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Table B.1

Photoisomerization rates for the irradiation conditions in the Orion Bar.

Cloud depth Nph (23002800 Å) ξ tc ξ ct trans/cis-HCOOH Time
AV [mag] [photons cm-2 s-1] [s-1] [s-1] ratio at equilibrium [yr]

0 1.96 × 1012 5.45 × 10-11 1.27 × 10-10 2.3 1.7 × 102
1 1.80 × 1011 3.41 × 10-12 9.89 × 10-12 2.9 2.4 × 103
2 2.84 × 1010 3.79 × 10-13 1.31 × 10-12 3.5 1.9 × 104
3 4.93 × 109 4.62 × 10-14 1.87 × 10-13 4.1 1.3 × 105
5 1.69 × 108 7.83 × 10-16 4.29 × 10-15 5.5 6.2 × 106

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