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Table 2:

Predicted steady-state fractional abundances of several nitrogen-bearing species in three different models.

Species 		I II III Observations
N2H+a 100:0 90:10 90:10  
NH4+b 85:2:13 85:2:13 95:2:3  
N2 1.0( -5) 1.0( -5) 1.0( -5) -
N 2.4( -7) 2.5( -7) 2.9( -7) -
NH 3.5(-11) 9.5(-11) 8.8(-11) $2.0\pm1.0(-9)$
NH2 1.9(-10) 1.9(-10) 1.3(-10) $4.0\pm2.0(-10)$
NH3 3.7( -8) 3.7( -8) 8.3( -8) $\rm0.3^{+0.1}_{-0.1}-2^{+0.8}_{-0.8}(-8)$
NH:NH2:NH3 0.2:1:190 0.5:1:190 0.7:1:640 5:1:300

Notes. Numbers in parenthesis are powers of ten. Branching ratios (BR) for the dissociative recombination (DR) of NH2+ are N + H2 (4%), NH + H (39%) and N + 2H (57%) (Thomas et al. 2005). (a) BR for the DR of N2H+ into N2 + H and NH + N, respectively (Molek et al. 2007; Adams et al. 2009). (b) BR for the DR of NH4+ into NH3 + H, NH2 + H2, and NH2 + 2H, respectively (Öjekull et al. 2004). See additional details in Table B.1.


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