Free precession decay of nuclear pairs in solids

Investigation of the characteristics of a single-frequency semiconductor laser with an external resonator

“…It is evident that especially for ESR there are many circumstances in which this method, which can be used for any line shape function, can be fruitfully applied; for instance, if the spectrum resolution is important, if there is a spectrum of lines with different widths, if there are short-lived radicals where there is no time to select the proper modulation amplitude, if the signals are weak, in line shape investigation, etc. Moreover, as has already been recognized by Svanson and Stenlof (1967) and van Baren et al (1972)) this method can also be used to determine accurately the modulation amplitude. For these reasons (and also because of the simplicity) we think that this procedure should be available as a standard tool between the LF output and the recorder, especially if the spectrometer has already a direct connection with a computer.…”

“…It follows that Equation (11) is also derived by Svanson and Stenlof (1967) and van Baren et al (1972). We note that as in the above no restriction has been made with respect to f(x), f(x) may be a line of arbitrary shape, or a spectrum of lines.…”

“…This method is restricted to not too large values of the modulation amplitude. In the second case the correction is performed with the aid of the Fourier transform of the distorted signal (Wilson 1963, Svanson and Stenlof 1967, van Baren et al 1972. This is consistent with the fact that the distorted signal can be expressed as a convolution of the undistorted line and a (known) broadening function (Flynn and Seymour 1960), so that according to the convolution theorem the Fourier transform G(t) consists of the product of the Fourier transforms of the true line F ( t ) and the broadening function B(t), respectively.…”