Abstract
We adapt the method of Monte Carlo configuration interaction to calculate core-hole states, and use this for the computation of X-ray emission and absorption energies. We consider CO, \(\hbox {CH}_{4}\), \(\hbox {NH}_{3}\), \(\hbox {H}_{2}\hbox {O}\), HF, HCN, \(\hbox {CH}_{3}\hbox {OH}\), \(\hbox {CH}_{3}\hbox {F}\), HCl and NO using a 6-311G** basis. We also look at carbon monoxide with a stretched geometry and discuss the dependence of its results on the cutoff used. The Monte Carlo configuration interaction results are compared with EOM-CCSD values for X-ray emission, and with experiment for X-ray absorption. Oscillator strengths are also computed, and we quantify the multireference nature of the wavefunctions to suggest when approaches based on a single reference would be expected to be successful or not.
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Acknowledgments
We thank the European Research Council (ERC) for funding under the European Union’s Seventh Framework Programme (FP7/2007-2013)/ERC Grant No. 258990.
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Coe, J.P., Paterson, M.J. Multireference X-ray emission and absorption spectroscopy calculations from Monte Carlo configuration interaction. Theor Chem Acc 134, 58 (2015). https://doi.org/10.1007/s00214-015-1656-0
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DOI: https://doi.org/10.1007/s00214-015-1656-0