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13.
Jedrska kvadrupolna resonanca
Trontelj, Zvonko, 1937-2024
Raziskovalna naloga obsega tri dele. V prvem študiramo fazne prehode v ▫$Rb_2ZnBr_4$▫ z jedrsko kvadrupolno resonanco ▫$^{81}Br$▫. Izmerili smo temperaturno odvisnost JKR ▫$Br$▫ v ▫$Rb_2ZnBr_4$▫ na ...temperaturnem intervalu 77 K do 420 K. Iz izmerjenih spektrov lahko sklepamo na obstoj strukturnih faznih prehodov pri T=130 K, T=200 K in pri T=355 K. Analizirali smo mrežno dinamiko in strukturo ▫$Rb_2ZnBr_4$▫. Izmerjene rezultate JKR ▫$^{81}Br$▫ pa smo kritično primerjali z dosedanjimi meritvami in analizami tega vzorca drugih avtorjev. Na koncu smo s preprostim modelom točkastega naboja analizirali razcep kvadrupolnih resonančnih črt pri prehodu iz paraelektrične v ikomenzurabilno fazo. V drugem delu obravnavamo JKR ▫$^{35}Cl$▫ v ▫$(CH_3)_4N(CCl_3COO)_2H$▫. Zgradili smo preprost superregenerativni oscilator, s katerim smo dopolnili meritve na tem vzorcu. V nizkotemperaturni fazi smo lahko sledili šest črt skoraj do prehoda pri 212 K. Tudi nad prehodom smo lahko z gotovostjo opazili dve črti od verjetnih treh. Tretji del podaja opis pulznega spektrometra za JKR. Pulzni spektrometer smo v tem letu dogradili in opravili z njim nekaj začetnih testnih meritev ter ocenili njegove zmogljivosti.
Type of material - research report
Publication and manufacture - Ljubljana : RSS : IMFM, 1980
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