• Citer

Mass spectrometric determination of the dissociation energies of the molecules AgAu, AgCu, and AuCu

par Ackerman, Marcel ;Stafford, Fred F.E.;Drowart, Jean
Référence The Journal of Chemical Physics, 33, 6, page (1784-1789)
Publication Publié, 1960

Article révisé par les pairs

• Détails
• Contenu

Résumé :

The vapors issuing from mullite and graphite Knudsen cells containing pure metals and alloys of the triad Cu-Ag-Au have been analyzed mass spectrometrically. From the experimental ratios of diatomic to monoatomic species and the vapor pressures of the elements, the following dissociation energies are obtained: D 0 0(Cu 2) = 45.5±2.2 kcal D 0 0(AgAu) = 47.6±2.2 kcal D 0 0 (Ag 2) = 37.6±2.2 kcal D 0 0 (AgCu) = 40.7±2.2 kcal D 0 0(Au 2) = 51.5±2.2 kcal D 0 0(AuCu) = 54.5±2.2 kcal These are based on ΔH 298 vap=81.1, 68.4, and 87.5 kcal/g-atom for Cu, Ag, and Au where D 0 0 of AgCu depends on the value for Cu, and D 0 0 of AgAu and AuCu on Au. The uncertainties quoted do not include the uncertainty in ΔH vap.