lecture 7 light sources, filters, and monochromators harris ch.20
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![Page 1: Lecture 7 Light sources, filters, and monochromators Harris Ch.20](https://reader034.vdocuments.net/reader034/viewer/2022042702/56649d615503460f94a43257/html5/thumbnails/1.jpg)
Lecture 7
Light sources, filters, and
monochromators
Harris Ch.20
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Light Source
Sample
Monochromator(filter,
wavelength selector)
Detector
SpectrometerData Processing
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Black body radiation
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A tungsten lamp
3000 K
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Deuterium Lamp
hHHHEH '''202
Deuterium: higher intensity
Even higher intensity: Xe arc
UV sources
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Light Source
Sample
Monochromator(filter,
wavelength selector)
Detector
SpectrometerData Processing
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Filters
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nl 2maxthickness
Refractive index
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A Bunsen monochromator
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Detector plate
Refractive index of NaCl350 nm 1.58460 nm 1.56 680 nm 1.54 1250 nm 1.53
7.30m 1.51 10.6m 1.49 12.0m 1.48 13.1m 1.47 14.2m 1.46 15.1m 1.45 16.0m 1.44
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Quarz prisms
LittrowCornu
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Czerney-Turner monochromator
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)sin(sin dn
nN
Diffraction order
Number of grooves
cosd
n
d
d
Dispersion:Resolution (resolving power):
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