Fig. 7: In situ SPEM: scanning photoelectron microscopy.
From: In situ observation of oscillatory redox dynamics of copper
a Maps recorded under 4% O2 and 96% H2 at 650 °C and 20 Pa. The intensity of the photoemission signal within an energy window of 2 eV centred at 932.7 eV was used to generate the maps. b Cu surface morphology was frozen by pumping to high vacuum conditions at 650 °C. Three representative points have been chosen to investigate the state of copper: Point A is located at a reduction front, B is located in an area between oxide islands, C on the rim of an oxide island); c in situ SEM image for comparison of surface features. d Cu LMM spectra corresponding to point A showed a mixture of Cu and Cu2O, point B showed metallic state and point C is Cu2O.
