13 research outputs found
Ultra-fast relaxation of electrons in wide-gap dielectrics
Low-energy electrons scattered in the conduction band of a dielectric solid
should behave like Bloch electrons and will interact with perturbations of the
atomic lattice, i.e. with phonons. Thus the phonon-based description of
low-energy scattering within an energy band structure of a solid bears certain
advantages against common free-electron scattering mechanisms. Moreover, the
inelastic scattering is described by the dielectric energy loss function. With
these collective scattering models we have performed the simulation of excited
electron relaxation and attenuation in the insulator SiO2. After excitation to
a mean initial energy of several eV their energy relaxation occurs within a
short time interval of 200 fs to full thermalization. There is a very rapid
impact ionization cooling connected with cascading of electrons at the
beginning during the first 10 fs, followed by much slower attenuation due to
phonon losses in wide-gap dielectrics and insulators
Specific features of the thermoluminescence kinetics of shallow traps in anion-defective single crystals of aluminum oxide
The kinetics of thermoluminescence (TL) arising from shallow traps in single crystals of anion-defective aluminum oxide has been considered. It has been shown that the TL peak at 320-350 Π is characterized by identical kinetic parameters in samples containing various concentrations of shallow traps. Πinetic TL parameters for this peak have been calculated by analyzing of the luminescence isothermal decay curves, varying the heating rate, and the peak shape. An interactive relationship of shallow and dosimetric traps in the crystals under study has been supposed.ΠΡΠΎΠ²Π΅Π΄Π΅Π½ Π°Π½Π°Π»ΠΈΠ· ΠΊΠΈΠ½Π΅ΡΠΈΠΊΠΈ ΡΠ΅ΡΠΌΠΎΠ»ΡΠΌΠΈΠ½Π΅ΡΡΠ΅Π½ΡΠΈΠΈ (Π’Π), ΠΎΠ±ΡΡΠ»ΠΎΠ²Π»Π΅Π½Π½ΠΎΠΉ ΠΌΠ΅Π»ΠΊΠΈΠΌΠΈ Π»ΠΎΠ²ΡΡΠΊΠ°ΠΌΠΈ Π² ΠΌΠΎΠ½ΠΎΠΊΡΠΈΡΡΠ°Π»Π»Π°Ρ
Π°Π½ΠΈΠΎΠ½-Π΄Π΅ΡΠ΅ΠΊΡΠ½ΠΎΠ³ΠΎ ΠΎΠΊΡΠΈΠ΄Π° Π°Π»ΡΠΌΠΈΠ½ΠΈΡ. ΠΠΎΠΊΠ°Π·Π°Π½ΠΎ, ΡΡΠΎ Π’Π ΠΏΠΈΠΊΠ° ΠΏΡΠΈ 320-350 Π Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΠ·ΡΠ΅ΡΡΡ ΠΈΠ΄Π΅Π½ΡΠΈΡΠ½ΡΠΌΠΈ ΠΊΠΈΠ½Π΅ΡΠΈΡΠ΅ΡΠΊΠΈΠΌΠΈ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΠ°ΠΌΠΈ Ρ ΠΎΠ±ΡΠ°Π·ΡΠΎΠ² Ρ ΡΠ°Π·Π»ΠΈΡΠ½ΠΎΠΉ ΠΊΠΎΠ½ΡΠ΅Π½ΡΡΠ°ΡΠΈΠ΅ΠΉ ΠΌΠ΅Π»ΠΊΠΈΡ
Π»ΠΎΠ²ΡΡΠ΅ΠΊ. Π Π°ΡΡΡΠΈΡΠ°Π½Ρ ΠΊΠΈΠ½Π΅ΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΡ Π’Π ΡΡΠΎΠ³ΠΎ ΠΏΠΈΠΊΠ° ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ Π°Π½Π°Π»ΠΈΠ·Π° ΠΊΡΠΈΠ²ΡΡ
ΠΈΠ·ΠΎΡΠ΅ΡΠΌΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π·Π°ΡΡΡ
Π°Π½ΠΈΡ Π»ΡΠΌΠΈΠ½Π΅ΡΡΠ΅Π½ΡΠΈΠΈ, Π²Π°ΡΠΈΠ°ΡΠΈΠΈ ΡΠΊΠΎΡΠΎΡΡΠ΅ΠΉ Π½Π°Π³ΡΠ΅Π²Π° ΠΈ Π°Π½Π°Π»ΠΈΠ·Π° ΡΠΎΡΠΌΡ ΠΏΠΈΠΊΠ°. ΠΡΡΠΊΠ°Π·Π°Π½ΠΎ ΠΏΡΠ΅Π΄ΠΏΠΎΠ»ΠΎΠΆΠ΅Π½ΠΈΠ΅ ΠΎ Π½Π°Π»ΠΈΡΠΈΠΈ ΠΈΠ½ΡΠ΅ΡΠ°ΠΊΡΠΈΠ²Π½ΠΎΠΉ Π²Π·Π°ΠΈΠΌΠΎΡΠ²ΡΠ·ΠΈ ΠΌΠ΅Π»ΠΊΠΈΡ
ΠΈ Π΄ΠΎΠ·ΠΈΠΌΠ΅ΡΡΠΈΡΠ΅ΡΠΊΠΈΡ
Π»ΠΎΠ²ΡΡΠ΅ΠΊ Π² ΠΈΡΡΠ»Π΅Π΄ΡΠ΅ΠΌΡΡ
ΠΊΡΠΈΡΡΠ°Π»Π»Π°Ρ
.ΠΠΈΠΊΠΎΠ½Π°Π½ΠΎ Π°Π½Π°Π»iΠ· ΠΊiΠ½Π΅ΡΠΈΠΊΠΈ ΡΠ΅ΡΠΌΠΎΠ»ΡΠΌiΠ½Π΅ΡΡΠ΅Π½ΡiΡ (Π’Π), ΠΎΠ±ΡΠΌΠΎΠ²Π»Π΅Π½ΠΎΡ ΠΌiΠ»ΠΊΠΈΠΌΠΈ ΠΏΠ°ΡΡΠΊΠ°ΠΌΠΈ Π² Π°Π½iΠΎΠ½-Π΄Π΅ΡΠ΅ΠΊΡΠ½ΠΈΡ
ΠΌΠΎΠ½ΠΎΠΊΡΠΈΡΡΠ°Π»Π°Ρ
ΠΎΠΊΡΠΈΠ΄Ρ Π°Π»ΡΠΌiΠ½iΡ. ΠΠΎΠΊΠ°Π·Π°Π½ΠΎ, ΡΠΎ Π’Π ΠΏiΠΊΠ° ΠΏΡΠΈ 320- 350 Π Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΠ·ΡΡΡΡΡΡ iΠ΄Π΅Π½ΡΠΈΡΠ½ΠΈΠΌΠΈ ΠΊiΠ½Π΅ΡΠΈΡΠ½ΠΈΠΌΠΈ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΠ°ΠΌΠΈ Π΄Π»Ρ Π·ΡΠ°Π·ΠΊiΠ² Π· ΡiΠ·Π½ΠΈΠΌΠΈ ΠΊΠΎΠ½ΡΠ΅Π½ΡΡΠ°ΡiΡΠΌΠΈ ΠΌiΠ»ΠΊΠΈΡ
ΠΏΠ°ΡΡΠΎΠΊ. ΠΠ±ΡΠΈΡΠ»Π΅Π½ΠΎ ΠΊiΠ½Π΅ΡΠΈΡΠ½i ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΠΈ ΡΡΠΎΠ³ΠΎ ΠΏiΠΊΠ° ΠΌΠ΅ΡΠΎΠ΄Π°ΠΌΠΈ Π°Π½Π°Π»iΠ·Ρ ΠΊΡΠΈΠ²ΠΈΡ
iΠ·ΠΎΡΠ΅ΡΠΌiΡΠ½ΠΎΠ³ΠΎ Π·Π³Π°ΡΠ°Π½Π½Ρ Π»ΡΠΌiΠ½Π΅ΡΡΠ΅Π½ΡiΡ, Π²Π°ΡiΡΠ²Π°Π½Π½Ρ ΡΠ²ΠΈΠ΄ΠΊΠΎΡΡi Π½Π°Π³ΡiΠ²Π°Π½Π½Ρ ΡΠ° Π°Π½Π°Π»iΠ·Ρ ΡΠΎΡΠΌΠΈ ΠΏiΠΊΠ°. ΠΠΈΡΠ»ΠΎΠ²Π»Π΅Π½ΠΎ ΠΏΡΠΈΠΏΡΡΠ΅Π½Π½Ρ ΠΏΡΠΎ Π½Π°ΡΠ²Π½iΡΡΡ iΠ½ΡΠ΅ΡΠ°ΠΊΡΠΈΠ²Π½ΠΎΠ³ΠΎ Π²Π·Π°ΡΠΌΠΎΠ·Π²'ΡΠ·ΠΊΡ ΠΌiΠ»ΠΊΠΈΡ
ΡΠ° Π΄ΠΎΠ·ΠΈΠΌΠ΅ΡΡΠΈΡΠ½ΠΈΡ
ΠΏΠ°ΡΡΠΎΠΊ Ρ ΠΊΡΠΈΡΡΠ°Π»Π°Ρ
, ΡΠΎ Π΄ΠΎΡΠ»iΠ΄ΠΆΡΠ²Π°Π»ΠΈΡΡ