G. Jeschke et al., Pure absorption electron spin echo envelope modulation spectra by using the filter-diagonalization method for harmonic inversion, J MAGN RES, 137(1), 1999, pp. 221-230
Harmonic inversion of electron spin echo envelope (ESEEM) time-domain signa
ls by filter diagonalization is investigated as an alternative to Fourier t
ransformation. It is demonstrated that this method features enhanced resolu
tion compared to Fourier-transform magnitude spectra, since it can eliminat
e dispersive contributions to the line shape, even if no linear phase corre
ction is possible. Furthermore, instrumental artifacts can be easily remove
d from the spectra if they are narrow either in time or frequency domain. T
his applies to echo crossings that are only incompletely eliminated by phas
e cycling and to spurious spectrometer frequencies, respectively. The metho
d is computationally efficient and numerically stable and does not require
extensive parameter adjustments or advance knowledge of the number of spect
ral lines. Experiments on gamma-irradiated methyl- alpha-D-glucopyranoside
show that more information can be obtained from typical ESEEM time-domain s
ignals by filter-diagonalization than by Fourier transformation. (C) 1999 A
cademic Press.