Association between projectile and target excitation in slow Ar$^{q+}$-CO$_2$ collisions
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
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2026
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| _version_ | 1866917398964076544 |
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| author | Srivastav, Akash Srivastav, Sumit P, Vishnu Bapat, Bhas |
| author_facet | Srivastav, Akash Srivastav, Sumit P, Vishnu Bapat, Bhas |
| contents | We investigate ionic fragmentation of CO$_2^{n+}$~\mbox{($2\le n\le 4$)} produced in collisions with Ar$^{q+}$~\mbox{($4\le q\le 16$)} projectiles at a collision velocity of $\approx$~0.3~a.u. For most projectile and fragmentation channel combinations, the shape of the kinetic energy release distribution (KERD) differs with the electron capture mediated charge change (\mbox{$Δq$}) in the scattered projectile: KERD for \mbox{$Δq = 2$} is broader at high KER than for \mbox{$Δq =1$}. The difference generally diminishes with increasing projectile charge. Two deviations in this general trend are seen in the fragmentation of CO$_2^{3+}$, one for Ar$^{4+}$ impact in the high KER region and the other for Ar$^{6+}$ impact in the low KER region. The calculated reaction windows for multielectron capture within the framework of the extended classical over-the-barrier model (ECOBM) indicate that while ionization of the target occurs via multielectron capture, the scattered projectile may subsequently undergo multi-fold autoionization. Interpreting projectile autoionization to be a consequence of capture into highly excited states and high fragment KER to be a consequence of excitation of the ionized target to high-lying states, we find a strong dependence between the target and scattered projectile excitations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_09348 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Association between projectile and target excitation in slow Ar$^{q+}$-CO$_2$ collisions Srivastav, Akash Srivastav, Sumit P, Vishnu Bapat, Bhas Atomic Physics We investigate ionic fragmentation of CO$_2^{n+}$~\mbox{($2\le n\le 4$)} produced in collisions with Ar$^{q+}$~\mbox{($4\le q\le 16$)} projectiles at a collision velocity of $\approx$~0.3~a.u. For most projectile and fragmentation channel combinations, the shape of the kinetic energy release distribution (KERD) differs with the electron capture mediated charge change (\mbox{$Δq$}) in the scattered projectile: KERD for \mbox{$Δq = 2$} is broader at high KER than for \mbox{$Δq =1$}. The difference generally diminishes with increasing projectile charge. Two deviations in this general trend are seen in the fragmentation of CO$_2^{3+}$, one for Ar$^{4+}$ impact in the high KER region and the other for Ar$^{6+}$ impact in the low KER region. The calculated reaction windows for multielectron capture within the framework of the extended classical over-the-barrier model (ECOBM) indicate that while ionization of the target occurs via multielectron capture, the scattered projectile may subsequently undergo multi-fold autoionization. Interpreting projectile autoionization to be a consequence of capture into highly excited states and high fragment KER to be a consequence of excitation of the ionized target to high-lying states, we find a strong dependence between the target and scattered projectile excitations. |
| title | Association between projectile and target excitation in slow Ar$^{q+}$-CO$_2$ collisions |
| topic | Atomic Physics |
| url | https://arxiv.org/abs/2604.09348 |