Experimental investigations of the ozone zero phenomenon K. Murayama, N. Matsumura, M. Taguchi, Y. Katoh, K. Teranishi, S. Suzuki and H. Itoh Eur. Phys. J. Appl. Phys., 47 2 (2009) 22814 Published online: 28 April 2009 DOI: 10.1051/epjap/2009075