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

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Chem 155 Unit 10 Page 177 <strong>of</strong> 316Ultraviolet-Visible and Near Infrared AbsorptionResponsibilities in the Chapter 13Measurement <strong>of</strong> Transmittance / Absorbance (13A)Beer’s Law (13B)Mixtures (13B-1)Limitations (13B-2)Effect <strong>of</strong> <strong>Ins</strong>trumental Noise on SpectrophotometricAnalysis (13C)<strong>Ins</strong>trumentation (13D, 13D-1, 13D-2)OverviewUltravioletVisibleNear Infrared190-400 nm400-750 nm750-2500 nmWe group these wavelengths together for tworeasons.Analytes:This wavelength range covers many atomicand molecular electronic absorptions.Optics:Pure SiO 2 , called fused silica or quartz istransparent in this range. Even airabsorbs strongly at λ

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