Qhov sib txawv tseem ceeb ntawm fermi resonance thiab overtones hauv IR spectra yog tias fermi resonance yog kev hloov ntawm lub zog thiab kev siv zog ntawm kev nqus bands hauv IR spectra lossis Raman spectra, whereas overtones hauv IR spectra yog spectral bands uas tshwm sim hauv ib qho Kev vibrational spectrum raws li kev hloov pauv ntawm cov molecule los ntawm lub xeev hauv av mus rau lub xeev zoo siab thib ob.
IR spectra lossis IR spectrum yog qhov tshwm sim ntawm IR spectroscopy, qhov twg IR hluav taws xob siv los ntsuas tus qauv. Ntawm no, peb tuaj yeem soj ntsuam kev sib cuam tshuam ntawm cov teeb meem thiab IR hluav taws xob. Peb tuaj yeem tau txais IR spectra los ntawm kev nqus spectroscopy. IR spectroscopy yog siv rau kev txheeb xyuas thiab tshuaj xyuas cov tshuaj hauv ib qho qauv. Cov qauv no tuaj yeem yog cov khoom, kua lossis roj. Infrared spectrophotometer yog cov cuab yeej peb siv rau cov txheej txheem no. IR spectrum yog ib daim duab, thiab nws muaj qhov nqus ntawm lub teeb los ntawm cov qauv hauv y-axis thiab wavelength lossis zaus ntawm IR teeb hauv x-axis. Chav tsev ntawm zaus peb siv ntawm no yog qhov sib txuam centimeters (ib centimeter lossis cm-1). Yog tias peb siv wavelength hloov zaus, ces chav ntsuas yog micrometers.
Fermi Resonance yog dab tsi?
Fermi resonance yog qhov hloov pauv ntawm lub zog thiab kev siv zog ntawm cov adsorption bands hauv IR spectrum lossis Raman spectrum. Lub xeev resonance no yog tsim los ntawm lub quantum mechanical wavefunction mixing. Lub tswv yim no tau qhia los ntawm Italian physicist Enrico Fermi, tom qab uas lub resonance no muaj npe.
Yog tias muaj fermi resonance tshwm sim, muaj ob yam uas yuav tsum tau txaus siab: (1) hloov pauv ntawm ob hom kev vibrations ntawm ib lub molecule raws li tib yam irreducible sawv cev nyob rau hauv lub molecular point pawg (lub ntsiab lus hais tias lub symmetry ntawm lub molecule. ob lub vibrations yuav tsum zoo sib xws) (2) kev hloov pauv muaj lub zog zoo sib xws.
Daim duab 1: Qhov Zoo Tshaj Plaws Zoo Tshaj Plaws ntawm Hom Ib Leeg thiab Kev Tshaj Tawm Ua Ntej thiab Tom Qab Qhov tshwm sim ntawm Fermi Resonance
Feem ntau, yog tias qhov tseem ceeb thiab kev ua siab ntev yuav luag sib luag nrog Fermi resonance hauv lub zog, Fermi resonance tshwm sim ntawm qhov tseem ceeb thiab kev ua siab ntev. Ntxiv mus, muaj ob qhov cuam tshuam loj ntawm spectrum lead los ntawm Fermi resonance:
- Kev hloov pauv ntawm lub zog siab mus rau lub zog siab dua thiab hloov ntawm hom qis zog mus rau qis zog
- Kev siv zog ntau dua ntawm hom tsis muaj zog thaum lub zog hnyav dua yuav txo qis hauv kev siv
Dab tsi yog Overtones hauv IR Spectra?
Overtone hauv IR spectrum yog cov spectral band uas muaj nyob rau hauv lub vibrational spectrum ntawm ib tug molecule thaum lub molecule no hloov los ntawm lub hauv av xeev mus rau lub thib ob zoo siab lub xeev. Hauv lwm lo lus, kev hloov pauv ntawm cov molecule tshwm sim ntawm v=0 rau v=2 qhov twg v yog tus lej vibrational quantum. Peb tuaj yeem tau txais v los ntawm kev daws qhov sib npaug Schrodinger rau qhov tshwj xeeb molecule.
Daim duab 02: Schrodinger Equation
Feem ntau, thaum kawm txog kev vibrational spectra ntawm molecules, cov tshuaj tiv thaiv kev vibrations zoo li kwv yees li yooj yim harmonic oscillators. Yog li ntawd, peb xav tau ib tug quadratic peev xwm los siv nyob rau hauv lub Schrodinger kab zauv nyob rau hauv thiaj li yuav daws tau cov vibrational zog eigenvalues. Feem ntau, cov xeev lub zog no yog quantized, thiab lawv tsuas muaj qhov tseem ceeb rau lub zog. Yog hais tias peb dhau electromagnetic hluav taws xob los ntawm cov qauv, cov molecules yuav nqus lub zog los ntawm EMR thiab hloov lub vibrational zog lub xeev ntawm lub molecule.
Dab tsi yog qhov txawv ntawm Fermi Resonance thiab Overtones hauv IR Spectra?
Qhov sib txawv tseem ceeb ntawm Fermi resonance thiab overtones hauv IR spectra yog qhov Fermi resonance yog kev hloov ntawm lub zog thiab kev siv zog ntawm kev nqus bands hauv IR spectra lossis Raman spectra, whereas overtones hauv IR spectra yog spectral bands uas tshwm sim hauv ib qho kev vibrational spectrum raws li kev hloov ntawm ib qho molecule los ntawm lub xeev hauv av mus rau lub xeev zoo siab thib ob.
Cov lus hauv qab no qhia txog qhov sib txawv ntawm Fermi resonance thiab overtones hauv IR spectra.
Summary – Fermi Resonance vs Overtones in IR Spectra
Qhov sib txawv tseem ceeb ntawm Fermi resonance thiab overtones hauv IR spectra yog tias fermi resonance yog kev hloov ntawm lub zog thiab kev siv zog ntawm kev nqus bands hauv IR spectra lossis Raman spectra, whereas overtones hauv IR spectra yog spectral bands uas tshwm sim hauv ib qho. vibrational spectrum raws li kev hloov ntawm ib qho molecule los ntawm lub xeev hauv av mus rau lub xeev siab thib ob.
