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Table 20

Cosmic ray photodestruction rates (× 10-16 s-1).

Species Diss.a Ion.a Species Diss. Ion. Species Diss. Ion.
H – – C2 180 250 NO2 1000 110
Li – 250 C2H 1100 – N2O 1400 99
C – 260 C2H2 3500 380 CN 450 8.3
N – – C2H4 3500 280 HCN 2000 14
O – 2.7 C2H6 2100 180 HC3N 5900 160
Na – 13 C3 6900 89 CH3OH 1600 240
Mg – 110 l-C3H 3000 – CH3CN 2600 97
Al – 2500 c-C3H 480 – CH3SH 2700 2000
Si – 4200 HC3H 1100 – CH3CHO 2200 690
P – 1500 l-C3H2 3400 – CH3NH2 450 1800
S – 800 c-C3H2 690 – NH2CHO 2900 410
Cl – 47 l- C4 1800 – C2H5OH 2600 380
K – 34 l-C4H 6100 – C3H7OH 4600 590
Ca – 270 l- C5H 170 – SH 1100 34
Ti – 230 OH 470 – SH+ 460 –
Cr – 1200 OH+ 8.6 – H2S 3400 620
Mn – 49 H2O 1000 23 CS 1900 20
Fe – 480 O2 780 28 CS2 5500 310
Co – 60 O 70 – OCS 5200 560
Ni – 140 HO2 190 – S2 88 140
Zn – 180 H2O2 830 180 SO 5500 450
Rb – 23 O3 1500 32 SO2 2700 110
Ca+ – 1.5 CO 46b 14 SiH 620 –
H− – 1300 CO+ 77 – SiH+ 1200 –
H2 – – CO2 600 8.2 SiO 890 –
H2+ 610 – HCO 530 – HCl 1500 46
H3+ – – HCO+ 3.3 – HCl+ 97 –
CH 1100 580 H2CO 1300 290 NaCl 180 –
CH+ 220 – NH 370 7.1 PH 720 –
CH2 290 – NH+ 22 – PH+ 90 –
CH 89 – NH2 720 140 AlH 54 150
CH3 280 380 NH3 1100 220 LiH 620 –
CH4 1500 22 N2 39c – MgH 250 –
CH 270 – NO 300 240 NaH 930 –

Notes.

(a)

Assumes a cosmic ray ionisation rate of ζH2 = 10-16 s-1 H2-1. A simple scaling recovers photodestruction rates for other values of ζH2.

(b)

Assumes an abundance relative to H-nuclei of xCO = 10-5 and significant self-shielding. Rate neglecting self-shielding: 9.9×10 s-1.

(c)

Assumes an abundance relative to H-nuclei of xN2 = 10-5 and significant self-shielding. Rate neglecting self-shielding: 1.2×10 s-1.

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