Table 2: Reaction rate coefficients for reaction R₁ and R₂ estimated by Boice et al. (1986).
T[K] k(R₁) [cm³/s] k(R₂) [cm³/s]

10 000 $1.37 \times 10^{-11}$ $9.32 \times 10^{-12}$

15 000 $1.15 \times 10^{-10}$ $2.13 \times 10^{-10}$

20 000 $3.35 \times 10^{-10}$ $1.01 \times 10^{-9}$

25 000 $6.32 \times 10^{-10}$ $2.57 \times 10^{-9}$

30 000 $9.55 \times 10^{-10}$ $4.77 \times 10^{-9}$

**Table 2:** Reaction rate coefficients for reaction R₁ and R₂ estimated by Boice et al. (1986).
T[K]	k(R₁) [cm³/s]	k(R₂) [cm³/s]
10 000	$1.37 \times 10^{-11}$	$9.32 \times 10^{-12}$
15 000	$1.15 \times 10^{-10}$	$2.13 \times 10^{-10}$
20 000	$3.35 \times 10^{-10}$	$1.01 \times 10^{-9}$
25 000	$6.32 \times 10^{-10}$	$2.57 \times 10^{-9}$
30 000	$9.55 \times 10^{-10}$	$4.77 \times 10^{-9}$

Article Contents

	1 Introduction
	2 The coma chemistry model
	3 Coma profiles used for the analysis
	4 The chemistry of possible C₂ and C₃ parents
	5 The main chemical reaction network for the formation of C₂ and C₃
	6 Model input: the nucleus - properties and composition
	7 Deriving the production rates
	8 Production rates for C₂H₂, C₂H₆ and C₃H₄
	9 Error discussion
	10 Abundance ratios relative to water and carbon monoxide
	11 Abundance ratios relative to acetylene
	12 Clues on the formation region of comet Hale-Bopp
	13 Summary
	References
	Online Material

	List of tables
	List of figures