#  Atomic and Molecular Physics 

 



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### Atomic and Molecular Crystal Models

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Wooden, plastic, and styrofoam models for show-n-tell. (See also Wooden Orbital Models)

### Flame Tests

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Salts of various elements give off characteristic colors when burned in a flame; diffraction grating reveals discreet colors.

### Electrical Discharges in Air

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The electrical characteristics of a column of air are observed as a function of pressure.

### Tower of Spectra

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Assembly of three gas discharge tubes and white light source for spectral analysis with diffraction gratings.  
  
\[[In-Depth Description](/presentations/tower-spectra)\]

### Resonance Radiation/Absorption

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Heated sodium vapor is transparent when illuminated by white light and opaque when illuminated by light from a sodium lamp.  
  
\[[In-Depth Description](/presentations/resonance-radiation-absorption)\]

### Fraunhofer Absorption

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Sodium "D" absorption lines are observed when sodium is burned in the optical path of a white light spectrum.  
  
\[[In-Depth Description](/presentations/fraunhofer-absorption)\]

### Street Lamp Spectra

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Projected emission spectra from large sodium and mercury lamps using elliptic reflectors.   
  
\[[In-Depth Description](/presentations/street-lamp-spectra)\]

### Collisional Broadening

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Na D-doublet absorption lines broaden into one large absorption band due to increase in pressure/temperature.

\[[In-Depth Description](/presentations/collisional-broadening)\]

### Crookes Tube Flourescent Minerals

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Five minerals in a Crookes tube flouresce bright red, green, blue, yellow, and orange when bombarded with energetic electrons.

### Fluorescent Minerals

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Three mineral samples (sealed in a vacuum flask) glow red, green, and blue when bombarded by electrons.   
  
\[[In-Depth Description](/presentations/fluorescent-minerals)\]

### Periodic Potential

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Balls in a frame simulating the repeating potential wells of a lattice.

\[[In-Depth Description](/presentations/periodic-potential)\]

### Field Emission Electron Microscope

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The crystalline structure of a tungsten filament is revealed by electron field emission.

### Mass Spectrometry

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A model in which a magnetic field is used to separate steel ball bearings by mass.

### Contact Us

**Mailing Address**: Lecture Demonstration Services, Science Center, Rm B-08A, 1 Oxford Street, Cambridge, MA 02138  
**Campus Location**: Science Center B-08A | **Tel**: (617) 495-5824 | **Email**: scidemos-at-fas.harvard.edu