Abstract
Pulsed nuclear-quadrupole-resonance (NQR) measurements have been performed on rhombohedral, orthorhombic, and amorphous (a −) arsenic. Measurements of T 1 provide evidence of low-frequency disorder modes in a-As. The NQR frequencies indicate that the bonding is predominately p-like in all three solids. The asymmetric NQR line shape of a-As is consistent with the distribution of dihedral angles implicit in the continuous random network models. The bond-angle distributions inferred from x-ray scattering and continuous-random-network models do not result primarily from a distribution in bond hybridizations.
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