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

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Presentation transcript:

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

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

Black body radiation

A tungsten lamp 3000 K

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

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

Filters

thickness Refractive index

A Bunsen monochromator

Detector plate Refractive index of NaCl 350 nm nm nm nm  m  m  m  m  m  m  m 1.44

Quarz prisms Littrow Cornu

Czerney-Turner monochromator

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