First detection of the O-18 isotope of methanol

Details First detection of the O-18 isotope of methanol First detection of the O-18 isotope of methanol

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.240p..35g&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 240, Sept. 15, 1989, p. 35P-40P.

Astronomy and Astrophysics

Astronomy

6

Abundance, Interstellar Chemistry, Methyl Alcohol, Oxygen 18, Carbon Monoxide, Formaldehyde, Molecular Collisions

Scientific paper

Interstellar CH3(O-18)H has been detected using NASA's 70-m antenna at Tidbinbilla. The 2(0)-3(-1) transition at 11.6 GHz was detected in absorption at two positions in the direction of Sgr B2. The profile shapes were similar to those for the corresponding transitions of CH3OH and (C-13)H3OH, containing velocity components centered near 64 and 80 km/s. Abundance ratios were derived using the simplest assumptions. The O-16/O-18 ratio was 210 + or - 40; the value would be larger after correction for radiation trapping but still well below the terrestrial value of 489. The (C-13)H3OH/CH3(O-18)H ratio was 7.5 + or - 1.0, above the value (5.5) derived from terrestrial C-12/C-12 and O-16/O-18 ratios, but close to the isotope abundance ratio (9.0) determined from formaldehyde observations. In view of the complexity of the methanol energy-level diagram, the similarity suggests that excitation of the lowest energy levels is largely collisional.

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