Isotope exchange in Li-D co-deposited layers at temperatures below 200 °C

Abstract Hydrogen-deuterium isotope exchange in Li-D co-deposited films was studied as a method of removal of heavy hydrogen isotopes from Li films deposited in fusion devices. The total H and D retention was measured using in-vacuo thermal desorption spectroscopy. Co-deposited Li-D films were kept in H2 gas at 1 Pa and 105 Pa at room temperature, 100 °C, and 200 °C. Some reduction of the D content was observed even at RT, while nearly full isotope substitution was achieved at 200 °C after 1 day at 105 Pa in H2 gas.