Showing papers in "Journal of the Optical Society of America in 1990"
Journal Article•
TL;DR: In this article, a rotational analysis was carried out by means of a simple rigid-rotor harmonic-oscillator model for a linear molecule, and an adequate fit was obtained, showing that all these vibrational levels could be described by a linear average geometry even though the bending vibration is known to be of extremely large amplitude.
Abstract: Stimulated-emission pumping spectra were recorded for many pure bending levels [(0, 2, 0)–(0, 34, 0)] and bend–symmetric-stretch combination levels [(1, 0, 0)–(1, 8, 0) and (3, 4, 0)–(3, 8, 0)] in the X˜1Σg+ state of C3 following excitation of transitions in the A˜1Πu−X˜1Σg+ band system. Rotational levels to J = 16 were probed and, because of strong mixing of vibrational angular momentum components, levels with l up to 8 were observed. A rotational analysis was carried out by means of a simple rigid-rotor harmonic-oscillator model for a linear molecule. An adequate fit was obtained, showing that all these vibrational levels could be described by a linear average geometry even though the bending vibration is known to be of extremely large amplitude. Bυ was found to increase strongly with υ2 and to decrease with excitation in ν1. Interpretation of the physical meaning of the resulting parameters is difficult, however, since the vibrational potential is not well described by a harmonic oscillator.
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