Nitroxide Spin−Relaxation over the Entire Motional Range
The Journal of Physical Chemistry B2004Vol. 108(13), pp. 4196–4198
Citations Over TimeTop 14% of 2004 papers
Abstract
Homogeneous line widths, characterized by the phase memory time, Tm, of a nitroxide spin-labeled peptide, were measured over the entire motional range (∼10-10−10-4 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 Tm versus temperature curve (from 192 to 310 K) clearly resolves the Tm minimum, which provides great sensitivity to the details of molecular dynamics.
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