Observation of the v2band of CO+2by diode laser absorption

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Abstract
Four vibronic components of the (v 1 v 2 v 3) = (010) ← (000) fundamental of the CO+ 2 molecular ion in its ground 2Π i state have been detected by diode laser absorption spectroscopy. The ions were formed in a large hollow cathode discharge containing a mixture of helium and a few percent CO2 and maintained at a temperature of approximately 200 K. The spectra are analysed and fitted together with a set of combination differences extracted from the electronic emission spectrum of the ion [1979, Can. J. Phys., 57, 1634] in order to determine parameters describing the rotational and electronic fine structure of all of the vibronic levels associated with v 2 = 0 and 1. The vibronic spacings derived from this analysis are then interpreted in terms of a simple harmonic and a more detailed anharmonic vibronic coupling model to derive information on the bending potential function in the molecule.

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