FIU CHM 4130 - CHAPTER 7A_Xiao_Components_of_Optical_Instruments_2018 (1) (58 pages)

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CHAPTER 7A_Xiao_Components_of_Optical_Instruments_2018 (1)



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Topics You Know By Now From Physics From Chemistry EM radiation and its Photoelectric effect properties Electromagnetic Diffraction spectrum Refraction Beer s Law etc Reflection Quantized states in Coherent and atoms incoherent radiation lead to line spectra Polarization of radiation Quantized states in molecules Scattering of radiation lead to broad or continuum spectra Components of Optical Instruments Chapter 7 2 Components of Optical Instruments The generic spectrometer n Sources n Sample Holders n Wavelength Separators and Slits n Detectors n Signal processor and readout Components of Optical Instruments The generic spectrometer n Sources n Sample Holders n Wavelength Separators and Slits n Detectors n Signal processor and readout Absorption measurements Fluorescence Phosphorescence measurements Emission Chemiluminescence measurements 5 Generated beam with sufficient stable radiant power 6 Spectroscopic Sources Al Mg Continuum Source Line Source Continuum Line Source Ingle and Crouch Spectrochemical Analysis 7 Application Continuum sources absorption and fluorescence spectroscopy Line sources atomic absorption spectroscopy atomic and molecular fluorescence spectroscopy Raman spectroscopy Laser sources Raman spectroscopy molecular absorption spectroscopy emission spectroscopy as part of instruments for Fourier transform infrared spectroscopy 8 Optical Continuum Source Characteristics Ingle and Crouch Spectrochemical Analysis 9 Tungsten Filament Heated to 2870 K Useful Range 350 2500nm 10 Tungsten Halogen Iodine added Reacts with gaseous W near the quartz wall to form WI2 W is redeposited on the filament Smooth spectral curve stable output and little UV radiation Gives longer lifetimes Allows higher temperatures 3500 K 11 Intensity Spectrum of the Tungsten Halogen Lamp Weak intensity in UV range Good intensity in visible range Very low noise Low drift 12 Deuterium D2 Lamps Discharge of excited deuterium gas Continuum of UV light 185 400 nm Ultraviolet source for



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