Size-dependent study of Rb and K clusters using core and valence level photoelectron spectroscopyM.-H. Mikkelä, M. Tchaplyguine, K. Jänkälä, T. Andersson, C. Zhang, O. Björneholm and M. HuttulaEur. Phys. J. D, 64 2-3 (2011) 347-352DOI: https://doi.org/10.1140/epjd/e2011-20239-4