushitani, Hirokazu Matsui, Hiroka Hasegawa, Oleg I. Tolstikhin, Toru Morishita, Akiyoshi Hishikawa
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,625
Awards: 超高速分子イメージングに向けたレーザートンネル電子分光法の構築, G207224403, G2939100968, Developing electron-dynamics imaging methods by laser-tunneling electron momentum measurements, Development of chirality detection methods using intense laser field circular dichroism, G3660632507, Quantum theory for high-order harmonic generation of atoms and molecules irradiated by intense laser pulses, Development of electron dynamics imaging technique based on understanding of laser tunneling ionization process
OpenAlex ID: W7081926241