Acetonitrile in the stratosphere-implications from laboratory studies

Details Acetonitrile in the stratosphere-implications from laboratory studies Acetonitrile in the stratosphere-implications from laboratory studies

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.290..321b&link_type=abstract

Nature, Volume 290, Issue 5804, pp. 321-322 (1981).

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Scientific paper

The presence of acetonitrile (CH3CN) in the stratosphere has been tentatively inferred1 from measurements of stratospheric positive ions around 36 km. As well as the expected proton hydrates H+(H2O)n' another ion family was observed to which was assigned the general form, H+Xl(H2O)m' where X is a molecule of mass 41 +/- 1 AMU. If these ions are formed from proton hydrates by reactions involving the unknown trace gas X, the latter must have a proton affinity of >= 175 kcal mol-1 and a number density of the order of 105 cm-3 around an altitude of 36 km. Two previously proposed identifications for X-NaOH and MgOH-have recently been excluded by new stratospheric ion composition data3,4 which unambiguously determined the mass of X to be 41 AMU and failed to show H+Xl(H2O)m ions containing the Mg isotopes 25 and 26. Another suggestion1 that X might be acetonitrile (CH3CN) has been criticized on the grounds that it is difficult to explain its presence in the stratosphere2. We now report laboratory studies of clustering equilibria for H+(CH3CN)l(H2O)m ions, which further support identification of X as acetonitrile.

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