Free atom core binding energies from X-ray photoelectron spectroscopy. II. Na, K, Rb, Cs, and Mg

Gas phase photoelectron spectra of sodium, potassium, rubidium, cesium, and magnesium have been obtained with AlKα radiation. The binding energies measured are: Na 1s (1079.1 eV), K2p (303.2 eV, 300.5 eV), Rb 3p (254.3 eV, 245.4 eV), Cs 3d (745.8 eV, 731.8 eV), and Mg1s (1311.5 eV). Experimental and theoretical values from the literature have been compared with our results. The free atom binding energies were found to be greater than the comparative solid state binding energies; the differences being: Na 5.1 eV, K 3.6 eV, Rb 3.4 eV, Cs 3.4 eV, and Mg 4.8 eV. The multielectron excitation satellites present in the spectra of these atoms are also discussed.