Resonant two-photon ionization spectroscopy of jet-cooled NiPt

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Abstract
Resonant two-photon ionization spectroscopy of jet-cooled NiPt has been used to investigate the possibility of d-electron contributions to the bonding in this species. Based on an abrupt onset of predissociation, the bond strength of NiPt is assigned as D0(NiPt)=2.798±0.003 eV. Comparisons of scans using ArF (6.42 eV) or F2 (7.87 eV) radiation as the ionization laser yield IP(NiPt)=8.02±0.15 eV, from which we derive D0(Ni+–Pt)=2.41±0.15 eV and D0(Ni–Pt+) =3.58±0.35 eV. High resolution studies of the 6–0 and 8–0 bands of one of the three identifiable progressions demonstrate an Ω′=0←Ω″=0 transition with r′e =2.3396±0.0039Å and r″0 =2.2078±0.0023Å. The short bond length and large bond strength of NiPt, as compared to the corresponding values (re=2.330±0.003Å and D0=2.34±0.10 eV) for the coinage metal analog, CuAu, demonstrate significant d-orbital contributions to the bonding in NiPt.

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