PHYS 1750: SELECTED TOPICS in PHYSICS
LECTURE 43. Atomic Spectra

[28].	Stucture of other atoms
	1.	Electric forces and potentials
	2.	Energy levels
	3.	Observed emission spectrum pattern
	4.	Stellar spectra
28.9.	Applications
	1.	Fluorescence.
		a.	Excitation by high energy photon followed by:
		b.	De-excitation emission of two or more lower energy photons.
		c.	Example: UV (blacklight) excitation of fluorescent paints.
		d.	Example: UV excitation of coating in fluorescent lamps.
		e.	The Fluorescent Mineral Society.
	2.	Phosphorescence.
		a.	Excitation by photon absorption.
		b.	De-excitation process slow, so emission lasts after excitation stops.
		c.	Example: glow-in-the-dark stick-on stars, etc.
	3.	Other luminescence.
		a.	Excitation by chemical reaction or electric current.
		b.	Example: glow-necklaces and bracelets at amusement parks.
		c.	Example: fireflies and luminescent plankton.
		d.	Some other kinds and definitions.
	4.	Lasers.

Review Questions
Lecture 44: Nuclear Physics

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