Nuclear Quadrupole Resonance in the Chalcogenide and Pnictide Amorphous Semiconductors.
UTAH UNIV SALT LAKE CITY DEPT OF PHYSICS
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The absence of long range periodic order in amorphous semiconductors makes the interpretation of the usual scattering experiments, such as x-ray, neutron or electron scattering, both difficult and model dependent. For this reason information concerning the static and dynamic properties of these solids must be gathered using many different experimental techniques. In the chalcogenide group VI and pnictide group V amorphous semiconductors nuclear quadrupole resonance NQR spectroscopy has proved to be one of the important techniques. The NQR technique provides information on a scale of the interatomic spacings and is thus a sensitive probe of the local environments of the major constituent atoms in an amorphous semiconductor. In the specific case of 75As, analyses of the NQR lineshapes and of nuclear spin-spin phenomena yield detailed structural information concerning not only the local bonding at an arsenic site but also the presence of intermediate range order in some chalcogenide glasses. The lineshapes also provide a very sensitive probe of photo-induced polymerization in films of amorphous chalcogenides.
- Atomic and Molecular Physics and Spectroscopy
- Solid State Physics