Naslov
Long-time atmospheric tritium record in Croatia

Autori
Horvatinčić, Nada ; Krajcar Bronić, Ines ; Obelić, Bogomil ; Bistrović, Romana

Izvornik
Acta geologica Hungarica (0236-5278) 39 (1996); 81-84

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
tritium in atmosphere

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA