title: Field ionization mass spectrometry. I--Field desorption spectra of nucleotides--experimental problems.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D013058:Mass Spectrometry / Q000295:instrumentation / Q000379:methods; D008670:Metals; D009711:Nucleotides / Q000032:analysis*; D013696:Temperature
chemical_list: D008670:Metals; D009711:Nucleotides