Absolute intensity measurement of the 4-0 vibration-rotation band of carbon monoxide

Computer Science

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Carbon Monoxide, Molecular Rotation, Molecular Spectra, Spectral Line Width, Vibrational Spectra, Abundance, Late Stars, Schroedinger Equation, Stellar Spectra

Scientific paper

The absolute intensity of the 4-0 vibration band of CO is measured in spectra obtained using a 25-m base-path multiple-traversal absorption cell and a 5-m scanning spectrometer. The intensities of individual vibration-rotation lines in this band are determined from measurements of their equivalent widths, and absolute values for the rotationless transition moment and the vibration-rotation interaction factor are derived from the measured line strengths. The experimentally obtained vibration-rotation function is compared with a theoretical curve; agreement between theory and experiment is found to be good for the P-branch but poor for the R-branch. It is noted that numerical solutions to the radial Schroedinger equation lead to vibration-rotation function values that are in good agreement with the experiment.

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