Depletion and fractionation of nitrogen in collapsing cores

Open Access

Table B.2

Direct cosmic-ray desorption reactions.


Reaction					α ⁽¹⁾	E_ads
CH4*	+CRP	→	CH4	GRAIN	7.000e+01	1.120e+03
O2*	+CRP	→	O2	GRAIN	7.000e+01	1.210e+03
H2O*	+CRP	→	H2O	GRAIN	8.000E–01	8.550e+02
CO*	+CRP	→	CO	GRAIN	7.000e+01	8.550e+02
CO2*	+CRP	→	CO2	GRAIN	7.000e+01	2.690e+03
N*	+CRP	→	N	GRAIN	7.000e+01	8.000e+02
NH3*	+CRP	→	NH3	GRAIN	2.360e+00	8.550e+02
N2*	+CRP	→	N2	GRAIN	7.000e+01	7.900e+02
CH3OH*	+CRP	→	CH3OH	GRAIN	7.000e+01	4.240e+03
H2CO*	+CRP	→	H2CO	GRAIN	7.000e+01	1.760e+03
HCO2H*	+CRP	→	HCO2H	GRAIN	7.000e+01	1.500e+03
OCS*	+CRP	→	OCS	GRAIN	7.000e+01	3.000e+03
H2S*	+CRP	→	H2S	GRAIN	7.000e+01	1.800e+03
Fe*	+CRP	→	Fe	GRAIN	7.000e+01	2.400e+03
HDO*	+CRP	→	HDO	GRAIN	8.000E–01	8.550e+02
D2O*	+CRP	→	D2O	GRAIN	8.000E–01	8.550e+02
NH2D*	+CRP	→	NH2D	GRAIN	2.360e+00	8.550e+02
NHD2*	+CRP	→	NHD2	GRAIN	2.360e+00	8.550e+02
ND3*	+CRP	→	ND3	GRAIN	2.360e+00	8.550e+02

Notes. The ¹⁵N substitutions, which are identical to the ¹⁴N reactions, are not shown here. CRP stands for cosmic-ray particle. Mantle species are denoted by an asterisk. ⁽¹⁾ The rate is computed as in Flower et al. (2005; see their Sect. 3.3) and Faure et al. (2019) (Eq. (7)), where the yield (noted γ in Flower et al. 2005) is given by , and the binding energy is E_ads. The binding energies of the ¹⁴N and ¹⁵N variants of adsorbed species have equal values. The same desorption reactions, but by secondary photons (photodesorption), are also taken into accountin UGAN.

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