Formaldehyde reactions in dark clouds

Details Formaldehyde reactions in dark clouds Formaldehyde reactions in dark clouds

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...391..141s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 391, no. 1, May 20, 1992, p. 141-143.

Astronomy and Astrophysics

Astrophysics

5

Dark Matter, Formaldehyde, Interstellar Chemistry, Molecular Clouds, Abundance, Deuterium Compounds, Helium Ions, Ion Cyclotron Radiation, Stellar Envelopes

Scientific paper

The low-pressure reactions of formaldehyde (H2CO) with D(+), D2(+), D3(+), and He(+) are studied by the ion-cyclotron resonance technique. These reactions are potential loss processes for formaldehyde in cores of dark interstellar clouds. The deuterated reactants represent direct analogs for protons. Rate coefficients and branching ratios of product channels have been measured. Charge transfer is observed to be the dominant reaction of H2CO with D(+), D2(+), and He(+) ions. Only the D3(+) reaction exhibits a proton-transfer channel. All reactions proceed at rate coefficients near the collision limit. Proton-deuteron exchange reactions are found to be inefficient processes in the formaldehyde system.

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