Interaction of an aluminum atom with a closed subshell metal atom: Spectroscopic analysis of AlZn

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Abstract
Resonant two-photon ionization spectroscopy has been employed to investigate diatomic AlZn produced by laser vaporization of a 1:2 Al:Zn alloy target disk in a supersonic expansion of helium. Several discrete transitions are reported in the energy range from 18 400 to 19 100 cm−1. Most of these are assigned as members of the B 2Π←X 2Π system, although an isolated band has been observed and assigned as the 2-0 band of the A Ω′=0.5←X 2Π1/2 system. A pair of strongly mixed levels are identified as resulting from a homogeneous spin–orbit perturbation between the A Ω=0.5, v′=3 and the B 2Π1/2, v′=1 levels, and the perturbation matrix element has been deduced to be 8.11 cm−1 for 27Al64Zn, 8.23 cm−1 for 27Al66Zn. The ground state has been unambiguously identified as a 2Πr state with a bond length of 2.6957±0.0004 Å. Comparisons to the results of the preceding article on the spectroscopy of AlCa are also provided, along with a discussion of the chemical bonding in AlZn in relation to AlCa, AlAr, and AlKr.