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We adapt the method of Monte Carlo configuration interaction to calculatecore-hole states and use this for the computation of X-ray emission andabsorption values. We consider CO, CH$_{4}$, NH$_{3}$, H$_{2}$O, HF, HCN,CH$_{3}$OH, CH$_{3}$F, HCl and NO using a 6-311G** basis. We also look atcarbon monoxide with a stretched geometry and discuss the dependence of itsresults on the cutoff used. The Monte Carlo configuration interaction resultsare compared with EOM-CCSD values for X-ray emission and with experiment forX-ray absorption. Oscillator strengths are also computed and we quantify themultireference nature of the wavefunctions to suggest when approaches based ona single reference would be expected to be successful.

Multireference X-Ray Emission and Absorption Spectroscopy calculations from Monte Carlo Configuration Interaction