The Balmer Spectrum of Hydrogen: An Old Experiment with a New Twist

B. R. Ramachandran and Arthur M. Halpern
Indiana State University, Department of Chemistry, Terre Haute, IN 47809
J. Chem. Educ., 1999, 76 (9), p 1266
DOI: 10.1021/ed076p1266
Publication Date (Web): September 1, 1999

Abstract

This paper describes a novel twist to the undergraduate experiment in which students study the UV-visible emission produced from a deuterium discharge tube. In this approach, students do not have to make any assumptions about the nature of the emission lines in order to analyze the spectrum; they first perform a three-parameter nonlinear regression and discover that the emission belongs to the Balmer series and that the 656 nm line is the a line. Subsequently they perform a one-parameter nonlinear regression to obtain the value of the Rydberg constant.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Laboratory Instruction

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Atomic Properties / Structure

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  • Received: August 03, 2009

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