Abstract
A Doppler-broadened spectrum and a lifetime spectrum from positron annihilation have been measured on zone-refined 2,3-dichloro-9,10-anthraquinone (DCAQ) single crystals, in which planar DCAQ molecules form a type of layered structure. The lifetime spectrum can be analyzed in terms of only a single exponentially decaying component of 310 ps, which indicates the absence of positronium in the crystal. The width of the Doppler-broadened annihilation spectrum is found to be dependent upon the direction of observation; the width for y∥a is narrower than that for the other direction. This reveals an anisotropic momentum distribution of electrons in the crystal, the averaged value of momenta along the molecular long axis being about 10% lower than that along the other molecular axis.
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