Absorptance vs Absorbance
Absorbance thiab absorptance yog ob yam tseem ceeb ntawm cov teeb meem. Cov khoom no tau siv dav hauv cov ntawv thov xws li tshuaj ntsuam xyuas, ob qho tib si ntau thiab zoo, hauv Chemistry. Cov ntawv thov xws li spectrometry, spectrophotometric, thiab IR spectrometry siv cov khoom ntawm absorbance thiab absorptance los ua haujlwm. Nyob rau hauv tsab xov xwm no, peb yuav tham txog dab tsi absorbance thiab absorptance yog, lub ntsiab lus ntawm absorptance thiab absorbance, lawv cov kev siv, zoo sib xws ntawm ob, thiab thaum kawg qhov txawv ntawm absorptance thiab absorbance.
Dab tsi yog Absorptance?
Absorptance txhais tau tias yog qhov piv ntawm cov radiant flux absorbed los ntawm lub cev, rau qhov xwm txheej rau nws. Absorptance yog ib yam khoom, uas txawv nrog lub wavelength ntawm cov electromagnetic tsis siv. Yuav kom nkag siab qhov laj thawj ntawm qhov no, ib tus yuav tsum xub nkag siab txog qhov nqus spectrum. Lub atom muaj ib tug nucleus, uas yog tsim los ntawm protons, neutrons, thiab electrons uas yog orbiting nyob ib ncig ntawm lub nucleus. Lub orbit ntawm lub electron nyob ntawm lub zog ntawm lub electron. Siab dua lub zog ntawm electron deb deb ntawm lub nucleus nws yuav orbit. Siv quantum txoj kev xav nws tuaj yeem pom tau tias cov hluav taws xob tsis tuaj yeem tsuas yog tau txais qib zog xwb. Cov hluav taws xob hluav taws xob muaj peev xwm muaj tsis sib xws. Thaum ib qho piv txwv ntawm atoms muab nrog ib tug nruam spectrum nyob rau hauv ib co cheeb tsam, cov electrons nyob rau hauv lub atoms nqus ib tug npaum li cas ntawm lub zog. Txij li thaum lub zog ntawm electromagnetic yoj kuj quantized, nws muaj peev xwm hais tias cov electrons nqus photons nrog ib tug tshwj xeeb energies. Ntawm qhov spectrum coj tom qab lub teeb dhau los ntawm cov khoom siv, qee lub zog zoo li ploj lawm. Cov zog no yog cov photons uas tau nqus los ntawm cov atoms. Tag nrho absorptance ntawm ib yam khoom yog qhov nqus ntawm tag nrho cov spectrum. Spectral absorptance yog qhov nqus ntawm ib lub wavelength tshwj xeeb. Nws yuav tsum raug sau tseg tias qhov nqus yog ib qho khoom ntawm tag nrho cov khoom. Absorptance nyob ntawm qhov ntev ntawm cov khoom thiab cov concentration ntawm cov khoom.
Dab tsi yog Absorbance?
Absorbance yog txhais tias Log10 (I0/I); qhov twg I0 yog qhov kev siv ntawm qhov teeb meem teeb pom kev zoo, thiab kuv yog qhov kev siv ntawm lub teeb ci uas dhau los ntawm cov qauv. Lub teeb hluav taws xob yog monochromatic thiab teem rau ib lub teeb wavelength. Txoj kev no yog siv rau ntawm spectrophotometers. Lub absorbance nyob ntawm qhov concentration ntawm cov qauv thiab ntev ntawm tus qauv. Lub absorbance ntawm kev daws yog linearly proportional rau qhov concentration, raws li txoj cai Beer - Lambert, yog hais tias tus nqi I0 / kuv nyob ntawm 0.2 thiab 0.7. Qhov no yog ib txoj cai muaj txiaj ntsig zoo hauv spectroscopic txoj kev siv hauv kev txheeb xyuas qhov ntau. Thaum absorbance yog txhais nyob rau hauv lwm yam uas tsis yog chemistry, nws yog txhais raws li Log¬e(I0/I).
Qhov txawv ntawm qhov nqus thiab nqus yog dab tsi?
• Absorbance sib txawv linearly nrog concentration, tab sis absorptance txawv nonlinearly.
• Absorptance yog qhov flux piv ntawm cov khoom, thiab absorbance yog tus nqi log ntawm qhov sib piv.
• Absorptance yog ib qho kev ntsuas ntawm cov flux uas tau nqus, thaum absorbance yog ntsuas ntawm flux uas tau dhau mus.
