7
Hydrogen Lines
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•Energy absorbed/emitted depends on upper and lower levels
•Higher energy levels are close together
•Above a certain energy, electron can escape  (ionization)
•Series of lines named for bottom level
–To get absorption, lower level must be occupied
•Depends upon temperature of atoms
–To get emission, upper level must be occupied
•Can get down-ward cascade through many levels
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From our text:  Horizons, by Seeds
n=1
n=2
n=3