Qhov sib txawv tseem ceeb ntawm FTIR thiab Raman spectroscopy yog cov txheej txheem FTIR ntsuas ntau npaum li cas lub teeb tseem tshuav ntawm lub teeb qub los ntawm lub teeb ci, qhov Raman spectroscopy ntsuas lub zog uas tawg tom qab tau zoo siab los ntawm laser.
FTIR cov txheej txheem thiab Raman spectroscopy ntsuas kev sib cuam tshuam ntawm lub zog nrog cov ntawv cog lus hauv cov qauv ntawm cov khoom xav tau (tsis paub).
FTIR yog dab tsi?
Lub sij hawm FTIR sawv rau Fourier Transform Infrared Spectroscopy. Fourier Transform Infrared spectrometer yog qhov cuab yeej peb siv tau rau qhov kev tshuaj ntsuam no. Cov cuab yeej no yog ib qho tseem ceeb hauv cov organic synthesis, polymer science, petrochemical engineering, kev lag luam kws tshuaj, thiab tshuaj xyuas zaub mov. Tsis tas li ntawd, FTIR spectrometers txuas nrog chromatography los ntawm cov txheej txheem ntawm cov tshuaj tiv thaiv tshuaj thiab muaj cov tshuaj tsis ruaj khov tuaj yeem tshawb xyuas.
FTIR cov txheej txheem tsom xam yog suav tias yog lub cim thib peb IR spectrometer tsom xam txheej txheem. Lub teeb liab rau lub suab nrov piv ntawm cov spectrum muab los ntawm cov txheej txheem no yog qhov siab dua li yav dhau los tiam IR spectrometers. Lwm qhov txiaj ntsig tseem ceeb ntawm cov txheej txheem no suav nrog qhov tseeb ntawm tus lej wavenumber, lub sijhawm luv luv scan ntawm txhua zaus, qhov dav scan ntau, thiab txo kev cuam tshuam los ntawm lub teeb tsis pom kev.
Muaj ntau yam khoom hauv FTIR spectrometer: nws muaj qhov chaw, interferometer, piv txwv li, ntes, amplifier, A / D converter, thiab lub computer. Lub hauv paus uas peb siv tuaj yeem tsim cov hluav taws xob uas tuaj yeem dhau los ntawm cov qauv thiab los ntawm interferometer, uas tuaj yeem ncav cuag lub ntsuas. Tom qab ntawd, lub teeb liab yuav tsum tau amplified thiab hloov mus rau hauv cov teeb liab digital los ntawm lub amplifier thiab yog analog mus rau digital converter, feem.
Raman Spectroscopy yog dab tsi?
Raman spectra lossis Raman spectrum yog ib qho kev tshuaj ntsuam xyuas uas nyob rau ntawm qhov tsis muaj zog tawg ntawm photons hauv cov qauv. Lub inelastic tawg yog hu ua Raman tawg. Cov txheej txheem no muaj txiaj ntsig zoo hauv kev txiav txim siab cov qauv vibrational ntawm molecules. Yog li ntawd, Raman tawg ua rau muaj txiaj ntsig zoo hauv analytical chemistry rau muab cov qauv ntiv tes uas peb tuaj yeem txheeb xyuas cov molecules sib txawv.
Daim duab 01: Lub Zog Qib Daim Duab rau Raman Spectroscopy
Radiation hom peb tuaj yeem siv rau hauv kev tshawb pom ntawm Raman spectra suav nrog pom, ze IR, lossis ze ntawm UV ntau yam laser kab teeb. Txawm li cas los xij, nyob ze X-ray teeb teeb kuj tseem siv tau ntawm no. Nyob rau hauv cov txheej txheem no, lub laser beam reacts nrog lub molecular vibrations los yog phonons, uas ua rau lub zog ntawm lub laser photons raug hloov los yog down.
Qhov txawv ntawm FTIR thiab Raman Spectroscopy yog dab tsi?
FTIR thiab Raman spectroscopy yog ob hom kev tshuaj ntsuam xyuas. FTIR yog Fourier Transform Infrared Spectroscopy thaum Raman spectroscopy yog cov txheej txheem tshuaj xyuas uas nyob ntawm qhov tsis sib xws ntawm cov photons hauv cov qauv. Qhov sib txawv tseem ceeb ntawm FTIR thiab Raman spectroscopy yog cov txheej txheem FTIR ntsuas ntau npaum li cas lub teeb tseem tshuav ntawm lub teeb qub los ntawm lub teeb ci, qhov Raman spectroscopy ntsuas lub zog uas tawg tom qab tau zoo siab los ntawm laser.
Hauv qab no yog cov ntsiab lus ntawm qhov sib txawv ntawm FTIR thiab Raman spectroscopy hauv daim ntawv teev npe.
Summary – FTIR vs Raman Spectroscopy
Lub sij hawm FTIR sawv rau Fourier Transform Infrared Spectroscopy. Raman spectro los yog Raman spectroscopy yog ib qho kev soj ntsuam cov txheej txheem uas nyob ntawm qhov tsis muaj zog tawg ntawm photons hauv cov qauv. Qhov sib txawv tseem ceeb ntawm FTIR thiab Raman spectroscopy yog cov txheej txheem FTIR ntsuas ntau npaum li cas lub teeb tseem tshuav ntawm lub teeb qub los ntawm lub teeb ci, qhov Raman spectroscopy ntsuas lub zog uas tawg tom qab tau zoo siab los ntawm laser.
