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Forbidden Rotational Transitions in Interstellar H3+

Explore the forbidden rotational transitions in H3+ in metastable levels, presenting rigorous selection rules and rate equations. This study delves into collision reactions and production mechanisms in interstellar ammonia. Published at the 58th International Symposium on Molecular Spectroscopy.

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Forbidden Rotational Transitions in Interstellar H3+

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  1. Interstellar H3+ in Metastable Rotational LevelsTakeshi Oka and Erik EppDepartment of Chemistry and Department of Astronomy and Astrophysics, The Enrico Fermi Institute, The University of Chicagothe 58th International Symposium on Molecular SpectroscopyColumbus Ohio, FA06,10:27, June 20, 2003

  2. Δk = 3 Forbidden Rotational Transitions in H3+ μ Interstellar NH3 Oka, Shimizu, Shimizu, Watson, ApJ 165, L15 (1971) General Theory Watson, J. Mol. Spectrosc. 40, 536 (1971) H3+ Pan, Oka, ApJ 305, 518 (1986) Ab initio H3+ Neale, Miller, Tennyson, ApJ 335, 486 (1988)

  3. Δk = 3 Forbidden Rotational Transitions in H3+ Metastable 3.8 hours μ 15.8 hours 7.9 hours 20.4 days 27.2 days Interstellar NH3 Oka, Shimizu, Shimizu, Watson, ApJ 165, L15 (1971) Theory Watson, J. Mol. Spectrosc. 40, 536 (1971) H3+ Pan, Oka, ApJ 305, 518 (1986) Theory H3+ Neale, Miller, Tennyson, ApJ 335, 486 (1988)

  4. 11.4 years Quasi-metastable

  5. 4000 cm-1 2000 cm-1 0

  6. Radiation Collision Reaction C A A A B B D B Rigorous Selection Rules Approximate Random ortho  para ΔI = 0ortho  para ΔI = 0 ΔItotal = 0 +  - ΔJ = ± 1, 0

  7. Rate Equations 10-17 s-1 Production Spontaneous emission 4  10-7 s-1 Collision n(H2) 100 cm-3 10-7 s-1 Destruction 10-9 s-1 10-7 cm3 s-1 10-9 cm3 s-1 Detailed balance H3+ + H2 (H5+)*  H3+ + H2

  8. Para-H3+ Para-H3+ Ortho-H3+ Para-H3+

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