Table 2: The UV destruction cross-sections ( $\sigma _{\rm uv}$ ) and half-lives in the experimental set-up in the laboratory and in the diffuse interstellar environment (DISM), dense clouds (DC) and the Solar System at 1 AU from the Sun (SoSy). Also included in this table is the cyclic hydrogen-bonded trimer of HCN, which is the first photoproduct of s-triazine. Upon continued irradiation, c-(HCN)₃ is also photolysed, see Fig. 4.
$\sigma _{\rm uv}$ Half-life

(cm² molecule^-1) lab (s) DISM (yr) DC (Myr) SoSy (min)

Pyridine $1.2\times10^{-17}$ 123 18 1.8 32

Pyrimidine $2.7\times10^{-17}$ 56 8.1 0.81 14

s-Triazine $8.7\times10^{-17}$ 17 2.5 0.25 4.4

c-(HCN)₃ $2.6\times10^{-17}$ 57 8.3 0.83 15

**Table 2:** The UV destruction cross-sections ( $\sigma _{\rm uv}$ ) and half-lives in the experimental set-up in the laboratory and in the diffuse interstellar environment (DISM), dense clouds (DC) and the Solar System at 1 AU from the Sun (SoSy). Also included in this table is the cyclic hydrogen-bonded trimer of HCN, which is the first photoproduct of s-triazine. Upon continued irradiation, c-(HCN)₃ is also photolysed, see Fig. 4.
	$\sigma _{\rm uv}$	Half-life
	(cm² molecule^-1)	lab (s)	DISM (yr)	DC (Myr)	SoSy (min)
Pyridine	$1.2\times10^{-17}$	123	18	1.8	32
Pyrimidine	$2.7\times10^{-17}$	56	8.1	0.81	14
s-Triazine	$8.7\times10^{-17}$	17	2.5	0.25	4.4
c-(HCN)₃	$2.6\times10^{-17}$	57	8.3	0.83	15

Source LaTeX | All tables | In the text

	1 Introduction
	2 Experimental
	3 Results
	4 Discussion
	5 Conclusion
	References