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Observation and Analysis of N2O Rotation–Vibration Spectra

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Mark S. Bryant , Scott W. Reeve and William A. Burns

Department of Chemistry and Physics, Arkansas State University, State University, AR 72467

J. Chem. Educ., 2008, 85 (1), p 121

DOI: 10.1021/ed085p121

Publication Date (Web): January 1, 2008

Section:

History, Education, and Documentation

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 cm^â’1 resolution teaching grade FTIR spectrometer, 15 vibrational bands, corresponding to 1229 rotation–vibration transitions, have been observed in the region 5000–500 cm^â’1. 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.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Laboratory Instruction

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Gases

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