Calculating Kappa from Koehler Theory in R Programming Language
The following script, implemented in the R programming language (http://www.r-project.org/), calculates the hygroscopicity parameter "kappa" for critical supersaturation dry diameter data pairs. This script is modified from Markus Petters’ interactive data language (IDL) script (http://www4.ncsu.edu/~
findkappa.r finds the kappa from a dry diameter and critical supersaturation data pair.
Convert your dry diameter and critical supersaturation data pairs into a file called “input.csv” with headers as specified in the findkappa.r script and the columns being time, dry diameter and critical supersaturation.
Petters, M.D and Kreidenweis, S.M., A single parameter representation of hygroscopic growth and cloud condensation nucleus activity, Atmospheric Chemistry and Physics, 7(8), 1961-1971, 2007.
ATOFMS Database Software: The YAADA Toolkit for Matlab
Single particle mass spectrometry datasets can be vast and highly detailed. Our group uses a toolkit built specially for ATOFMS data by Jonathan O. Allen called YAADA (Yet Another ATOFMS Data Analyzer). Databases are constructed in a series of data tables, which can be searched independently using unique particle identifiers. YAADA is open source and is implemented in the Matlab environment. Find more information at www.yaada.org.