Qhov sib txawv tseem ceeb ntawm photoionization thiab photoelectric emission yog tias photoionization yog hais txog kev sib cuam tshuam ntawm electromagnetic hluav taws xob nrog teeb meem, uas ua rau dissociation ntawm cov teeb meem no rau hauv hluav taws xob hais, whereas photoelectric effect yog ib hom photoionization qhov twg ejection ntawm electrons. tshwm sim thaum lub teeb ci rau ntawm qhov chaw ntawm cov khoom siv.
Photoionization yog txheej txheem lub cev uas cov ion tsim los ntawm cov tshuaj tiv thaiv ntawm photon thiab atom lossis molecule. Cov nyhuv photoelectric yog cov txheej txheem ntawm emission ntawm electrons thaum electromagnetic tawg hits ib yam khoom.
Photoionization yog dab tsi?
Photoionization yog txheej txheem lub cev uas cov ion tsim los ntawm cov tshuaj tiv thaiv ntawm photon thiab atom lossis molecule. Txawm li cas los xij, peb tsis tuaj yeem categorize tag nrho cov kev sib cuam tshuam ntawm photons thiab atoms lossis molecules li photoionization vim qee qhov kev sib cuam tshuam tsim cov hom tsis-ionized; Yog li ntawd, peb yuav tsum muaj kev cuam tshuam kev cuam tshuam rau lub photoionization cross-section ntawm cov tshuaj hom. Ntxiv mus, qhov no photoionization hla ntu yog nyob ntawm lub zog ntawm photon thiab cov khoom ntawm cov tshuaj lom neeg uas tab tom ua haujlwm.
Daim duab 01: Photoionization hauv Chaw
Multi-photon ionization yog ib hom photoionization uas ob peb photons muab lawv lub zog rau ionize ib atom lossis ib lub molecule. Ntawm no, lub zog ntawm photons yuav tsum qis dua qhov pib ntawm ionization zog.
Ntxiv rau hom saum toj no, qhov ionization yog lwm hom kev siv hluav taws xob photoionization qhov twg lub laser siv rau cov txheej txheem photoionization tau nce, lossis siv lub wavelength ntev dua, tso cai rau ntau cov duab ionization tshwm sim. Qhov tshwm sim ntawm cov txheej txheem no yog qhov cuam tshuam ntawm lub peev xwm atomic nyob rau hauv ib txoj kev uas tsuas yog ib qho qis thiab nqaim barrier ntawm lub xeev khi thiab lub xeev txuas ntxiv. Ntawm no, cov khoom siv hluav taws xob tuaj yeem dhau los ntawm kev thaiv. Cov no yog hu ua tunnel ionization thiab hla qhov barrier ionization, feem.
Photoelectric Emission yog dab tsi?
Cov nyhuv photoelectric yog qhov emission ntawm electrons thaum electromagnetic tawg hits ib yam khoom. Electromagnetic hluav taws xob feem ntau yog lub teeb. Cov electrons uas tawm ntawm qhov chaw no hu ua photoelectrons. Peb tuaj yeem kawm qhov tshwm sim no hauv condensed teeb meem physics thiab solid-state thiab quantum chemistry, thiab. Nws yog ib qho tseem ceeb kom kos cov kev cuam tshuam txog cov khoom ntawm atoms, molecules, thiab solids.
Daim duab 02: Photoelectric Effect
Photoelectric emission muaj txiaj ntsig zoo hauv cov khoom siv hluav taws xob uas tshwj xeeb rau kev tshawb pom lub teeb thiab lub sijhawm ua kom muaj hluav taws xob hluav taws xob. Feem ntau, qhov emission ntawm conduction electrons los ntawm cov hlau raug yuav tsum tau ob peb electron Volt teeb quanta. Qhov no yuav tsum tau coj mus rau qhov luv-yoj wavelength pom lossis UV teeb. Tab sis qee zaum, emissions raug ntxias nrog photons, uas yog zero zog, zoo ib yam li cov tshuab muaj qhov tsis zoo electron affinity thiab emissions los ntawm cov xeev zoo siab.
Qhov txawv ntawm Photoionization thiab Photoelectric Emission yog dab tsi?
Photoionization yog txheej txheem lub cev uas cov ion tsim los ntawm cov tshuaj tiv thaiv ntawm photon thiab atom lossis molecule. Cov nyhuv photoelectric yog cov txheej txheem ntawm emission ntawm electrons thaum electromagnetic tawg hits ib yam khoom. Qhov sib txawv tseem ceeb ntawm photoionization thiab photoelectric emission yog tias photoionization yog hais txog kev cuam tshuam ntawm electromagnetic hluav taws xob nrog cov teeb meem, uas ua rau dissociation ntawm cov teeb meem ntawd rau hauv cov khoom siv hluav taws xob, hos cov nyhuv photoelectric yog hom photoionization qhov twg ejection ntawm electrons tshwm sim thaum lub teeb ci. ntawm ib qho khoom siv.
Cov lus hauv qab no qhia txog qhov sib txawv ntawm photoionization thiab photoelectric emission.
Summary – Photoionization vs Photoelectric Emission
Cov nyhuv photoelectric yog hom yooj yim tshaj plaws ntawm photoionization. Qhov sib txawv tseem ceeb ntawm photoionization thiab photoelectric emission yog tias photoionization yog hais txog kev cuam tshuam ntawm electromagnetic hluav taws xob nrog cov teeb meem, uas ua rau dissociation ntawm cov teeb meem ntawd rau hauv cov khoom siv hluav taws xob, hos cov nyhuv photoelectric yog hom photoionization qhov twg ejection ntawm electrons tshwm sim thaum lub teeb ci. nyob rau saum npoo ntawm cov khoom.
