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UP: Fachverband Umweltphysik

UP 2: Atmosphäre

UP 2.21: Vortrag

Mittwoch, 25. März 2015, 16:15–16:30, G/gHS

FTIR based measurements of the self-broadening and shift coefficients of the first overtone band of HCl — •Gang Li¹, Anton Serdyukov¹, Olav Werhahn¹, and Volker Ebert^1,2 — ¹Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany — ²Center of Smart Interfaces, TU Darmstadt,Petersenstrsße 32, Darmstadt 64287, Germany

FTIR spectra of the 2-0 band of HCl molecule have been measured in the 5300-5900 cm-1 spectral region at 15 different pressures (0.05 - 2.5 bar) and a spectral resolution of 0.07 cm-1. For the first time, reliable self-induced broadening and shift coefficients for the complete HCl 2-0 band have been reported. Line intensities determined from a robust regression analysis with improved uncertainties are also presented. Compared to our previous laser-based measurement for the R3 line {Ortwein et al., Applied Physics B: Lasers & Optics, 100:341-7 (2010)}, our newly measured γ_self coefficient and line intensity are 1.35% and 0.24% larger, respectively. Furthermore, a test on the Hartmann & Boulet theory {Hartmann & Boulet, JCP 133, 9000 (2000)} on the self-induced shifts suggest a breakdown of the theory in the HCl-HCl collisional system.