Sticking probabilities of simultaneously adsorbed deuterium and nitrogen on thin iron film at 78 K

A flow technique has been applied to measure the partial sticking probabilities of deuterium and nitrogen, simultaneously interacting with thin iron films at 78 K. The features of sticking probability dependence on the quantity of nitrogen and deuterium consumed have been analysed for both simultaneous and post-dosing D2and N2adsorption and then have been compared with the corresponding dependencies measured for D2 and N2 separately adsorbed on clean iron film. It was found that simultaneously dosed N2and D2adsorb on Fe film with high sticking probabilities F1.at low coverage. A part of co-adsorbed nitrogen admolecules is removed from the Fe surface due to competitive adsorption of deuterium at higher coverage. The population of nitrogen simultaneously adsorbed with deuterium on the Fe film surface is similar to that found for the D2 adsorption on Fe film pre-covered with strongly adsorbed nitrogen admolecules and much higher than the population obtained after the post-dosing N2 adsorption on Fe film pre-covered with deuterium adspecies. q1999 Elsevier Science B.V. All rights reserved