A new mechanism for spin-lattice relaxation of heavy nuclei in the solid state:: 207Pb relaxation in lead nitrate

被引：24

作者：

Grutzner, JB ^{[1
]}

Stewart, KW

Wasylishen, RE

Lumsden, MD

Dybowski, C

Beckmann, PA

机构：

[1] Purdue Univ, Dept Chem, W Lafayette, IN 47907 USA

[2] Univ Alberta, Dept Chem, Edmonton, AB T6G 2G2, Canada

[3] Dalhousie Univ, Dept Chem, Halifax, NS B3H 4J3, Canada

[4] Univ Delaware, Dept Chem & Biochem, Newark, DE 19716 USA

[5] Bryn Mawr Coll, Dept Phys, Bryn Mawr, PA 19010 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2001年 / 123卷 / 29期

关键词：

D O I：

10.1021/ja0040924

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A detailed investigation of the spin-lattice relaxation time, T-1, for Pb-207 in solid lead nitrate has been undertaken in an effort to understand the mechanism of relaxation. The results show that the Pb-207 T-1 is independent of magnetic field strength and inversely proportional to the square of the temperature. These are signatures of relaxation by a spin-phonon Raman scattering mechanism. Nuclear spin-lattice relaxation in solid lead salts is more efficient for sites with smaller magnetic shielding anisotropy. A coupling mechanism is proposed whereby phonons create a local magnetic field by modulating the valence electron shell motion relative to the nuclear/electron core. Literature data suggest that spin-phonon scattering is a common relaxation pathway for other spin-1/2 heavy nuclei in solids.

引用

页码：7094 / 7100

页数：7

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