PULSED AND CW-ESR STUDY OF E' AND AL HOLE-CENTERS IN QUARTZ PRODUCED BY IRRADIATIONS AND CRUSHING

E' centers in quartz irradiated by alpha-rays (He+-beam), neutrons, an d those produced by gamma-irradiation after crushing as well as in gam ma-irradiated silica glass were investigated using cw/pulsed electron spin resonance. Lineshape of E' centers produced by alpha-rays was sim ilar to that of centers produced by neutrons but different from that o f centers produced by gamma-irradiation in silica glass. E' centers in crushed quartz were localized in amorphous region presumably around d islocations. The obtained phase relaxation times, T-2, are 6.5 +/- 0.4 mu s (by alpha-rays), 15.9 +/- 1.0 mu s (by neutrons), 7.3 +/- 0.2 mu s (by crushing and gamma-rays) and 18.5 +/- 0.2 mu s (in glass) and a re compared with the linewidths and the ratios of homogeneous to inhom ogeneous broadening obtained from the microwave power dependence.