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. 2010 Jul;205(1):109-13.
doi: 10.1016/j.jmr.2010.04.006. Epub 2010 Apr 24.

A signal-to-noise standard for pulsed EPR

Gareth R Eaton  1 , Sandra S Eaton, Richard W Quine, Deborah Mitchell, Velavan Kathirvelu, Ralph T Weber
Affiliations

A signal-to-noise standard for pulsed EPR

Gareth R Eaton et al. J Magn Reson. 2010 Jul.

Abstract

A 2 mm diameter by 10mm long cylinder of fused SiO2 (quartz) gamma-irradiated to 1 kGy with 60Co contains about 2x10(16) spins/cm3. It is proposed as a standard for monitoring signal-to-noise (S/N) performance of X-band pulsed EPR spectrometers. This sample yields S/N of about 25 on modern spin echo spectrometers, which permits measurement of both signal and noise under the same conditions with an 8-bit digitizer.

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Figures

Figure 1
Figure 1
Electron spin echoes from the 2 mm diameter, 10 mm long, fused quartz sample irradiated to 1 kGy, show the effect on the echo shape of the bandwidth of the microwave B1. The echo in the lower curve was created with 10, 20 ns pulses, which excited the entire spectrum, and the echo in the upper curve was created with more selective 40, 80 ns pulses.
Figure 2
Figure 2
T1 measured at several positions along the EPR spectrum, which is displayed as the first integral of the derivative spectrum.
See this image and copyright information in PMC

References

    1. Eaton SS, Eaton GR. Irradiated Fused-Quartz Standard Sample for Time-Domain EPR. J. Magn. Reson. 1993;102:354–356.
    1. Imai H, Hirashima H. Intrinsic- and Extrinsic-Defect Formation in Silica Glasses by Radiation. J. Non-Crystalline Solids. 1994;179:200–213.
    1. Ludowise P, Eaton SS, Eaton GR. A Convenient Monitor of EPR Automatic Frequency Control Function. J. Magn. Reson. 1991;93:410–412.
    1. Ghim BT, Eaton SS, Eaton GR, Quine RW, Rinard GA, Pfenninger S. Magnetic Field and Frequency Dependence of Electron Spin Relaxation Times of the E' Center in Irradiated Vitreous Silica. J. Magn. Reson. A. 1995;115:230–235.
    1. Quine RW, Eaton GR, Eaton SS. Pulsed EPR Spectrometer. Rev. Sci. Instrum. 1987;58:1709–1723.

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