Microwave diamagnetic resonance associated with polysiloxanes

Optical emission of polysiloxanes by electron diamagnetic resonance excitation

“…Both (A) and (B) were taken with approximately 20 m/z band pass. It is not clear whether the narrower lines in the resonance-excited emission are the result of the preferred orientation of the film [1] or the method of excitation.…”

“…Recently we observed microwave diamagnetic resonance which was found to be associated with thin films of certain methyl-phenyl substituted siloxanes [1]. In this note we report the observation of optical emission from the films during diamagnetic resonance excitation, and the comparison of its spectral distribution with that of ultra-violet-induced emission from bulk polysiloxane.…”

“…The group of bands at 470 mff are the emission from phenyl groups which absorb at 250-290 m/z [1]. Although monochromator ' cross talk' prevented the positive identification of the 350 mff group, it is probable that it has the same origin since the phenyl absorption and the emission patterns have the same five-line pattern.…”

“…The effect appeared to be due to adsorbed gas on the substrates rather than in cavity vacuum space. Since the carrier mean-collision lifetime was relatively unaffected by the residual gas [1], it was concluded that the increase in the number of carriers was the result of (a) decrease in the recombinatioll probability or (b) donation of additional carriers by the increased adsorbed gas concentration. It is possible that the process is impurity catalyzed [2].…”

“…Films of D.C.704 siloxane were evaporated upon transparent substrates (LiF or KBr) which were mounted on the end wall of an evacuated, cryostated TE102cavity [1]. The light generated by the diamagnetic resonance was passed through a LiF window, a hollow light-pipe, Coming filters or a Bausch-Lomb monochromator, and thence to a P.M. tube.…”