lyuminisensiya

PPTX 21 pages 267.8 KB Free download

21 pages

FaylHub.uz

Download via Telegram

Size 267.8 KB

File type PPTX

Pages 21

Updated Dec 2025

Page preview (5 pages)

Scroll down 👇

1 / 21

chapter 15 lyuminisensiya lyuminisensiya moddalar, atomlar, molekulalar yoki ionlarning turli xil qo’zg’atuvchi omillar ta’sirida shu’lalanishi lyuminisensiya deyiladi. dkkdj klassifikatsiya yuzaga keltiruvchi omillarga ko’ra: fotolyuminisensiya katodolyuminisensiya rentgenolyuminisensiya tribolyuminisensiya kaidolyuminisensiya xemilyumisensiya davomiyligiga ko’ra: fosforosensiya flourosensiya fotolyuminisensiya chiqadigan nurlanish to’lqin uzunligi yutilganidan kattaroq bo’ladi. chunki uning bir qismi issiqlik sifatida tarqatiladi. agar nurlanish ultrabinafsha va ko’rinadigan nurlar sohasiga to’g’ri keladigan nurlanish ta’sirida yuzaga kelsa, bunday lyuminisensiya ftolyuminisensiya deyiladi. fotolyuminisensiya tarmoqli bo'shliqni aniqlash. yarimo'tkazgichlarda eng keng tarqalgan radiatsion o'tish o'tkazuvchanlik va valentlik diapazonidagi holatlar o'rtasida bo'lib, energiya farqi tarmoqli oralig'i deb nomlanadi. nopoklik darajasi va nuqsonlarni aniqlash. yarimo'tkazgichlarda radiatsion o'tishlar lokalizatsiya qilingan nuqson darajasini ham o'z ichiga oladi. ushbu darajalar bilan bog'liq bo'lgan fotoluminesans energiyasidan ma'lum nuqsonlarni aniqlash uchun foydalanish mumkin. stoks-lommel qoidasi lyuminisensiya spektri doimo yutilish spekrtidan o’ngroqqa siljigan bo’lib, ko‘pchilik moddalar uchun bu ko‘zgu simmetriyasi shaklida bo’ladi. bu maksimumlar orasidagi farq stoks siljishi deb ataladi. fotolyuminisensiya elektron spini paulini chiqarib tashlash printsipi …

2 / 21

olatidir, chunki toq elektron magnit maydonida ikkita yo'nalishni qabul qilishi mumkin, bu tizimga bir oz boshqacha energiya beradi barcha elektron spinlari juftlashgan molekulyar elektronlar holatiga singlet holat deyiladi va molekula magnit maydon ta'sirida elektron energiya darajalarining bo'linishi bo'lmaydi. absorbsiya va emissiya darajalari... foton nurlanishining yutilish tezligi juda katta, bu jarayon 10-14 dan 10-15 sek oralig’ida. boshqa tomondan, lyuminestsentsiya emissiyasi sezilarli darajada past darajada sodir bo'ladi. bu erda qo'zg'aladigan holatning davom etish jarayoni qo'zg'alish jarayoniga mos keladigan yutilish cho'qqisining molyar yutish qobiliyatiga teskari bog'liqdir.. so’nish jarayoni vibratsiyani yumshatish ichki konversiya tashqi konversiya tizimlararo o'tish fosforesans muayyan ta’sirlar ostida lyuminisensiya jarayoni kamayadi. bu hodisa so’nish deb ataladi. effect of concentration on fluorescence intensity konsentratsiyaning floresan intensivligiga ta'siri ● f=kvant samaradorligi = # molekulalar chiqaradigan / jami # molekulalar hayajonlangan ●(l/mol-sm) va b (sm) ularning odatiy ma'nolari bor ●po hodisada yorqin quvvat zichligi (watt/sm2) ● chiziqli munosabatlar, f = kc ● o'z-o'zini singdirish …

3 / 21

an the tungsten of hydrogen lamp. lamps: the most common source for filter fluorometer is a low-pressure mercury vapor lamp equipped with a fused silica window. for spectrofluorometers, a 75 to 450-w high-pressure xenon arc lamp in commonly employed. lasers: most commercial spectrofluorometers utilize lamp sources because they are less expensive and less troublesome to use. components of fluorometers and spectrofluorometers filters and monochromators: both interface and absorption filters have been used in fluorometers for wavelength selection of both the excitation beam and the resulting fluorescence radiation. most spectrofluorometers are equipped with at least one and sometimes two grating monochromators. transducers: photomultiplier tubes are the most common transducers in sensitive fluorescence instruments. cell and cell compartments: both cylindrical and rectangular cell fabricated of glass or silica are employed for fluorescence measurements. fluorometer schematic fluorometer figure spektroftometr sxemasi spektrofotometr tuzilishi references http://www.acs.org http://www.cas.org http://www.chemcenter/org http://www.sciencemag.org http://www.kerouac.pharm.uky.edu/asrg/wave/wavehp.html http://www.chemistry.msu.edu/courses/cem333/chapter%2015%20-%20molecular%20luminescence%20spectrometry.pdf http://elchem.kaist.ac.kr/vt/chem-ed/spec/molec/mol-fluo.htm http://www.shsu.edu/~chm_tgc/chemilumdir/chemiluminescence2.html audio1.wav audio2.wav …

4 / 21

5 / 21

Want to read more?

Download all 21 pages for free via Telegram.

Download full file

About "lyuminisensiya"

chapter 15 lyuminisensiya lyuminisensiya moddalar, atomlar, molekulalar yoki ionlarning turli xil qo’zg’atuvchi omillar ta’sirida shu’lalanishi lyuminisensiya deyiladi. dkkdj klassifikatsiya yuzaga keltiruvchi omillarga ko’ra: fotolyuminisensiya katodolyuminisensiya rentgenolyuminisensiya tribolyuminisensiya kaidolyuminisensiya xemilyumisensiya davomiyligiga ko’ra: fosforosensiya flourosensiya fotolyuminisensiya chiqadigan nurlanish to’lqin uzunligi yutilganidan kattaroq bo’ladi. chunki uning bir qismi issiqlik sifatida tarqatiladi. agar nurlanish ultrabinafsha va ko’rinadigan nurlar sohasiga to’g’ri keladigan nurlanish ta’sirida yuzaga kelsa, bunday lyuminisensiya ftolyuminisensiya deyiladi. fotolyuminisensiya tarmoqli bo'shliqni aniqlash. yarimo'tkazgichlarda eng keng tarqalgan radiatsio...

This file contains 21 pages in PPTX format (267.8 KB). To download "lyuminisensiya", click the Telegram button on the left.

Tags: lyuminisensiya PPTX 21 pages Free download Telegram