Full set of Notes with Fill-Ins - San Jose State University

Chem. 155 Unit 4 Page 90 of 316Optical SourcesCostTrade Off$$ VUV Only?$$ Short Lifetimes$$ Popular UV-source – usedwith W-Halogen for UV-Vis$ W-HalogenVisible only, long lifetimes$$ NIR and IR Only$ IR only$ IR Only$$ Low intensity, limited λ’s$$- $$$$ Exellent Intensity, limitedλ’s$ - $$ very high resolution, poordynamic range$$-$$$ PMT v. fast, v.v. sensitive,delicate, limited in IR$-$$ low sensitvity, limited in IRbut cheap$ - $$$ sensitive and fast, muchtougher than PMT$$-$$$$ v. sensitive, slow, tough,$$-$$$ detector of choice most IRMore exotic ‘energy detectors’ – don’tknow much about thesePage 90 of 316