Electric charges, surface concentrations, and the dynamic behaviours of Cs, Re, and O on self-supported disk surface of Cs and Re-doped silver powder during the operation of O₂-Jet under UHV were examined using XPS. Pile-up and creep-in of doped elements, in analogy with O, were observed with heating and cooling of the sample, respectively. A drastic shift of Re 4 f_7/2 spectrum of 46.7 (Re₇₊) to 40.9 e V (Re⁰) took place when the sample was heated at 110 to 210°C, while Cs 3 d_5/2 only lay in the range of 724.8∼725.2 e V. Conspicuous transient responses to O₂-Jet were exhibited by the sample heated at 210°C; with increasing exposure time, the binding energy of Re 4 f_7/2 rapidly shifted from 40.9 (Re⁰) to 45.3 eV (Re⁶⁺), Cs 3 d_5/2 did so from 725.2 to 724.6 e V, and O 1s gradually became a twin peak of 530.5 and 528.9 e V, of which composition of five core spectra obtained by deconvolution was varied vigorously. The O 1s core spectrum of 528.8 eV assigned to oxydic oxygen and CS₂O was found only during the operation of O₂-Jet at 210°C.