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Home All issues Volume 523 (November-December 2010) A&A, 523 (2010) A77 Full HTML
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Table 4

Comparison between the formation and dissociation cross section of H2O2 from the processing of pure H2O ices and H2O:CO2 ices.

Ices Temp. Projectile σf σd Gf −Gd H2O2/H2O† Ref.
(K) (Energy) (10-13 cm2) (10-13 cm2) (molec/100 eV) (molec/100 eV) (%)
H2O 13 Ni13+ (52 MeV) 0.19 10 1.3 68.0 1.9 [1]
H2O:CO2 (10:1) 13 Ni13+ (52 MeV) 0.13 9.3 0.87 59.1 1.6 [1]
H2O:CO2 (1:1) 13 Ni13+ (52 MeV) 0.10 6.9 0.48 33.8 1.5 [1]
H2O 16 H+ (30 keV) ~0.001 0.06 0.45 271 0.21 [2]
H2O 16 C+ (30 keV) ~0.001 0.07 0.23 15.8 1.7 [2]
H2O 16 N+ (30 keV) ~0.001 0.09 0.19 17.1 1.6 [2]
H2O 16 O+ (30 keV) 0.002 0.13 0.34 22.3 1.4 [2]
H2O 16 Ar+ (30 keV) 0.002 0.07 1.34 46.8 2.2 [2]
H2O 20 H+ (100 keV) ~0.001 0.20 0.38 76.1 0.75 [3]
H2O 16 H+ (200 keV) ~0.001 0.09 0.49 43.9 1.2 [4]
H2O 16 He+ (200 keV) 0.003 0.13 0.37 16.1 2.4 [4]
H2O 16 Ar2+ (400 keV) ~0.001 0.04 0.07 2.79 6.0 [4]

Notes. The formation and dissociation radiochemical yields of H2O2, as well the asymptotic H2O2/H2O ratio in each experiment, are also given.

†

Asymptotic value;

[1] this study; [2] Gomis et al. (2004a); [3] Loeffler et al. (2006); [4] Gomis et al. (2004b).

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