Picosecond imaging of dynamics of solvated electrons during femtosecond laser-induced plasma generation in water
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866929731705765888 |
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| author | Sakakibara, Noritaka Ito, Tsuyohito Hakuta, Yukiya Shimizu, Yoshiki Terashima, Kazuo Miura, Eisuke |
| author_facet | Sakakibara, Noritaka Ito, Tsuyohito Hakuta, Yukiya Shimizu, Yoshiki Terashima, Kazuo Miura, Eisuke |
| contents | The dynamics of solvated electrons were visualized using absorption imaging with sub-picosecond time resolution based on a pump-probe measurement during the early stages of femtosecond laser-induced plasma generation in water. The solvated electrons were generated by the propagation of a femtosecond laser pump pulse. In the area with a pump laser intensity over 2x10^13 W/cm2, where a high density of free electrons was produced, solvated electrons exhibited an additional rapid increase in optical density (OD) at 800 nm, 7-9 ps after the pump pulse excitation. In contrast, no two-step increase in OD was observed when probed at 400 nm, suggesting that the absorption coefficient of the solvated electrons rapidly changed around 800 nm after femtosecond laser excitation for a few picoseconds. This observation might indicate the structural and electronic modulation of solvated electrons owing to the high density of free electrons in water, accompanied by femtosecond-laser-induced plasma generation. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2502_18169 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Picosecond imaging of dynamics of solvated electrons during femtosecond laser-induced plasma generation in water Sakakibara, Noritaka Ito, Tsuyohito Hakuta, Yukiya Shimizu, Yoshiki Terashima, Kazuo Miura, Eisuke Chemical Physics Plasma Physics The dynamics of solvated electrons were visualized using absorption imaging with sub-picosecond time resolution based on a pump-probe measurement during the early stages of femtosecond laser-induced plasma generation in water. The solvated electrons were generated by the propagation of a femtosecond laser pump pulse. In the area with a pump laser intensity over 2x10^13 W/cm2, where a high density of free electrons was produced, solvated electrons exhibited an additional rapid increase in optical density (OD) at 800 nm, 7-9 ps after the pump pulse excitation. In contrast, no two-step increase in OD was observed when probed at 400 nm, suggesting that the absorption coefficient of the solvated electrons rapidly changed around 800 nm after femtosecond laser excitation for a few picoseconds. This observation might indicate the structural and electronic modulation of solvated electrons owing to the high density of free electrons in water, accompanied by femtosecond-laser-induced plasma generation. |
| title | Picosecond imaging of dynamics of solvated electrons during femtosecond laser-induced plasma generation in water |
| topic | Chemical Physics Plasma Physics |
| url | https://arxiv.org/abs/2502.18169 |