Nitroxide spin-relaxation over the entire motional range

被引：12

作者：

Bonora, M ^{[1
]}

Pornsuwan, S ^{[1
]}

Saxena, S ^{[1
]}

机构：

[1] Univ Pittsburgh, Dept Chem, Pittsburgh, PA 15260 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2004年 / 108卷 / 13期

关键词：

D O I：

10.1021/jp0365864

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Homogeneous line widths, characterized by the phase memory time, T., of a nitroxide spin-labeled peptide, were measured over the entire motional range (similar to10(-10)-10(-4) s at the spectrometer resonance frequency of 9.7 GHz) using spin-echo correlated spectroscopy (SECSY) ESR. Phase memory times as short as 20 ns could be determined by using schemes designed to minimize the effects of pulse ring-down. Experimental T-m versus temperature curve (from 192 to 310 K) clearly resolves the T-m minimum, which provides great sensitivity to the details of molecular dynamics.

引用

收藏

页码：4196 / 4198

页数：3

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