Calculations are also performed at B3LYP and CCSD levels (with the same basis set) with the LG(OI) approach and with LG at three different origins: O COM , O COC , and the CAM-B3LYP analytical origin (O An CAM ). All calculations were performed at the sodium D line, 589.3 nm, to avoid any issue with resonance, 1,50,67 using a development version of the Gaussian suite of programs .