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  Home > JCE Print > Journal of Chemical Education > Issues > 2008  > January  >
In the Laboratory
Observation and Analysis of N2O Rotation–Vibration Spectra
A Physical Chemistry Laboratory Experiment
Mark S. Bryant, Scott W. Reeve, and William A. Burns
Department of Chemistry and Physics, Arkansas State University, State University, AR 72467
Cover
January 2008
Vol. 85 No. 1
p. 121
Abstract
The linear molecule N2O is presented as an alternative gas-phase species for the ubiquitous undergraduate physical chemistry rotation–vibration spectroscopy experiment. Utilizing a 0.5 cm1 resolution teaching grade FTIR spectrometer, 15 vibrational bands, corresponding to 1229 rotation–vibration transitions, have been observed in the region 5000–500 cm1. The large quantity of observed data presents the opportunity to assign each of 15 students, or groups, a unique band to analyze independently. The data analysis of each band is straightforward, involving P- and R- branch transition-energy expressions similar to those used in the analysis of traditional diatomic molecules such as HCl and CO, and result in the determination of a band origin and B rotational constants. Spectroscopic constants of independent band analyses can be pooled to determine anharmonicity and vibration–rotation constants and prepare a vibrational energy-level diagram involving the 15 observed states.
Supplement
Directions for the students and notes for the instructors including the tables containing the observed rotation–vibration transitions are available.
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Contents
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More Information
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Citation
Bryant, Mark S.; Reeve, Scott W.; Burns, William A. J. Chem. Educ. 2008, 85, 121.
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Keywords
Gases; Hands-On Learning / Manipulatives; Inquiry-Based / Discovery Learning; IR Spectroscopy; Laboratory Instruction; Physical Chemistry; Quantum Chemistry; Upper-Division Undergraduate
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History
Created:
Last Updated:
12/4/2007
12/12/2007
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