Abstract book - Prof. Per Jensen, Ph.D. - Bergische Universität ...

Poster session, H30 143Experimental and theoretical broadening coefficients of self-perturbedSO 2 ro-vibrational transitions in the 9 µm atmospheric region fromtunable diode laser spectroscopy and semiclassical calculationsNicola Tasinato 1 , Andrea Pietropolli Charmet 1 , Paolo Stoppa 1 , Giovanni Buffa 2Tasinato N.Pietropolli CharmetStoppa P.Buffa G.1 Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca’ Foscari Venezia,Calle Larga S. Marta 2137, I-30123 Venezia, Italy, tasinato@unive.it; 2 INO-CNR andDipartimento di Fisica “E. Fermi”, Università di Pisa, Largo Pontecorvo 3, I-56127 Pisa,Italy, buffa@df.unipi.it.Sulfur dioxide is an important molecule which plays a significant role in many fieldssuch as chemistry, biology and industry. Referring to Earth's atmosphere the naturalsources are biomass burning and volcanic eruptions, 1 nevertheless the main sources ofsulfur dioxide arise from anthropogenic activities. Indeed it is widely used in foodindustry, particularly in wine making and food preserving.For these reasons, in our laboratories we are currently undertaking a systematic studyconcerning the determination of line-by-line parameters, in particular broadeningcoefficients and integrated absorption coefficients, of sulfur dioxide either selfbroadenedor perturbed by a series of foreign perturbers.In this work, line-by-line parameters have been determined experimentally for severalsulfur dioxide ro-vibrational transitions in the ν 1 band region within the 9 µmatmospheric window. The measurements have been carried out at room temperatureemploying a tunable diode laser spectrometer. Self-broadening parameters have alsobeen calculated theoretically adopting a semi-classical formalism based on theAnderson-Tsao-Curnutte approximation. The data obtained for the new transitions hereinvestigated confirms our previous results 2 and allows the dependence of selfbroadeningcoefficients on rotational quantum numbers to be explored. Besides to selfbroadeningcoefficients, the line profile analysis of the recorded spectra has led to thedetermination of the integrated absorption coefficients.References[1] W. G. Mankin, M. T. Coffey and A. Goldman, Geophys. Res. Lett. 19, 179 (1992).[2] N. Tasinato, A. Pietropolli Charmet, P. Stoppa, S. Giorgianni and G. Buffa, J. Chem.Phys. 132, 044315 (2010).