Dysonian lineshape

In this section the Dysonian lineshape, arising from a skin depth shorther than the sample size, will not be mentioned. See [2] for this subject related to conducting polymers. 

Fig. 60. Line shapes of Gd-ESR experiments in normal and in the superconducting state of CeRuj. Note the strong deviations from a Dysonian lineshape in the sc state. From Baber-schke et al. (1974).

FIGURE 28. ESR signal from a polypyrrole coat showing a Dysonian lineshape. 

The EPR spectra of POT salts and bases show a single signal without hyperfine splitting. The EPR lineshape is almost Lorentzian for the salts as well as bases. There is no Dysonian effect [113] as noted from the much smaller sample thickness relative to the values of the skin depth. The values of skin depth ( ) were calculated using the relation [114]... 

Rg. 11-41 Evolution of the ESR signal for various levels of doping in chemically (a) and electrochemically (b) doped (CHyNa), [5.82] and (CHyLi [5.210], respectively. Ilie arrow shows the increasing field direction. At high doping levels, the lineshape is Dysonian in contrast to the Gaussian lineshape for the pure cis material. After Reference [440], reproduced with permission. 

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