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Using the Asymmetric Stretch Band of Atmospheric CO2 to Obtain the C=O Bond Length
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Abstract
Infrared studies of the vibrational-rotational levels of linear molecules such as HCl are often used to teach principles of spectral interpretation and data analysis. The determination of precise bond lengths is a particularly interesting result of such experiments. The resolution of IR instruments commonly used in the undergraduate laboratory precludes the study of most larger linear molecules. Carbon dioxide is one exception because only even J rotational levels are present in the molecular ground state owing to symmetry requirements, and transitions from the even J levels, separated by 1-2 cm-1, are sufficiently resolved for analysis by many FTIR instruments. This illustration of a symmetry effect makes CO2 a useful additional example for educational purposes, and normal air has enough CO2 to provide good spectra. The analysis of the asymmetric stretch band is presented with results for the rC=O bond length. The supplemental material presents further discussion of alternative data analysis options, the possible impact of 13CO2, and analysis spreadsheets.
Keywords (Audience):
Upper-Division UndergraduateKeywords (Domain):
Physical ChemistryKeywords (Subject):
IR SpectroscopyCiting Articles
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This article has been cited by 5 ACS Journal articles (5 most recent appear below).
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Kieran F. LimJournal of Chemical Education2005 82 (1), 145Undergraduate students often have the misconception that molecules have fixed, unchanging bond lengths. This article discusses how linear-molecule rotational band spacings in infrared spectroscopy can be used as a qualitative, visual demonstration of the ...
Use of Molecular Symmetry To Describe Pauli Principle Effects on the Vibration–Rotation Spectroscopy of CO2(g)
M. L. Myrick , P. E. Colavita , A. E. Greer , B. Long and D. AndreattaJournal of Chemical Education2004 81 (3), 379Use of Molecular Symmetry To Describe Pauli Principle Effects on the Vibration–Rotation Spectroscopy of CO2(g)
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- Received: August 03, 2009
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