title: A combined field ionisation-electron impact ion source for high molecular weight samples of low volatility.
mesh_terms: D000438:Alcohols; D002301:Cardiac Glycosides; D002623:Chemistry Techniques, Analytical / Q000295:instrumentation*; D004583:Electrons; D007477:Ions; D008970:Molecular Weight; D009020:Morphine; D011874:Radiometry / Q000295:instrumentation*; D012266:Ribose; D013057:Spectrum Analysis
chemical_list: D000438:Alcohols; D002301:Cardiac Glycosides; D007477:Ions; D012266:Ribose; D009020:Morphine