Gastric stromal tumor stained with CD34 and infected with

Tokunaga, Yukihiko; Hata, Koichiro; Nishitai, Ryota; Kaganoi, Junichi; Ohsumi, Kiyosi; Tanka, Tomoyuki

doi:10.1067/msy.1998.87442

Cited by 1 publication

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This spectrum was chosen because the data are of high quality and the band strengths and profiles are representative of the sort of spectrum which is most commonly seen, i.e. the "Type A" spectrum (Geballe 1997;Tokunaga 1997;Peeters et al 2002;van Diedenhoven et al 2004).…”

Section: H + 6 Spectra Vs Astronomical Datamentioning

confidence: 99%

Interstellar Solid Hydrogen

Lin¹,

Gilbert²,

Walker³

2011

ApJ

View full text Add to dashboard Cite

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 H + 6 . This ion is not produced by gas-phase reactions and its radiative transitions therefore provide a signature of solid H 2 in the astrophysical context. The vibrational transitions of H + 6 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 H + 6 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.

show abstract

Section: H + 6 Spectra Vs Astronomical Datamentioning

confidence: 99%