and dense clouds with T=10-30K and density n=-. Ion-chemical routes in both dense and diffuse clouds have been established for some works (Hartquist 1990).

oHO production pathways

The oHO radical is linked with the production of H₂O in molecular clouds. Studies of oHO distribution in Taurus Molecular Cloud-1 (TMC-1) suggest that in dense gas, oHO is mainly formed by dissociative recombination of . Dissociative recombination is the reaction in which a molecular ion recombines with an electron and dissociates into

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