ZERO FIELD-ODMR AND EMISSION MICROWAVE DOUBLE-RESONANCE ON OPTICALLY-EXCITED SILOXENE/

The first zero field optically detected magnetic resonance experiments on siloxene as-prepared (Sx(ap)) and annealed (Sx(an)) revealed a sin gle inhomogeneously broadened signal reaching from 30 up to 100O MHz. It is attributed to a distribution of triplet states from electron hol e pairs (bound excitons?), whose spins are separated between 14 and 4. 5 Angstrom. Using emission/microwave double-resonance techniques, a we ak emission could be resolved in the long wavelength part of the broad photoluminescence (PL) spectrum of both materials. The maxima of thes e microwave affected emissions are shifted by 1100 cm(-1) for Sx(ap) a nd 1300 cm(-1) for Sx(an) against the PL maxima, respectively.