Abstract
Dry ice (solid CO 2) occurs in the polar caps of Mars, on the surface of Triton, and in places in the outer planets of our solar system. Radicals in γ-irradiated solid CO 2 have been studied by ESR for future applications of ESR dating on outer planets. The annealing curves for CO − 3 radical (ESR signal at g = 2.0126) can be described neither by the first-order nor the second-order decay kinetics. The peak observed in the Arrhenius plot can result from two parallel first-order kinetic processes. Radicals that provide overlapping signals are CO − 3 ( g 1 = 2.0057, g 2 = 2.0126, g 3 = 2.0161; activation energy E = 0.10 eV; frequency factor ν 0=4×10 1 s −1) and HO 2 ( g 1 = 2.0040, g 2 = 2.0055, g 3 = 2.0360), which have E = 0.28 eV and ν 0=7×10 5 s −1). Hence, HO 2 is more thermally stable, and use of HO 2 is promising for ESR dating.
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