HYDROGEN INVENTORY IN GALLIUM

Investigations of hydrogen inventory in gallium (99.9%) were carried o ut after saturation both from molecular phase and from glow discharge plasma at room temperature, 370 and 520 K. Saturation took place durin g 3000 s under hydrogen pressure of 20 Pa, and ion flux was about 1 x 10(15) ions/cm(2) s with an energy about 400 eV during discharge. Hydr ogen concentration in Ga at room temperature and that for 370 K by the saturation from gaseous phase was (2-3)x 10(14) cm(-3) Pa--1/2. Hydro gen concentration at temperature 520 K increased by five times. Invent ory at room temperature for irradiation from discharge was 7 x 10(16) cm(-3) at the dose about 3 x 10(18) ions/cm(2). It was more than inven tory at temperature 520 K by four times and more than maximum inventor y from gaseous phase at 520 K by a factor of 10. Inventory increased w hen temperature decreased. Diffusion coefficient D = 0.003 exp(- 2300/ RT) cm(2)/s, was estimated from temperature dependence.