Temporal and spectral characteristics of atmospheric pressure argon plasma jet Jüri Raud, Indrek Jõgi, Matti Laan and Marti Laast Eur. Phys. J. Appl. Phys., 61 2 (2013) 24326 Published online: 15 February 2013 DOI: 10.1051/epjap/2013120432