| Titre : |
Etude de création de centres colorés dans le fluorure de lithium (LiF) irradié par des ions lourds rapides |
| Type de document : |
texte imprimé |
| Auteurs : |
Hamdani Benhacine, Auteur ; A. Meftah, Directeur de thèse |
| Editeur : |
جامعة الإخوة منتوري قسنطينة |
| Année de publication : |
2017 |
| Importance : |
98 f. |
| Format : |
30 cm. |
| Note générale : |
2 copies imprimées disponibles
|
| Langues : |
Français (fre) |
| Catégories : |
Français - Anglais
Physique
|
| Tags : |
Ions lourds rapides Plomb Centres colorés LiF Absorption optique Photoluminescence AFM Swift heavy ions Lead Color centers Optical absorption أيونات سريعة ثقيلة LiF مراكز F تراكم العيوب الامتصاص الضوئي PL A |
| Index. décimale : |
530 Physique |
| Résumé : |
Single crystals of LiF (Lithium Fluoride) were irradiated with ions lead of energy
ranging between 144 and 840 MeV for electronic stopping power varying between 10 and 20
keV/nm and fluences between 109 and 1011 ions/cm2/s at the GANIL (Grand Accélérateurs
d’Ions Lourds, Caen, France). The samples of LiF were analyzed, before and after irradiation,
by three experimental techniques: optical absorption, the photoluminescence and AFM (Atomic
Force Microscopy) and analyzed according to the fluence and the loss of electronic energy. The
results show that the modifications induced by irradiation are dominated by the creation of
simple defects (centers F) and aggregate defects (Fn centers) and that their concentration
increases with energy and fluence. The evolution of centers F according to the fluence made it
possible to determine the radius of traces along the ion trajectories, by using a simple model of
saturated tracks. The values of these radius lie between 9 and 22 nm and vary according to the
electronic loss of energy.
The accumulation of centers F according to the absorptive energy studied by optical
absorption shows that the average concentration of the center F is given mainly by the density
of average energy absorptive with a weak reduction above 1023 eV/cm3. The photoluminescence
made it possible to observe two very intense bands with 545 and 665 nm which correspond to
the emission of centers F3+ and F2 respectively. The analysis by AFM of damage induced on
the surfaces made it possible to deduce the evolution from radius of the tracks according to the
electronic loss of energy. The radius vary between 9 and 16 nm.
|
| Diplôme : |
Doctorat en sciences |
| En ligne : |
../theses/physique/BEN7077.pdf |
| Format de la ressource électronique : |
pdf |
| Permalink : |
index.php?lvl=notice_display&id=10524 |
Etude de création de centres colorés dans le fluorure de lithium (LiF) irradié par des ions lourds rapides [texte imprimé] / Hamdani Benhacine, Auteur ; A. Meftah, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2017 . - 98 f. ; 30 cm. 2 copies imprimées disponibles
Langues : Français ( fre)
| Catégories : |
Français - Anglais
Physique
|
| Tags : |
Ions lourds rapides Plomb Centres colorés LiF Absorption optique Photoluminescence AFM Swift heavy ions Lead Color centers Optical absorption أيونات سريعة ثقيلة LiF مراكز F تراكم العيوب الامتصاص الضوئي PL A |
| Index. décimale : |
530 Physique |
| Résumé : |
Single crystals of LiF (Lithium Fluoride) were irradiated with ions lead of energy
ranging between 144 and 840 MeV for electronic stopping power varying between 10 and 20
keV/nm and fluences between 109 and 1011 ions/cm2/s at the GANIL (Grand Accélérateurs
d’Ions Lourds, Caen, France). The samples of LiF were analyzed, before and after irradiation,
by three experimental techniques: optical absorption, the photoluminescence and AFM (Atomic
Force Microscopy) and analyzed according to the fluence and the loss of electronic energy. The
results show that the modifications induced by irradiation are dominated by the creation of
simple defects (centers F) and aggregate defects (Fn centers) and that their concentration
increases with energy and fluence. The evolution of centers F according to the fluence made it
possible to determine the radius of traces along the ion trajectories, by using a simple model of
saturated tracks. The values of these radius lie between 9 and 22 nm and vary according to the
electronic loss of energy.
The accumulation of centers F according to the absorptive energy studied by optical
absorption shows that the average concentration of the center F is given mainly by the density
of average energy absorptive with a weak reduction above 1023 eV/cm3. The photoluminescence
made it possible to observe two very intense bands with 545 and 665 nm which correspond to
the emission of centers F3+ and F2 respectively. The analysis by AFM of damage induced on
the surfaces made it possible to deduce the evolution from radius of the tracks according to the
electronic loss of energy. The radius vary between 9 and 16 nm.
|
| Diplôme : |
Doctorat en sciences |
| En ligne : |
../theses/physique/BEN7077.pdf |
| Format de la ressource électronique : |
pdf |
| Permalink : |
index.php?lvl=notice_display&id=10524 |
|
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