Synchrotron radiation-stimulated desorption from Pd or Pd/TiZrV coated copper tubes

Gas desorption from copper tubes coated with Pd or Pd/TiZrV in response to synchrotron radiation was investigated. Following activation (250 °C for 4 h), Pd/TiZrV film exhibited H2 desorption yield that was over one order of magnitude lower than that from TiZrV film. The Pd and Pd/TiZrV films also desorbed smaller amount of CO and CO2 during exposure. Compared to the TiZrV film, the Pd film exhibited a higher H2 pumping rate and was more likely to release H2 and CO during activation. These characteristics are considered to have reduced the photon-stimulated desorption yield of the Pd layer. •Gas desorption from Pd or Pd/TiZrV coated tubes in response to SR were measured.•H2 desorption yield from Pd/TiZrV film was more than one order of magnitude lower than that from TiZrV film.•Pd surface released smaller amount of CO and CO2 than TiZrV surface during exposure.•It is confirmed that applying Pd films to surface effectively reduced desorption yield.