TY - JOUR A1 - Laakso, L. A1 - Gagné, S. A1 - Petäjä, T. A1 - Hirsikko, A. A1 - Aalto, P. P. A1 - Kulmala, M. A1 - Kerminen, V.-M. T1 - Detecting charging state of ultra-fine particles: instrumental development and ambient measurements JO - Atmos. Chem. Phys. Discuss. J1 - ACPD VL - 6 IS - 4 SP - 6401 EP - 6429 Y1 - 2006/07/13 PB - Copernicus Publications SN - 1680-7367 UR - http://www.atmos-chem-phys-discuss.net/6/6401/2006/ L1 - http://www.atmos-chem-phys-discuss.net/6/6401/2006/acpd-6-6401-2006.pdf ER -