1. Department of Chemistry, Organic Chemistry, Umeå University, SE-901 87 Umeå, Sweden, Energy Technology and Thermal Process Chemistry, Umeå University, SE-901 87 Umeå, Sweden, Department of Physics, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway, and Division of Sensor Technology, Swedish Defence Research Agency (FOI), SE-581 11 Linköping, Sweden