Stimulated Emission Pumping Spectroscopy of Jet-Cooled C3: Pure Bending Levels and Bend - Symmetric Stretch Combination Levels of X1Σ+g

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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 Ã1IIu−X˜1Σg+ 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. Bv was found to increase strongly with v2 and to decrease with excitation in v1. Interpretation of the physical meaning of the resulting parameters is difficult, however, since the vibrational potential is not well described by a harmonic oscillator. © 1990 Optical Society of America
Original languageEnglish
Pages (from-to)1924-1934
JournalJournal of the Optical Society of America
Volume7
StatePublished - 1990

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