ULTRASONIC-ATTENUATION MEASUREMENTS IN NEUTRON-IRRADIATED QUARTZ - A MICROSCOPIC MODEL FOR THE TUNNELING STATES

Authors
KEPPENS V LAERMANS C COECK M
Citation
V. Keppens et al., ULTRASONIC-ATTENUATION MEASUREMENTS IN NEUTRON-IRRADIATED QUARTZ - A MICROSCOPIC MODEL FOR THE TUNNELING STATES, Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms, 116(1-4), 1996, pp. 511-515
Citations number
19
Categorie Soggetti
Physics, Nuclear","Nuclear Sciences & Tecnology","Instument & Instrumentation
Journal title
Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms → ACNP
ISSN journal
0168583X
Volume
116
Issue
1-4
Year of publication
1996
Pages
511 - 515
Database
ISI
SICI code
0168-583X(1996)116:1-4<511:UMINQ->2.0.ZU;2-7
Abstract
Ultrasonic attenuation measurements are carried out in neutron-irradia ted z-cut quartz for three different doses, in a frequency range from 70 to 320 MHz. The data are analyzed using the tunneling model, and th e typical TS-parameters are derived. A comparison with the results obt ained from similar x-cut samples shows that the coupling of the tunnel ing states with the longitudinal phonons is direction-dependent. This confirms the anisotropic behaviour of the tunneling stares and gives s upport to the microscopic picture of the TS as a rotation of coupled S iO4 tetrahedra.