Satellite structure in the atomic UV photoelectron spectra of Zn, Cd, and Hg observed at different wavelengths

Abstract

The dependence of satellite structure in the atomic UV photoelectron spectra of Zn, Cd and Hg on photon wavelength has been examined by using both Hel 584 Å and Hell 304 Å sources. Apart from work on He and some qualitative observations on other atoms, there have previously been no studies on the wavelength dependence of correlation satellite intensities. The main lines in the spectra correspond to ( n − 1)d 10 ns 2 S 1 2 and ( n − 1)d 9 ns 2 ; 2 D 5 2 and 2 D 3/2 final states, and the satellites are the ( n − 1)d 10 np ; 2 P 1 2 , 2 P 3 2 lines. The relative intensities of the satellites with respect to that of the 2 S 1 2 line are found to be essentially independent of photon energy for all three Group IIB atoms, strongly suggesting that their intensity is due in each case to the initial state configuration interaction (ISCI) mechanism. This result is consistent with the near degeneracy of the n s and n p shell energies, which facilitates strong admixture of the configuration ( n − 1)d 10 n p 2 ; 1 S into the ground state of these atoms.