High resolution CARS spectrum and analysis of the v₁ band Q-branch of carbon dioxide

Abstract

High resolution coherent anti-Stokes Raman spectroscopy (CARS) has been applied to the study of the Q-branch of the fundamental vibrational v ₁ band of CO₂ in the Fermi resonance region near 1285·5 cm^-1. Thanks to the use of high spectral quality (linewidth = 6 MHz) injection-locked flashlamp-pumped dye lasers, it was possible to resolve this band for the first time. The spectrum was recorded at a pressure of 5 kPa (37·5 Torr) at room temperature. We measured the line positions and collisional widths for the transitions with J values from 8 to 38. Our experimental line positions are in excellent agreement with those derived from molecular constants given on the literature. The observed linewidths agree for most of the lines within 5 per cent with the values calculated from a recently developed model.

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Notes on contributors

H.W. Schrötter

On leave from: Laboratoire de Spectronomie Physique appliquée, Faculté des Sciences, Université de Rabat, Maroc. On leave from: Sektion Physik der LMU, Munchen, F.R. Germany.