PDMS, the 'Plasma' Desorption Mass Spectrometry, is a method to desorb even very large and fragile organic molecules up to some 10000 amu by means of very fast, energetic ( MeV/nucleon ) heavy ions impinging a solid surface with sample molecules adsorbed on it. A brief sketch of the underlying physics of the process is given. Several programmes to analyze, calculate, and transfer PDMS spectra are described in detail.