Raw data used in the article \\"Molecular scale evidence of new particle formation via sequential addition of HIO3\\", Sipilä et al. Nature 2016 CI-APi-TOF Raw data files from 28th of August 2013 to 1st of October 2013 measured with Chemical ionization atmospheric pressure interface time of flight mass spectrometer. Measured at Mace Head Atmospheric Research Station (53°19'34\\"N,9°54'14\\"W). The raw data is in HDF5-files, which can be opened and preprocessed with tofTools MATLAB-program. More information about tofTools: Junninen,H., Ehn, M., Petäjä, T., Luosujärvi, L., Kotiaho, T., Kostiainen, R., Rohner, U., Gonin, M., Fuhrer, K., Kulmala, M., and Worsnop, D. R.: A high-resolution mass spectrometer to measure atmospheric ion composition, Atmos. Meas. Tech., 3, 1039-1053, doi:10.5194/amt-3-1039-2010, 2010. NAIS Raw data files from 4th of September 2013 until 30th of September 2013 measured with Neutral cluster and air ion spectrometer. Measured at Mace Head Atmospheric Research Station (53°19'34\\"N,9°54'14\\"W). The raw data is in text-files. Information about the data preprocessing: Manninen, H. E., Mirme, S., Mirme, A., Petäjä, T., and Kulmala, M.: How to reliably detect molecular clusters and nucleation mode particles with Neutral cluster and Air Ion Spectrometer (NAIS),Atmos. Meas. Tech. Discuss., doi:10.5194/amt-2016-25, in review, 2016.

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