小粒子中^(103)Rh的核磁共振探索

EXPLORATION OF 103 Rh NMRIN SMALL RHODIUM PARTICLES

得到了大约３ｎｍ直径的被块钛支持或被多层膜保护着的铑（Ｒｈ）小粒了１０３Ｒｈ的核磁共振谱．谱线宽，而且相对于大块Ｒｈ金属的线，产生了稍微的移动．展宽和位移是依赖于尺寸的，但在２０Ｋ－８０Ｋ范围或１００Ｋ－２００Ｋ范围内是与温度无关的．

This paper obtains 103 Rh nuclear magnetic resoance (NMR) spectra of approximately 3nm diameter rhodium particles, supported on titania, or protected by a polymer film. The NMR lines are considerably broadened and slightly shifted with respect to those of the bulk metal. The broadening and the shift are size dependent, but temperature independent in the 20K 80K or in the 100 200K range. And gives a qualitative interpretation in terms of a site dependence of both the electron orbital (or chemical) and the electron spin (or Knight) shifts.