OBSERVATIONS OF THE THERMAL BEHAVIOR OF RADICALS IN GAMMA-IRRADIATED ICE
Ice was subjected to gamma radiation at 77 deg K and the EPR spectra of the radicals produced were examined as a function of temperature. The spectrum consisted of a doublet centered at g = 2.008 plus or minus 0.002 and split by 40 gauss; the corresponding spectrum of irradiated D/sub 2/O consisted of a triplet with approximately 6 gauss between adjacent lines. The doublet decayed rapidly above 100 deg K leaving a residual broad line which was thermally stable until approximately 145 deg K The main spectrum is attributed to the OH radical and the residual line assigned to the HO/sub 2/ radical. The decay process of the OH radicals was shown to follow the rate law d(OM/dt = --k(OH)/sup 3/2/ where k = 8.5 x 10/sup 12/ exp--6000/RT (liter/mole)/sup 1/2/ sec/sup -1/. The magnitude of the rate constant was shown to be a function of the total irradiation damage experienced by the ice sample. Stabilization of OH radicals at 77 deg K was studied as a function of total irradiation dosage; saturation is reached at an OH concentration of 1.8 x 10/sup -3/M or 0.003 mole %. The EPR spectrum of a frozen aqueous NO solution was also observed; it consisted of a broad line centered at approximately g = 2.08. (auth)
- Research Organization:
- Aerojet-General Corp., Azusa, Calif.
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-14-013759
- OSTI ID:
- 4142360
- Journal Information:
- J. Chem Phys., Journal Name: J. Chem Phys. Vol. Vol: 32
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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