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Experimental Measurement of Weak Band Intensities

Published online by Cambridge University Press:  12 April 2016

Kevin K. Lehmann  and
Daniele Romanini
Kevin K. Lehmann
Affiliation:
Department of Chemistry, Princeton University, Princeton NJ 08544, USA
Daniele Romanini
Affiliation:
Department of Chemistry, Princeton University, Princeton NJ 08544, USA

Extract

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In modeling the opacity of astronomical objects, such as stellar atmospheres, the most important transitions are those with absorbance = αL ∼ 1, where α is the absorption coefficient of the atmosphere and L is the pathlength that light travels in leaving the atmosphere. Transitions with much smaller absorbance are not important, while those with much larger absorbance are effectively opaque. The relevant absorption lengths L are typically orders of magnitude larger than can be realized in the laboratory, and thus obtaining the needed laboratory data is a significant experimental challenge. This volume contains several examples of the power of modern ab initio methods to predict spectra of simple triatomic molecules, such as H2O, but it is still necessary to at least calibrate the predictions against laboratory bands of similar oscillator strength. The theoretical treatment of molecules with four or more atoms lags far behind the theoretical treatment of triatomics and present experimental capabilities.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 146: Molecules in the Stellar Environment , 1994 , pp. 366 - 375
Copyright
Copyright © Springer-Verlag 1994

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