The migration of 1H and 2H on the (111) plane of a W field emitter was studied by using the fluctuation method. Both activated and unactivated diffusion was observed. As the latter revealed a very small isotope effect, it was suggested that mass renormalization caused the effective masses of 1H and 2H to be essentially identical. The diffusivity values in the temperature-independent regime ranged from 5 x 10-14 to 10-13cm2/s; depending upon the coverage (table 265).

C.Dharmadhikari, R.Gomer: Surface Science, 1984, 143[1], 223-42