Emission channeling studies of Indium Phosphide at low temperatures at CERN-ISOLDE

• Autor(es): Amorim, Lígia Marina Pinto de Almeida
• Data: 2009
• Identificador Persistente: http://hdl.handle.net/10451/3487
• Origem: Repositório da Universidade de Lisboa
• Assunto(s): Física nuclear; Teses de mestrado - 2009
• Tipo de Documento: Dissertação de Mestrado
• Idioma: Inglês
• Orientador(es): Peralta, Luís Filipe dos Santos Garcia, 1961-; Wahl, Ulrich, 1961-

Descrição

Tese de mestrado, Física (Física Nuclear e Partículas), Universidade de Lisboa, Faculdade de Ciências, 2009 111In radioactive atoms were implanted into a single crystal of InP. After annealing for lattice recovery of implantation defects, the lattice site location of 111In/111Cd was studied with the emission channelling technique, from room temperature ( 300K) down to 50K at CERN-ISOLDE 2.This work aims to test a recently developed cooling station for emission channelling experiments. InP is a material with a relatively low Debye temperature, where significant changes of atomic vibrations are expected with temperature, thus providing an ideal test ground of the effects, which can be expected to influence the data, i.e., dechanneling from lattice vibration and changes of the root mean square displacement (r.m.s.) of the atomic position of the probe atom. In the future we intend to apply these studies to monitor individual impurities or lattice constituents, with temperature, upon phase transitions as well as studying lattice sites of dopants implanted at low temperature. 2"The On-Line Isotope Mass Separator ISOLDE is a facility dedicated to the production of a large variety of radioactive ion beams for a great number of different experiments" http://isolde.web.cern.ch/ISOLDE/