Electronic State Population Dynamics upon Ultrafast Strong Field Ionization and Fragmentation of Molecular Nitrogen
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , , , , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2024
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866929495998464000 |
|---|---|
| author | Kleine, Carlo Winghart, Marc-Oliver Zhang, Zhuang-Yan Richter, Maria Ekimova, Maria Eckert, Sebastian Vrakking, Marc J. J. Nibbering, Erik T. J. Rouzee, Arnaud Grant, Edward R. |
| author_facet | Kleine, Carlo Winghart, Marc-Oliver Zhang, Zhuang-Yan Richter, Maria Ekimova, Maria Eckert, Sebastian Vrakking, Marc J. J. Nibbering, Erik T. J. Rouzee, Arnaud Grant, Edward R. |
| contents | Air-lasing from single ionized N$_2^+$ molecules induced by laser filamentation in air has been intensively investigated and the mechanisms responsible for lasing are currently highly debated. We use ultrafast nitrogen K-edge spectroscopy to follow the strong field ionization and fragmentation dynamics of N$_2$ upon interaction with an ultrashort 800 nm laser pulse. Using probe pulses generated by extreme high-order harmonic generation, we observe transitions indicative of the formation of the electronic ground X$^2Σ_{g}^{+}$, first excited A$^2Π_u$ and second excited B$^2Σ^+_u$ states of N$_2^+$ on femtosecond time scales, from which we can quantitatively determine the time-dependent electronic state population distribution dynamics of N$_2^+$. Our results show a remarkably low population of the A$^2Π_u$ state, and nearly equal populations of the X$^2Σ_{g}^{+}$ and B$^2Σ^+_u$ states. In addition, we observe fragmentation of N$_2^+$ into N and N$^+$ on a time scale of several tens of picoseconds that we assign to significant collisional dynamics in the plasma, resulting in dissociative excitation of N$_2^+$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_06757 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Electronic State Population Dynamics upon Ultrafast Strong Field Ionization and Fragmentation of Molecular Nitrogen Kleine, Carlo Winghart, Marc-Oliver Zhang, Zhuang-Yan Richter, Maria Ekimova, Maria Eckert, Sebastian Vrakking, Marc J. J. Nibbering, Erik T. J. Rouzee, Arnaud Grant, Edward R. Atomic Physics Chemical Physics Air-lasing from single ionized N$_2^+$ molecules induced by laser filamentation in air has been intensively investigated and the mechanisms responsible for lasing are currently highly debated. We use ultrafast nitrogen K-edge spectroscopy to follow the strong field ionization and fragmentation dynamics of N$_2$ upon interaction with an ultrashort 800 nm laser pulse. Using probe pulses generated by extreme high-order harmonic generation, we observe transitions indicative of the formation of the electronic ground X$^2Σ_{g}^{+}$, first excited A$^2Π_u$ and second excited B$^2Σ^+_u$ states of N$_2^+$ on femtosecond time scales, from which we can quantitatively determine the time-dependent electronic state population distribution dynamics of N$_2^+$. Our results show a remarkably low population of the A$^2Π_u$ state, and nearly equal populations of the X$^2Σ_{g}^{+}$ and B$^2Σ^+_u$ states. In addition, we observe fragmentation of N$_2^+$ into N and N$^+$ on a time scale of several tens of picoseconds that we assign to significant collisional dynamics in the plasma, resulting in dissociative excitation of N$_2^+$. |
| title | Electronic State Population Dynamics upon Ultrafast Strong Field Ionization and Fragmentation of Molecular Nitrogen |
| topic | Atomic Physics Chemical Physics |
| url | https://arxiv.org/abs/2409.06757 |