Fine-structure transitions of Si and S induced by collisions with atomic hydrogen
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arXiv
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866909418586636288 |
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| author | Yan, Pei-Gen Babb, James F. |
| author_facet | Yan, Pei-Gen Babb, James F. |
| contents | Using a quantum-mechanical close-coupling method, we calculate cross sections for fine structure excitation and relaxation of Si and S atoms in collisions with atomic hydrogen. Rate coefficients are calculated over a range of temperatures for astrophysical applications. We determine the temperature-dependent critical densities for the relaxation of Si and S in collisions with H and compare these to the critical densities for collisions with electrons. The present calculation should be useful in modeling environments exhibiting the [S i] 25 μm and [S i] 57 μm far-infrared emission lines or where cooling of S and Si by collisions with H are of interest. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2304_02727 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Fine-structure transitions of Si and S induced by collisions with atomic hydrogen Yan, Pei-Gen Babb, James F. Atomic Physics Cosmology and Nongalactic Astrophysics Using a quantum-mechanical close-coupling method, we calculate cross sections for fine structure excitation and relaxation of Si and S atoms in collisions with atomic hydrogen. Rate coefficients are calculated over a range of temperatures for astrophysical applications. We determine the temperature-dependent critical densities for the relaxation of Si and S in collisions with H and compare these to the critical densities for collisions with electrons. The present calculation should be useful in modeling environments exhibiting the [S i] 25 μm and [S i] 57 μm far-infrared emission lines or where cooling of S and Si by collisions with H are of interest. |
| title | Fine-structure transitions of Si and S induced by collisions with atomic hydrogen |
| topic | Atomic Physics Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2304.02727 |