Erratum: Matrix isolation studies of bimetallic molecules of transition metals (Fe-Co, Fe-Ni, Fe-Cu)

Abstract

PACS numbers: 99. 1O.+g, 76.80.+y, 35.20.Gs This article was printed incorrectly due to an error in page make-up. The entire article is reprinted below. r-1ATRIX ISOLATION STUDIES OF BIMETALLIC MOLECULES OF TRANSITION METALS(Fe-Co, Fe-Ni, Fe-Cu)* P. A. Montano West Virginia University, Morgantown, West Virginia 26506 ABSTRACTThe matrix isolation technique has been used in conjunction with Mossbauer spectroscopy to study simple molecules of Fe-X (X = Cu, Ni, Co). The metal atoms were isolated in a solid rare gas matrix at 4.2 K and the molecules were formed in the matrix. It was observed that there is an increase in the electron density at the ~Fe nucleus in going from Cu to Ni. The Fe-Ni molecule is the weakest bond of all the studied cases. It has an isomer shift very close to that of the iron monomer in rare gas solids. In Fe-Ni the quadrupole splitting of the MOssbauer spectrum is half the value of the fe-Fe molecule (4.05 mm/sec), indicating a different orbital ground state for the fe-Ni molecule. By constrast Fe-Co is stronger bound than Fe-Ni, this being reflected in a more positive isomer shift. Iron-cobalt multimers were also studied and their magnetic hyperfine splitting determined. Samples of iron-cobalt isolated in solid argon with a 25 at. % metallic concentrations showed a very similar behavior to that of disordered Fe-Co alloys. The Fe-Cu molecule shows a large isomer shift and a small magnetic moment at the iron site.

Double refractory bimetallic clusters: optical and extended Hueckel molecular orbital studies of the molybdenum-niobium (MoNb) molecule

“…• It would appear that a useful insight into the electronic and molecular properties of few-atom, multimetallic clusters can be obtained by a combination of metal-vapor cryochemical techniques with a suitable form of spectroscopy such as UVvisible,3 ESR,4 or Mossbauer. 5 We have recently demonstrated that very small, unimetallic and bimetallic clusters can be generated and trapped by simultaneously codepositing metal vapors with either a low-temperature, weakly interacting matrix1•3 or a functionalized liquid polymer at close to room temperature. 6 In rare-gas supports, the clusters can be fabricated either during the deposition process1•3 or within the solid matrix by annealing1•3 and cryophotoaggregation1•7 procedures.…”