Hi everyone, My lab mates are running in-situ H2 reduction of Cobalt/SiO2 catalysts using the Co K-edge and are obtaining differences between the fluorescence and transmission signals. The in-situ cell does have quite a bit of sample thickness (2-3 mm approx) and I was wondering if the fluorescence signal only has a penetration depth of a few micrometers. If this is the case that would explain it where the side that is further away from the heating element is more oxidized than the rest of the sample. Has anyone run into this problem before? We're using the basic furnace/cryostat unit (in-situ cell manufactured by the exafsco) and a 13 element fluorescence detector (germanium diode). I appreciate any insight into the issue, I have attached a fluorescence and transmission spectrum collected at the same time where the transmission and fluorescence are in the .prj file. Thanks so much! Andrew