A survey of volatile species in Oort cloud comets C/2001 Q4 (NEAT) and C/2002 T7 (LINEAR) at millimeter wavelengths

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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 r_h = 0.97 and 0.72 AU, respectively.

Molecule	β₀^a	L^a		β_0,p^b	L_p^b
	(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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