NASA NTRS · 19730045934
On the interstellar CO/+//CO abundance ratio.
Abstract
A search at high sensitivity for interstellar absorption in the 4250-A line of CO(+) yields negative results toward 14 stars, despite the pervasive presence of large amounts of CO in the interstellar gas. This result is in accord with theory, but still lacks by a large factor sufficient sensitivity to test any details of the theory.
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Hobbs, L. M.. 1973-05-01. On the interstellar CO/+//CO abundance ratio.. https://ntrs.nasa.gov/citations/19730045934
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