Photodissociation branching of NH3
We have estimated the wavelength dependent branching ratio of NH3 into its main astrochemically-significant photodissociation products, NH2 and NH. A discussion of these cross sections is given in Heays et al. 2017, and principal sources of data are Slanger & Black 1982 and Leach et al. 2005.
We have calculated the partial photodissociation rates generating these products when exposed to various kinds of interstellar and cosmic-ray-generated radiation fields.
|NH3 ⟶ NH2 + H||NH3 ⟶ NH + 2H/H2|
2 In units of s-1.
3 Estimated branching fraction between all channels producing OH and O (or NH2 and NH) regardless of excitation state or the chemical co-fragment.
4 Estimated rate uncertainties: accurate to within 30% (A), a factor of 2 (B), a factor of 10 (C).