Thermal Restructuring of F^+_2:S^<--> and F^+_2:O^<--> Centers in NaCl Crystals between 205 and 220 K

概要

論文の詳細を見る
Sjxtgle cry'stabs of Na(l'l cozataining N825 or NaOl-I ex1?ibited an absorption band at1.18 eV under illumination of light absorbed by tire F 1>and at roomn temperature afteradditive co]oratiox?. I"urtlaer illunaixaation at 80 K cltanged tlae peak positioxt from1.]8eV to 1.]4eV. Tlae bands arise frorn botla F7:S-- and Fj:O-- centers, inwlaich the F.'- center is: loosely bouzad by a S-- or O '- ioza (1.18 eV:t)'pe A) or mostcona)>actly bouutd (1.14 eV:ty)>e B). Keepi??g tlte saxnple at a desired term)cerature be-tw'eeun 205 and 220K re:;ulted in recovery of Lice peak )'>osition to 1.18 eV. Bxaergy forrecovery w'as estimated to be 0.50:0.01 eV and 0.54;0.02 eV for F,' :S-- andF.' :0 - cexaters, respec:tix'ely. Comparisox? of Lice erac:rgies w'itla tltat for rotation ofthe dipole axis of the F" -I-O-= pair, or for ntigratioxt of an anion vacancy suggeststotal 60 degree rotation of tlae F.' axis in tlae F; : S - = or F ; : O - center causes restrue-luring of t)te center frona tyjce B to A.[opticaI absorption, Iuminescexace, sulfer-perturbed Fj center, Nail, color l] center laser, tlternaal stabilitylJ
社団法人日本物理学会の論文
1992-10-15