Absorption Spectrum of Bromine

ABSORPTION SPECTRUM AND DISSOCIATION ENERGY OF BROMINE

(Last Revision: January 31, 1997)

ABSTRACT:
The aborption spectrum of bromine is obtained and analyzed to determine the energy of dissociation.
TEXT REFERENCE:
Sime, Rodney J., "Physical Chemistry - Methods, Techniques and Experiments," Saunders Pub., Philadelphia, PA, 1990. p. 660-668.
OTHER REFERENCES:
GENERAL DESCRIPTION AND THEORY:
When the electronic absorption spectrum of a halogen is recorded, the vibrational changes appear superimposed on the spectra. The spacings between the vibrational levels can be obtained and the Birge-Sponer extrapolation used to obtain dissociate energy values. The spectrum of the liquid bromine is easily obtained and with a little warming the spectrum of iodine can also be obtained.
EQUIPMENT:
UV-visible spectrometer, cells.
CHEMICALS:
bromine and/or iodine.
LABORATORY PROCEDURE:
Follow the procedure described by Sime.
CALCULATIONS:
The calculations are those described by Sime.
LITERATURE VALUES: