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Study of hot bands in the <i>B</i> <sup>2</sup> <sup>+</sup> <sub>u</sub> - <i>X</i> <sup>2</sup> <sup>+</sup> <sub>g</sub> system of C <sup>-</sup> <sub>2</sub> anion
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2003
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EngineeringNuclear PhysicsMagnetic ResonanceAbsorption SpectroscopyChemistryThermal RadiationSpectroscopic PropertySpectra-structure CorrelationHot BandsMolecular ConstantsThermodynamicsMolecular SpectroscopyPhysicsAtomic PhysicsPhysical ChemistryQuantum ChemistryMicrowave SpectroscopyNatural SciencesSpectroscopyApplied PhysicsCondensed Matter PhysicsVelocity Modulation Spectroscopy
Optical heterodyne magnetic rotation enhanced velocity modulation spectroscopy was employed to observe the visible absorption spectra of the B2Σ+u-X2Σ+g electronic transition of C-2. Four hot bands (0,1), (1,2), (2,3) and (3,4) have been observed and the band (3,4) is measured directly for the first time, so far as we know, by absorption. A rotational analysis was carried out to obtain molecular constants. With the Franck-Condon principle and the vibrational Boltzmann distribution, we have estimated the vibrational temperature of C-2 to be about 3000K.