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Lecture 7 Light sources, filters, and monochromators Harris Ch.20.

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Presentation on theme: "Lecture 7 Light sources, filters, and monochromators Harris Ch.20."— Presentation transcript:

1 Lecture 7 Light sources, filters, and monochromators Harris Ch.20

2 Light Source Sample Monochromator (filter, wavelength selector) Detector Spectrometer Data Processing

3 Black body radiation

4 A tungsten lamp 3000 K

5 Deuterium Lamp Deuterium: higher intensity Even higher intensity: Xe arc UV sources

6 Light Source Sample Monochromator (filter, wavelength selector) Detector Spectrometer Data Processing

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8 Filters

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10 thickness Refractive index

11 A Bunsen monochromator

12 Detector plate Refractive index of NaCl 350 nm 1.58 460 nm 1.56 680 nm 1.54 1250 nm 1.53 7.30  m 1.51 10.6  m 1.49 12.0  m 1.48 13.1  m 1.47 14.2  m 1.46 15.1  m 1.45 16.0  m 1.44

13 Quarz prisms Littrow Cornu

14 Czerney-Turner monochromator

15 Diffraction order Number of grooves Dispersion: Resolution (resolving power):

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