Oxygen impact on quantum confinement effect for silicon clusters in different size regimes: ab initio investigationsS. Chakraborty, Ch. Rajesh, S. Mahamuni and S.V. GhaisasEur. Phys. J. D, 64 2-3 (2011) 331-337DOI: https://doi.org/10.1140/epjd/e2011-10456-2