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Table 2:

Rate coefficients for C2 in the Red Rectangle at a distance of 6'' to the central star.

Number
Spontaneous Ratea Number Pumping Ratea Number Intercombination Ratea
  emission k [s-1]   transition k [s-1]   transition k [s-1]

1
$A^1 \Pi_u$ $\rightarrow $ $X^1 \Sigma^+_g$ 5.1(4) 7 $X^1 \Sigma^+_g$ $\rightarrow $ $A^1 \Pi_u$ 4.0(-4) 13 a3 $\Pi _u$ $\rightarrow $ $X^1 \Sigma^+_g$ 3.8(-4)
2 $A^1 \Pi_u$ $\rightarrow $ $X^1 \Sigma^+_g (v^*)$ 2.0(4) 8 $X^1 \Sigma^+_g (v^*)$ $\rightarrow $ $A^1 \Pi_u$ 1.9(-4) 14 $a^3 \Pi_u (v^*)$ $\rightarrow $ $X^1 \Sigma^+_g (v^*)$ 1.3(-2)
3 $d^3\Pi _g$ $\rightarrow $ $a^3\Pi _u$ 7.0(6) 9 a3$\Pi _u$ $\rightarrow $ $d^3\Pi _g$ 1.7(-3) 15 $X^1 \Sigma^+_g (v^*)$ $\rightarrow $ a3$\Pi _u$ 7.0(-2)
4 $d^3\Pi _g$ $\rightarrow $ $a^3 \Pi_u (v^*)$ 2.3(6) 10 a3 $\Pi_u (v^*)$ $\rightarrow $ d3$ \Pi$g 7.1(-4) 16 $X^1 \Sigma^+_g (v^*)$ $\rightarrow $ $a^3 \Pi_u (v^*)$ 5.5(-3)
5 $d^3 \Pi_g (v^*)$ $\rightarrow $ a3$\Pi _u$ 2.8(6) 11 a3$\Pi _u$ $\rightarrow $ $d^3 \Pi_g (v^*)$ 5.4(-4) 17 $a^3 \Pi_u (v^*)$ $\rightarrow $ $X^1 \Sigma^+_g$ 1.0(-1)
6 $d^3 \Pi_g (v^*)$ $\rightarrow $ $a^3 \Pi_u (v^*)$ 7.8(6) 12 a3 $\Pi_u (v^*)$ $\rightarrow $ $d^3 \Pi_g (v^*)$ 1.3(-3)      

Notes. (a) Values in brackets give exponents to base 10.


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