Mass Spectrometric Determination of the Dissociation Energies of CuTb(g), CuDy(g), and CuHo(g)
- 1 February 1979
- journal article
- research article
- Published by Wiley in Berichte der Bunsengesellschaft für physikalische Chemie
- Vol. 83 (2) , 161-167
- https://doi.org/10.1002/bbpc.19790830212
Abstract
The enthalpy changes of the reactions magnified image (M = Tb, Dy or Ho) could be determined by Knudsen effusion mass spectrometric studies vaporizing pure Cu and M‐Cu alloys. The following dissociation energies at 0 K were obtained for Cu2(g), TbCu(g), DyCu(g) and HoCu(g) in kJ mol−1: 190.2 ± 5.4, 187 ± 19, 140 ± 19 and 139 ± 19. The appearance potentials of the single charged ions of these molecules could be determined as 7.8 ± 0.4, 5.3 ± 0.3, 5.4 ± 0.4 and 5.3 ± 0.3 eV, respectively. The experimental dissociation energies for the heteronuclear diatomic molecules are compared with the theoretical predictions of the Pauling model of the polar bond.Keywords
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