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Investigation of the NH2 radical produced by pulse radiolysis of ammonia in aqueous solution
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Formation of P-32-labeled Polyphosphates in Reactor-Irradiated Solution of Orthophosphate:The Role of OH-Radicals
No full textThe Dose Rate Dependence of the Yield of Trapped Electrons in Crystalline Ice:An Evaluation of the Reaction Rates of the Mobile Electrons
No full textThe yield of localized excess electrons in crystalline H2O ice has been studied as a function of the dose rate at various temperatures in the range −10 to −40°C. The G value was found to decrease significantly with increasing dose rate. Thus it appears that the localization of electrons takes place in competition with other reactions and we propose a simple model where we assume that the mobile electrons can undergo bimolecular bulk reactions with protons and OH radicals. Rate constants of 3.0 × 1015 M−1 S−1 and 1.4 × 1014 M−1 S−1 for the two reactions were required in the model in order to account for the experimental dose rate dependence observed at −10° C. The reaction with the protons has a negative temperature coefficient while the reaction with the OH radicals has an activation energy of about 14 kcal mole−1. The mobility of the proton was estimated to be about 3 × 10−4 cm2 V−1 S−1 at −10°C
Kinetics of Methyl Radicals Studied by Pulse Radiolysis Combined with Infrared Diode Laser Spectroscopy
No full textKinetics and branching ratios of the reactions NH<sub>2</sub>+NO<sub>2</sub>->N<sub>2</sub>O+H<sub>2</sub>O and NH<sub>2</sub>+NO<sub>2</sub>->H<sub>2</sub>NO+NO studied by pulse radiolysis combined with time-resolved infrared diode laser spectroscopy
No full textThe source reaction F + NH3 --> HF + NH2 was initiated by the pulse radiolysis of NH3/SF6 mixtures, and the primary yield of F atoms was determined by monitoring the decrease in the infrared absorption of methane consumed in the titration reaction F + CH4 --> HF + CH3. The title reactions have been studied by monitoring the decay of NH2 and the simultaneous formation of N2O and NO by time-resolved infrared diode laser spectroscopy. The decay rate of NH2 was studied as a function of NO2 concentration to obtain an overall rate constant k(NH2 + NO2) = (1.35 +/- 0.15) X 10(-11) molecule(-1) cm(3) s(-1) at 298 K and with a bath gas pressure of p(SF6) = 40 mbar. Two product channels have been identified, N2O + H2O and H2NO + NO, with relative yields of (59 +/- 3)% and (40 +/- 5)%, respectively
Danske forskningsprojekter inden for atmosfærekemi og -fysik. Rapport udarbejdet til Planlægningsrådet for Forskningen
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