Molecular absorption lines toward star-forming regions: a comparative study of HCO+, HNC, HCN, and CN

B. Godard; E. Falgarone; M. Gerin; P. Hily-Blant; M. De Luca

doi:10.1051/0004-6361/201014283

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Volume 520 (September-October 2010)

A&A, 520 (2010) A20

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Table C.1:

Rates k of the main reactions of the cyanide chemistry.
Reaction				$\alpha$	$\beta$	$\gamma$	Ref.
CN	+ h $\nu$	$\rightarrow$ C	+ N	4.64 (-10)	0.00	3.6	a
HCN	+ h $\nu$	$\rightarrow$ CN	+ H	5.70 (-10)	0.00	2.6	a
HNC	+ h $\nu$	$\rightarrow$ CN	+ H	5.70 (-10)	0.00	2.6	a
HCNH⁺	+ e^-	$\rightarrow$ HCN	+ H	9.45 (-08)	-0.65	0.0	b,c
HCNH⁺	+ e^-	$\rightarrow$ HNC	+ H	9.45 (-08)	-0.65	0.0	b,c
HCNH⁺	+ e^-	$\rightarrow$ CN	+ 2H	9.10 (-08)	-0.65	0.0	b,c
HCNH⁺	+ e^-	$\rightarrow$ CN	+ H₂	1.80 (-08)	-0.65	0.0	b,c
H₂NC⁺	+ e^-	$\rightarrow$ HNC	+ H	1.75 (-07)	-0.50	0.0	d
H₂NC⁺	+ e^-	$\rightarrow$ CN	+ H₂	1.75 (-07)	-0.50	0.0	d
HNC⁺	+ e^-	$\rightarrow$ CN	+ H	3.90 (-07)	-1.00	0.0	e,f
HCN⁺	+ e^-	$\rightarrow$ CN	+ H	3.90 (-07)	-1.00	0.0	e
CH₃⁺	+ N	$\rightarrow$ HCN⁺	+ H₂	2.20 (-11)	0.00	0.0	g
CH₃⁺	+ N	$\rightarrow$ HCNH⁺	+ H	2.20 (-11)	0.00	0.0	g
CH₃⁺	+ N	$\rightarrow$ H₂NC⁺	+ H	2.20 (-11)	0.00	0.0	g
CH₂⁺	+ N	$\rightarrow$ HCN⁺	+ H	4.70 (-10)	0.00	0.0
CH₂⁺	+ N	$\rightarrow$ HNC⁺	+ H	4.70 (-10)	0.00	0.0
CH⁺	+ N	$\rightarrow$ CN⁺	+ H	1.90 (-10)	0.00	0.0	h
CH₂	+ N	$\rightarrow$ HCN	+ H	3.95 (-11)	0.17	0.0	i
CH	+ N	$\rightarrow$ CN	+ H	2.00 (-10)	0.00	0.0	j
C⁺	+ NH	$\rightarrow$ CN⁺	+ H	7.80 (-10)	0.00	0.0
C⁺	+ NH₂	$\rightarrow$ HCN⁺	+ H	1.10 (-09)	0.00	0.0
HCN⁺	+ H₂	$\rightarrow$ HCNH⁺	+ H	9.00 (-10)	0.00	0.0	k
HNC⁺	+ H₂	$\rightarrow$ HCNH⁺	+ H	9.00 (-10)	0.00	0.0	k

Notes. The photoreaction rates writte $k = \alpha \cdot {\rm exp}(-\gamma A_V)$ while all the other reaction rates are derived as $k = \alpha \cdot (T/{\rm 300~K})^{\beta} {\rm exp}(-\gamma / T)$ where T is the effective temperature (Zsargó & Federman 2003). Numbers in parenthesis are power of 10.

References. ^(a) Roberge et al. (1991); ^(b) Florescu-Mitchell & Mitchell (2006); ^(c) Semaniak et al. (2001); ^(d) Adams & Smith (1988); ^(e) Sheehan et al. (1999); ^(f) Talbi et al. (2000); ^(g) Fehsenfeld (1976); ^(h) Viggiano et al. (1980); ⁽ⁱ⁾ Smith et al. (2004); ^(j) Brownsword et al. (1996); ^(k) Huntress (1977).

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