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. J1 - ACP VL - 7 IS - 5 SP - 1333 EP - 1345 Y1 - 2007/02/27 PB - Copernicus Publications SN - 1680-7324 UR - https://acp.copernicus.org/articles/7/1333/2007/ L1 - https://acp.copernicus.org/articles/7/1333/2007/acp-7-1333-2007.pdf DO - 10.5194/acp-7-1333-2007 ER -