Separation of Overlapped Lines in Two-Dimensional Electron-Spin-Envelope-Modulation (ESEEM) Spectroscopy

Song, Renming; Zhong, Yuancong; Noble, Christy; Pilbrow, John R.; Hutton, D. R.

doi:10.1006/jmra.1995.0777

Cited by 4 publications

(7 citation statements)

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“…The purpose of the present article is to justify the previously published 1-D and 2-D formulae [3,5,8,11] by providing a detailed descfiption of how the time~ domain signal is acquired and to show that the parametrization of the time va¡ ables suggested in reŸ 10 is inconsistent with this description. The equivalence of the MIF-ESEEM paramet¡ with that used by Hubrich et al [6] is highlighted and it is shown that MIF-ESEEM represents a natural extension to the special cases of y= 0, _+1.…”

Section: Introductionmentioning

confidence: 72%

“…(7) predict a scaling factor f= [1 w Y l of correlated spectral features: Figure 3 provides a simulation of the y-dependence of the 1-D MIF-ESEEM spectrum based upon the parametrization Eqs. (5). There exists a linear relationship between the MIF correlation peaks and the variable y, as predicted by Eqs.…”

Section: -D Nct Experimentsmentioning

confidence: 90%

“…2, this is a parametric equation describing the path of a straight line with gradient 7" = At2/At2 in the (x, y) = (tl, t2) plane, the signal obtained being a slice through the time domain of a 2-D ESEEM expe¡ From Eqs. (5), it is evident that the time domain signat S(y, t) acquired asa function of t is a projection of the slice onto the t = t I -t~0 time axis.…”

Section: -D Nct Experimentsmentioning

confidence: 99%

“…Both approaches yield equivalent Fourier transform (FT) spectra in an S = 1/2, I = t/2 system, provided the NC generator consists of nonselective microwave pulses so that the upper and lower M s manifolds are affected equally. Such incrementation schemes have been termed basic frequency [3][4][5] or nuclear frequency (NF) [6] experiments, since the basic nuclear frequencies c% and cop are detected.…”

Section: Introductionmentioning

confidence: 99%

“…In reŸ 6, the above three schemes were combined into four different 2-D correlation experiments. Song et al also published a description of 1-D and 2-D experiments in which t 2 is linearly constrained to tt by a factor 7" that is not restricted to the above cases of 0 and +_ 1, providing examples for both homogeneous [3,5,8] and inhomogeneous [9] broadening. They referred to these experiments as mixing-frequency electron spin-echo envelope modulation (MIF-ESEEM).…”

Section: Introductionmentioning

confidence: 99%

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On the theory of mixing-frequency electron spin-echo envelope modulation spectroscopy

Drew

Pilbrow

2002

Appl. Magn. Reson.

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It has recently been stated that the parametrization of the time variables in the one-dimensional (l-D) mixing-frequency electron spin-echo envelope modulation (MIF-ESEEM) experiment is incorrect and hence the wrong frequencies for correlated nuclear transitions are predicted. This paper is a direct response to such a claim, its purpose being to show that the parametrization in 1-and 2-D MIF-ESEEM experiments possesses the same formas that used in other 4-pulse incrementation schemes and predicts the same correlation frequencies. We show that the parametrization represents a shearing transformation of the 2-D time-domain and relate the resulting frequency domain spectrum to the HYSCORE spectrum in terms of a skew-projection. It is emphasized that the parametrization of the time-domain variables may be chosen arbitrarily and affects rreither the computation of the correct nuclear frequencies nor the resulting resolution. The usefulness or otherwise of the MIF parameters [Yl > 1 is addressed, together with the validity of the original claims of the authors with respect to resolution enhancement in cases of purely homogeneous and inhomogeneous broadening. Nume¡ simulations are provided to illustrate the main points.

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