Probing the electronic structure of warm dense nickel via resonant inelastic x-ray scattering حسب Humphries, OS, Marjoribanks, RS, Van Den Berg, QY, Galtier, EC, Kasim, MF, Vinko, SM, Lee, HJ, Miscampbell, AJF, Nagler, B, Royle, R, Wark, JS