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- W3104845068 endingPage "91" @default.
- W3104845068 startingPage "91" @default.
- W3104845068 abstract "We consider the possibility that solid molecular hydrogen is present in interstellar space. If so cosmic-rays and energetic photons cause ionisation in the solid leading to the formation of H6+. This ion is not produced by gas-phase reactions and its radiative transitions therefore provide a signature of solid H2 in the astrophysical context. The vibrational transitions of H6+ are yet to be observed in the laboratory, but we have characterised them in a quantum-theoretical treatment of the molecule; our calculations include anharmonic corrections, which are large. Here we report on those calculations and compare our results with astronomical data. In addition to the H6+ isotopomer, we focus on the deuterated species (HD)3+ which is expected to dominate at low ionisation rates as a result of isotopic condensation reactions. We can reliably predict the frequencies of the fundamental bands for five modes of vibration. For (HD)3+ all of these are found to lie close to some of the strongest of the pervasive mid-infrared astronomical emission bands, making it difficult to exclude hydrogen precipitates on observational grounds. By the same token these results suggest that (HD)3+ could be the carrier of the observed bands. We consider this possibility within the broader picture of ISM photo-processes and we conclude that solid hydrogen may indeed be abundant in astrophysical environments." @default.
- W3104845068 created "2020-11-23" @default.
- W3104845068 creator A5031268839 @default.
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- W3104845068 date "2011-07-12" @default.
- W3104845068 modified "2023-10-10" @default.
- W3104845068 title "INTERSTELLAR SOLID HYDROGEN" @default.
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- W3104845068 doi "https://doi.org/10.1088/0004-637x/736/2/91" @default.
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