Dissociative recombination of N$_2$H$^+$: Isotopic effects
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866912211160530944 |
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| author | Mezei, J. Zs. Orban, A. Demes, S. Ayouz, M. Faure, A. Hily-Blant, P. Schneider, Ioan F. |
| author_facet | Mezei, J. Zs. Orban, A. Demes, S. Ayouz, M. Faure, A. Hily-Blant, P. Schneider, Ioan F. |
| contents | The investigation of the isotopic ratio of interstellar nitrogen -- $^{14}$N versus $^{15}$N -- is done, for explaining its variations observed for N2H+ in different interstellar and Solar environments. The goal is to produce cross sections and rate coefficients for electron impact dissociative recombination for different isotopologues of N$_2$H$^+$, since it was envisioned as a novel source that can lead to nitrogen fractionation. We calculate dissociative recombination cross sections and rate coefficients using the normal mode approximation combined with the R-matrix theory and vibronic frame transformation within the multichannel quantum defect theory for eight isotopologues containing both $^{14}$N, $^{15}$N and H, D. Our calculations show that the relative differences respective to the main isotopologue ($^{14}$N$_2$H$^+$) is below 1% for the hydrogen containing isotopologues, but reaches almost 30% for the heaviest deuterated isotopologue, leading us to the conclusion that according to the present status of the theory, dissociative recombination is not responsible for the peculiar $^{14}$N/$^{15}$N isotopic ratios of N$_2$H$^+$ observed in the different interstellar molecular clouds. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2501_18434 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Dissociative recombination of N$_2$H$^+$: Isotopic effects Mezei, J. Zs. Orban, A. Demes, S. Ayouz, M. Faure, A. Hily-Blant, P. Schneider, Ioan F. Instrumentation and Methods for Astrophysics The investigation of the isotopic ratio of interstellar nitrogen -- $^{14}$N versus $^{15}$N -- is done, for explaining its variations observed for N2H+ in different interstellar and Solar environments. The goal is to produce cross sections and rate coefficients for electron impact dissociative recombination for different isotopologues of N$_2$H$^+$, since it was envisioned as a novel source that can lead to nitrogen fractionation. We calculate dissociative recombination cross sections and rate coefficients using the normal mode approximation combined with the R-matrix theory and vibronic frame transformation within the multichannel quantum defect theory for eight isotopologues containing both $^{14}$N, $^{15}$N and H, D. Our calculations show that the relative differences respective to the main isotopologue ($^{14}$N$_2$H$^+$) is below 1% for the hydrogen containing isotopologues, but reaches almost 30% for the heaviest deuterated isotopologue, leading us to the conclusion that according to the present status of the theory, dissociative recombination is not responsible for the peculiar $^{14}$N/$^{15}$N isotopic ratios of N$_2$H$^+$ observed in the different interstellar molecular clouds. |
| title | Dissociative recombination of N$_2$H$^+$: Isotopic effects |
| topic | Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2501.18434 |