Some diatomic molecules from comet P/Halley’s UV spectra near spacecraft flybys
The abundances of diatomic molecules seen in the UV both give clues to the parent compounds and help unravel the gas and ion mass spectrometry. From IUE spectra of comet Halley, we find upper limits on SH and CS+ column densities, and estimates of probable NO, S2, and SO. In particular, judged from the 226 nm γ-band, NO was relatively abundant at 2–8 1013 cm−2 on March 9–14. The production rate of S2 was around 1 1027 molecules s −1 at that time, but both showed day-to-day variability by 2–3 times.
Key wordsgas coma coma molecules UV spectroscopy
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