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Complex Spectra

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Looks at the spectra of zinc, sodium, mercury, hydrogen and deuterium. For all of the gases, the wavelengths of the lines in the spectra are measured and compared to the expected values. For the zinc spectra, the separations of the zinc triplet are measured and checked to see if they are in the ratio of 2:1 as expected with L-S coupling. The coupling constant (both magnitude and sign) for zinc is also measured. For the sodium spectrum, similar activities are done. The resolving power of the of the grating is also measured and the result compared to the resolving limit set by the wave nature of light.

Course Level

Introductory: P17, P23, P24

Student Handouts


Number of set-ups available: 5

Per lab station:

1 spectrometer
1 cross hairs illuminator
1 diffraction grating
1 flashlight
1 Handbook of Chemistry and Phyics
1 platform for spectrometer
1 lamp

Per class:

1 sodium arc lamp
2 mercury lamps
2 zinc lamps

Charges apparatus


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Site contact: largent@Dartmouth.EDU

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