2023, Krat, S. A., Popkov, A. S., Vasina, Y. A., Gasparyan, Y. M., Pisarev, A. A., Крат, Степан Андреевич, Гаспарян, Юрий Микаэлович, Писарев, Александр Александрович

2020, Krat, S. A., Popkov, A. S., Gasparyan, Y. M., Vasina, Y. A., Prishvitsyn, A. S., Pisarev, A. A., Крат, Степан Андреевич, Гаспарян, Юрий Микаэлович, Пришвицын, Александр Сергеевич, Писарев, Александр Александрович

© 2020 IOP Publishing Ltd and Sissa Medialab.A setup for investigation of thermal desorption spectra of gases accumulated in thin films deposited by plasma sputtering of solid targets is described. Deposition and thermal desorption spectroscopy (TDS) are performed in two different vacuum chambers separated by a gate valve with the sample transferred between the chambers in-vacuo. The temperature of the substrate for deposited films can be varied in the range of 300-800 K; and the deposition rate is controlled by a quartz microbalance. Thermal desorption of co-deposited gases is analyzed by a quadrupole mass spectrometer. Sputtering rate and evaporation of the film during TDS are measured by quartz microbalances. Three experiments are described 1) trapping of deuterium by the growing chemically active Li film with subsequent decomposition and evaporation of the film, 2) temperature dependent deuterium trapping in the growing W film resulting in trapping with several binding energies, and 3) chemical interaction of D-Li layer with water vapor leading to isotopic H-D exchange and chemical transformation of the deposited film.

2020, Krat, S. A., Prishvitsyn, A. S., Vasina, Y. A., Gasparyan, Y. M., Pisarev, A. A., Крат, Степан Андреевич, Пришвицын, Александр Сергеевич, Гаспарян, Юрий Микаэлович, Писарев, Александр Александрович

© 2020 The Author(s)An improved diffusion based model for prediction of the hydrogen content in co-deposited layers depending on the deposition conditions (the properties of the material which is co-deposited with hydrogen, rate of deposition, hydrogen flux and particle energy, substrate temperature) is presented. The model is validated using experimental data for W, Mo and Al, and is compared to empirical scaling equations currently in use. It is shown that a good agreement is observed in regards to hydrogen content vs substrate temperature experimental data, and no disagreement with scaling equations can be seen in regards to the role of hydrogen flux and the rate of deposition. It is shown that the influence of hydrogen particle energy on the hydrogen content requires further investigation. In addition to hydrogen, models for other mobile impurities both in co-deposited layers and in layers under steady-state net erosion conditions are given.