Tunneling processes in afterglow of calcite

摘要: A study of thermoluminescence and isothermal decay calcite synthetic single crystals after electronic irradiation shows that a new, weak, low temperature emission precedes the “360 K” glow peak (related with manganese): it has same spectrum as peak, intensity varies in inverse proportion to time does not depend on wide range (LNT 180 K). These two emissions are accounted for by model charge transfer taking place between traps manganese centers through competing tunneling processes. One starts from fundamental level is athermal. The other starting thermally excited 0.62 eV higher, gives rises 360 K peak. Une etude de la et du declin isotherme monocristaux synthetique apres bombardement electronique montre qu'une nouvelle basse faible intensite precede le pic attribue au manganese: elle měme spectre d'emission que ce pic, son varie en raison temps independamment dans un grand domaine, 77 environ. Un modele rend compte ces deux par des transferts charges s'effectuant entre les pieges centres effects tunnels competitifs: l'un, qui part niveau fondamental piege, est athermique, l'autre, d'un excite thermiquement 0,62 dessus, donne K.