| Issue |
J. Chim. Phys.
Volume 78, 1981
|
|
|---|---|---|
| Page(s) | 901 - 908 | |
| DOI | https://doi.org/10.1051/jcp/1981780901 | |
| Published online | 29 May 2017 | |
Investigation of platinum particles by nuclear magnetic resonance*
1
Department of Physics and Astronomy and Materials Research Center, Northwestern University, Evanston, Illinois 60201.
2
Department of Physics, Duke University, Durham, North Carolina 27706.
3
Alfred P. Sloan fellow.
The properties of Pt195 nuclear magnetic resonance of small particles have been studied over a range of particle sizes from 33 A to 200 A using pulsed NMR techniques. An anomalous line width, more than an order of magnitude larger than that of bulk platinum for the smallest size sample, was discovered. The broadening was attributed to an intra-particle Knight Shift distribution resulting from electron spin density oscillations associated with the metal surface.
Résumé
Des particules de platine dans un domaine de taille variant entre 30 et 200 Å ont été étudiées par RMN pulsée du 195Pt. Une largeur de râle anormale (plus de dix fois la largeur relative au platine massique pour les particules de plus faible taille) a été observée. L'élargissement est attribué à une distribution de déplacements de Knight entre les particules qui résulte d'oscillations de densité de spin électronique associées à la surface du métal.
(*) Support for this work was obtained from the Materials Research Center of Northwestern University under the National Science Foundation — Materials Research Laboratory Program Grant No. 76-80847 and from the National Science Foundation Grant No. DMR-78-11660 and DMR-77-10635 and from the Alfred P. Sloan Foundation. The hospitality of the Institut für Festkörperforschung, Kernforschungsanlage Jülich, 5170 Jülich, Germany, during preparation of the manuscript (WPH) is gratefully acknowledged.
© Paris : Société de Chimie Physique, 1981