Photoabsorption and photoemission of Cu near the3pthreshold

The photoabsorption and photoemission of Cu in the region of the $3p$ threshold have been calculated. The resonance in the ${\mathrm{Cu}}^{+}$ $3d^{8}4s^2$ emission due to super-Coster-Kronig decay is found to occur primarily in the ${}_{}{}^1{}_{}{}^{}G$ multiplet (62%) with lesser amounts in ${}_{}{}^3{}_{}{}^{}F$ and ${}_{}{}^1{}_{}{}^{}D$ (29% and 8%). We find a comparatively large nonresonant emission due to inelastic scattering into $3d^{9}4p$ final states which occurs at approximately the same binding energy as $3d^{8}4s^{23}F$. Shake-up processes, in particular those leading to $3d^{9}5s$, are shown to be important. It is concluded that interference in the $3p\to nd,\epsilon d$ channel leads to the dip in absorption found above the $3p\to 4s$ peaks.