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Contributions to the Gaussian Line Broadening of the Proxyl Spin Probe EPR Spectrum Due to Magnetic-Field Modulation and Unresolved Proton Hyperfine Structure by Barney L. Bales; Miroslav Peric; Maria Teresa Lamy-Freund is a Chemistry article available to read on EtoBox.

What is Contributions to the Gaussian Line Broadening of the Proxyl Spin Probe EPR Spectrum Due to Magnetic-Field Modulation and Unresolved Proton Hyperfine Structure about?

A simple expression is derived to compute the total Gaussian linewidth of a Voigt line that is broadened by sinusoidal magneticfield modulation as follows: where ⌬H pp G (H m ) is the Gaussian linewidth observed with an modulation amplitude H m /2 and ⌬H pp G (0) is the Gaussian linewidth in the limit of zero modulation. The field modulation contributes an additional Gaussian broadening of H m , where is a constant, which adds in quadrature to ⌬H pp G (0) to give the total Gaussian linewidth. Denoting the overall linewidth of the Voigt line in the absence of modulation broadening by ⌬H pp 0 (0), it is shown, both by analytical means and by spectral simulation, that the constant is equal to 1/2 in the limit of H m Ӷ ⌬H pp 0 (0); however, using values of H m as large as ⌬H pp 0 (0) leads to only minor departures from ‫؍‬ 1/2. The formulation is valid both for Lorentzian and Voigt lines and is tested for 2,2,5,5-tetramethylpyrrolidin-1-oxyl-3-carboxylic acid (3-carboxy proxyl) in CCl 4 and in aqueous buffer. This spin probe was studied because the proxyl group is the only major spin-probe moiety whose Gaussian linewidth had not been characterized in the literature. For 3-carboxy proxy

Who reads Contributions to the Gaussian Line Broadening of the Proxyl Spin Probe EPR Spectrum Due to Magnetic-Field Modulation and Unresolved Proton Hyperfine Structure?

Author

Barney L. Bales; Miroslav Peric; Maria Teresa Lamy-Freund

Publisher

Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 1090-7807)

Published

1998

Language

EN

Field

Chemistry (Physical Sciences)