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]
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]
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]
Street Lamp Spectra
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Projected emission spectra from large sodium and mercury lamps using elliptic reflectors.
[In-Depth Description]
Collisional Broadening
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Na D-doublet absorption lines broaden into one large absorption band due to increase in pressure/temperature.
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]
Periodic Potential
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Balls in a frame simulating the repeating potential wells of a lattice.
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