Resonant twohyphen;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 18thinsp;400 to 19thinsp;100 cmminus;1. Most of these are assigned as members of theBthinsp;2Pgr;larr;Xthinsp;2Pgr; system, although an isolated band has been observed and assigned as the 2hyphen;0 band of theAthinsp;OHgr;rsquo;=0.5larr;Xthinsp;2Pgr;1/2system. A pair of strongly mixed levels are identified as resulting from a homogeneous spinndash;orbit perturbation between theAthinsp;OHgr;=0.5,vrsquo;=3 and theBthinsp;2Pgr;1/2,vrsquo;=1 levels, and the perturbation matrix element has been deduced to be 8.11 cmminus;1for27Al64Zn, 8.23 cmminus;1for27Al66Zn. The ground state has been unambiguously identified as a2Pgr;rstate with a bond length of 2.6957plusmn;0.0004 Aring;. 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.
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