Photoinduced Paramagnetic States of Yellow Arsenic

Some aspects of the solid state physics of yellow arsenic

“…The feasibility of such an interpretation follows from an analysis of the temperature dependence of paramagnetic centre content for samples illuminated under the same conditions as for DTA measurements. The ESR signal of illuminated samples is close both in shape and in spectral position to the ESR signal of thermally polymerised a-As [35]. In the process of heating the samples, the concentration of paramagnetic centres, as determined from the photoinduced ESR signal, at first slowly decreases, then falls abruptly at ~2 2 0 K (Fig.…”

“…8. The contribution of the lone electron to the wave function yields a p-orbital of a twofold coordinated As atom, as well Under certain conditions (such as the initial stage of thermo-and photopolymerisation of y-As) the hyperfine splitting may be observed experimentally [35]. The ESR spectrum splits into four lines.…”

Photoinduced Phenomena in Sulphur Crystals and Films

“…Gs, 78.50.Ge In the recent years the interest in nonsilver photographic compounds has grown rapidly due to the high expense of silver. But on today no compounds have been found which would posess the high contrast in the low temperature range.Experimental investigations of the photoinduced properties of phosphous and arsenicum crystals have also been reported [1][2][3]. The additional absorption under the ultraviolet light in crystal P and As is caused by the shift of energy gap.…”

“…Experimental investigations of the photoinduced properties of phosphous and arsenicum crystals have also been reported [1][2][3]. The additional absorption under the ultraviolet light in crystal P and As is caused by the shift of energy gap.…”