Photoelectron spectroscopy of 3s3p doubly excited helium dressed with strong near-infrared laser fields
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arXiv
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866917384148746240 |
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| author | Fushitani, Mizuho Liu, Chien-Nan Ono, Yuki Amaike, Shunsuke Yamazaki, Wataru Kato, Keiko Matsuda, Akitaka Owada, Shigeki Yabashi, Makina Hikosaka, Yasumasa Morishita, Toru Hishikawa, Akiyoshi |
| author_facet | Fushitani, Mizuho Liu, Chien-Nan Ono, Yuki Amaike, Shunsuke Yamazaki, Wataru Kato, Keiko Matsuda, Akitaka Owada, Shigeki Yabashi, Makina Hikosaka, Yasumasa Morishita, Toru Hishikawa, Akiyoshi |
| contents | We report time-resolved photoelectron spectroscopy of the $3s3p$ doubly excited states of helium dressed by an intense near-infrared (NIR) laser field. Using synchronized XUV free-electron-laser and 800-nm NIR laser pulses, we observe a pronounced delay-dependent shift of resonance-related spectral minima together with the emergence of additional structures around the NIR sideband energy. \textit{Ab initio} theoretical calculations support these observations and identify the features as signatures of NIR-induced coupling of the bright ($3s3p {}^{1}P^{o}$) autoionizing state to nearby dark ($^{1}D^{e}$ and $^{1}S^{e}$) resonances below the $N = 3$ threshold. A multichannel Fano resonance analysis of the measured spectra yields delay-dependent line-shape parameters and resonance energies, establishing a quantitative route to characterize and control correlated two-electron resonances in strong laser fields. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_03943 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Photoelectron spectroscopy of 3s3p doubly excited helium dressed with strong near-infrared laser fields Fushitani, Mizuho Liu, Chien-Nan Ono, Yuki Amaike, Shunsuke Yamazaki, Wataru Kato, Keiko Matsuda, Akitaka Owada, Shigeki Yabashi, Makina Hikosaka, Yasumasa Morishita, Toru Hishikawa, Akiyoshi Atomic Physics We report time-resolved photoelectron spectroscopy of the $3s3p$ doubly excited states of helium dressed by an intense near-infrared (NIR) laser field. Using synchronized XUV free-electron-laser and 800-nm NIR laser pulses, we observe a pronounced delay-dependent shift of resonance-related spectral minima together with the emergence of additional structures around the NIR sideband energy. \textit{Ab initio} theoretical calculations support these observations and identify the features as signatures of NIR-induced coupling of the bright ($3s3p {}^{1}P^{o}$) autoionizing state to nearby dark ($^{1}D^{e}$ and $^{1}S^{e}$) resonances below the $N = 3$ threshold. A multichannel Fano resonance analysis of the measured spectra yields delay-dependent line-shape parameters and resonance energies, establishing a quantitative route to characterize and control correlated two-electron resonances in strong laser fields. |
| title | Photoelectron spectroscopy of 3s3p doubly excited helium dressed with strong near-infrared laser fields |
| topic | Atomic Physics |
| url | https://arxiv.org/abs/2604.03943 |