Bond length dependence on quantum states as shown by spectroscopy
Data(s) |
01/01/2005
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Resumo |
Undergraduate 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 elongation of average bond lengths on vibrational excitation. The method does not depend on a detailed mathematical analysis of the spectra. In UV–vis spectroscopy, the rotational band spacings give rise to distinctive linear-molecule rotational contours, which easily show whether the average bond length has increased or decreased. The method is based on a spreadsheet simulation of the vibration–rotation or rovibronic (electronic–vibration–rotation) spectrum and is applied to hydrogen chloride IR, iodine UV–vis, and nitrogen UV–vis spectra in this article. |
Identificador | |
Idioma(s) |
eng |
Publicador |
Division of Chemical Education, American Chemical Society |
Relação |
http://dro.deakin.edu.au/eserv/DU:30003170/n20050954.pdf http://jchemed.chem.wisc.edu/Journal/Issues/2005/Jan/PlusSub/V82N01/p145.pdf |
Direitos |
2005, Division of Chemical Education, American Chemical Society |
Tipo |
Journal Article |