Combination of sorption tube sampling and thermal desorption with hollow waveguide FT-IR spectroscopy for atmospheric trace gas analysis : Determination of atmospheric ethene at the lower b level - Croitoru, Nathan.; Haberhauer-Troyer, Christina.; Inberg, Alexandra.; Melas, Fabiano de.; Mizaikoff, Boris.; Pogodina, Olga A.; Pustogov, Victor V.; Puxbaum, Hans.; Rosenberg, Erwin.