Analysis of the Influence of Laser Surface Irradiation Regimes in the Diagnostics of Hydrogen Isotope Retention

The paper compares the laser-assisted quadrupole mass spectrometry for two laser pulses (15 ns and 80 ps) for W-D films and Ti–V alloy with deuterium. A technique for the production of samples with high concentrations of trapped deuterium, which makes it possible to obtain a good signal repeatability on a quadrupole mass spectrometer for several laser shots, is presented, which can be used to align a diagnostic laser system. The experimental dependence of the total deuterium yield from the studied materials on the energy density is obtained. The high sensitivity of the technique, as well as a weak dependence on the laser pulse duration, is demonstrated. A significant change in the deuterium concentration in the near-surface layer of the tungsten film during contact with the atmosphere is noted.