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Table 2

Photodissociation rates from the quiet-Sun reference spectrum at 1 AU for the observed molecules and corresponding scale-lengths in C/2001 Q4 and C/2002 T7 at rh = 0.97 and 0.72 AU, respectively.

Molecule β0a La β0,pb Lpb
(s-1) (km) (s-1) (km)
C/2001 Q4 C/2002 T7 C/2001 Q4 C/2002 T7

CO 6.5 × 10-07 1100100 717800
CH3OH 1.3 × 10-05 55000 35900
CS 2.5 × 10-05 28600 18700 1.7 × 10-03 400 300
H2CO 2.0 × 10-04 3600 2300 1.0 × 10-04 7200 4700
HCN 1.5 × 10-05 47700 31100
HNC 1.9 × 10-05 36700 23900

Notes.

(a)

Photodissociation rates and scale-lengths for release from the nucleus surface.

(b)

Photodissociation rates and scale-lengths from a parent distributed source.

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