7B Atomic Physics – Physics Demos

- 7B10. Spectra
  - 7B10.10 Line Sources And Spectrum Grating Observe the emission spectra from different spectral tubes through a holographic grating.
  - 7B10.11 Flame Salts Various salts are held above a Bunsen burner and set aflame. Emission spectra is observed through a holographic grating.
  - 7B10.20 Project Spectral Lines Project high intensity Na and Hg lamps through 1000 lines/mm gratings.
  - 7B10.50 X-ray Line Spectra Model Drop small steel balls on an overturned cake tin to illustrate continuous spectrum and superposed line spectrum.
- 7B11. Absorption
  - 7B11.24 Sodium Absorption Spectra White light is passed through sodium vapor made by spraying sodium solution over a Bunsen burner before being dispersed by a prism.
  - 7B11.30 Mercury Vapor Shadow A UV lamp shines on a zinc sulfide screen while mercury vapors waft from a heated watchglass. Not advisable to do mercury vapor in a classroom!
  - 7B11.40 Filtered Spectrum Part of a beam of white light is projected through a prism. When a filter is inserted in the beam, the spectrum and transmitted light are compared.
  - 7B11.72 Band Absorption Spectrum Antifreeze (ethylene glycol) in a beaker will produce an absorption band when placed in the beam of white light before dispersion by a holographic grating.
  - 7B11.85 “Vanish” Absorption Shine a He-Ne laser and a solid state laser emitting at 670 nm through a solution of Vanish. The He-Ne laser light will be completely absorbed while the solid state laser light will pass through.
- 7B13. Resonance Radiation
  - 7B13.42 Projected Mercury Spectrum The weak lines of the projected mercury spectrum are made visible by painting half of a card with fluorescent paint.
  - 7B13.44 Ultraviolet Lines Use cloth or stationary treated with laundry detergents or dyes that fluoresce and show the ultraviolet lines of a mercury light source.
  - 7B13.50 Fluorescence Use a black light to illuminate fluorescent materials.
  - 7B13.55 Luminescence Luminescent paper and UV beads exhibit luminescence when exposed to black light.
- 7B20. Fine Splitting
  - 7B20.10 Zeeman Splitting With Mecury A mercury lamp between the poles of a large electromagnet is focused on a Fabry-Perot interferometer.
- 7B30. Ionization Potential
- 7B35. Electron Properties
  - 7B35.10 Discharge at Low Pressure The pressure is reduced in a long tube while high voltage from an induction coil is applied to the electrodes.
  - 7B35.40 Maltese Cross Show the shadow of a Maltese cross in an electron discharge tube.
  - 7B35.75 Plasma Globe Commercial Plasma Globe

7B50. Atomic Models
- 7B50.12 (Local) Spherical Harmonic Balls Props used to show the different modes.
- 7B50.50 Periodic Charts Periodic table charts are available.