Long-time atmospheric tritium record in Croatia (CROSBI ID 81069)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Horvatinčić, Nada ; Krajcar Bronić, Ines ; Obelić, Bogomil ; Bistrović, Romana
engleski
Long-time atmospheric tritium record in Croatia
The time evolution and temperature dependence of electron energy distribution functions (EDFs) are studied in pure rare gases (He, Ne, Ar, Kr, Xe) as well as in their mixtures by using solutions of the Boltzmann equation. A clear difference netween the gases having the Ramsauer-Townsend (RT) minimum in the momentum-transfer cross section (RT-gases: Ar, Kr, Xe), and those without the RT minimum (non-RT gases: He and Ne)is pointed out. The influence of the position and the depth of the RT minimum on the EDF and time evolution is studied for three different initial electron energies. A formula proposed for describing thermalization time in a mixture is tested on (i) a non-RT-non-RT gas mixture, (ii) a RT-non-RT mixtures and (iii) a RT-RT gas mixture. The linear combination of the reciprocal thermalization times in gas mixture with the component concentrations as weighting factors is found to be valid for gases with a similar energy dependence of the momentum-transfer cross section, and also for all rare-gas binary mixtures if the initial electron energy is sufficiently below the RT minimum. Conspicious deviations from the linear relationship are observed in mixtures of gases whose energy dependence of m-t cross section (or the stopping cross section) are different, and theoretical rationales for these findings are provided.
tritium in atmosphere; Croatia
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano
nije evidentirano