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  Home > JCE Print > Journal of Chemical Education > Issues > 1996  > November  >
In the Laboratory
Mass Ratio of the Deuteron and Proton from the Balmer Spectrum of Hydrogen: Variation on an Undergraduate Physical Chemistry Experiment
Lutfur R. Khundkar
Department of Chemistry, Northeastern University, Boston, MA 02115
Cover
November 1996
Vol. 73 No. 11
p. 1055
Abstract
A common experiment in some Physical Chemistry Laboratory courses involves the analysis of the Balmer series of the hydrogen atom to derive the Rydberg constant. We describe a simple modification of this experiment, which involves a comparison of the Balmer spectrum of hydrogen and deuteron atoms to determine their nuclear mass ratio. The accuracy of the experiment relies on a sufficient amount of 1H2 being present along with 2H2 in the deuterium lamp for its use as an internal standard. In our implementation, we use a gear-driven 0.25 m scanning monochromator with a 1200 lines/mm grating. The typical precision of our measured mass ratio is better than 10 %.
More Information
*  Citation
 Khundkar, Lutfur R. J. Chem. Educ. 1996 73 1055.
*  Keywords
 Physical Chemistry
*  History
 Created:
Last Updated:		 August 5, 1999
February 21, 2006
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