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Table 4:

Fractional abundances and abundance ratios from the standard gas-phase modela.

T = 10 K 		HNCO/H2 HOCN/H2 HCNO/H2 HONC/H2 HNCO/HOCN HNCO/HCNO HCNO/HOCN
  $\times10^{13}$ $\times10^{13}$ $\times10^{13}$ $\times10^{13}$      

n(H2) cm-3 		             
$1 \times 10^3$ 3.3 0.67 5.1 1.5 5.0 0.6 7.7
  4.7 1.0 7.1 2.0 4.7 0.7 7.1
$3 \times 10^3$ 9000 720 2000 380 13 4.6 2.7
  20 000 1400 4900 1100 14 4.1 3.5
$1 \times 10^4$ 19 000 1300 2100 170 14 8.9 1.6
  47 000 2300 4500 400 20 11 1.9
$3 \times 10^4$ 18 000 1200 1300 41 15 13 1.1
  55 000 1900 2500 90 30 22 1. 3
$1 \times 10^5$ 9200 670 680 6.8 14 14 1.0
  41 000 980 1000 11 42 39 1.1
$3 \times 10^5$ 3400 300 380 1.3 11 9.0 1.3
  20 000 420 440 1.5 47 45 1.1
$5 \times 10^5$ 2000 190 290 0.6 10 6.7 1.5
  13 000 290 340 0.8 45 38 1.2
106 900 100 200 0.2 8.7 4.5 1.9
  7100 160 180 0.2 46 39 1.2
T = 50 K HNCO/H2 HOCN/H2 HCNO/H2 HONC/H2 HNCO/HOCN HNCO/HCNO HCNO/HOCN
  $\times10^{13}$ $\times10^{13}$ $\times10^{13}$ $\times10^{13}$      

n(H2) cm-3 		             
$1 \times 10^3$ 16 000 240 5200 2100 66 3.1 22
  24 000 330 8500 4000 74 2.8 26
$1 \times 10^4$ 32 000 650 2400 220 49 13 3.8
  110 000 1700 3300 240 63 33 1.9
$1 \times 10^5$ 9600 240 380 4.1 40 25 1.6
  49 000 670 180 1.4 73 280 0.3
$1\times 10^6$ 1000 17 36 0.04 59 28 2.1
  6700 22 7.0 0.005 300 960 0.3

Notes. For each density and temperature, the first line refers to steady state whereas the second line refers to early time. Early-time results computed at maximum of HNCO abundance. (a) With the rate coefficients for CH2 + NO measured by Fikri et al. (2001), in which HCNO is the major product.


Source LaTeX | All tables | In the text

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