Mass Spectrometry Letters, MSL, publishes brief letters and technical notes, maximum length of 4 pages, on fundamental research and applications in all areas of mass spectrometry. Topical sections of the journal are diverse, covering ion chemistry in a broad sense; gas-phase thermodynamics or kinetics; theory and calculations related with mass spectrometry or ions in vacuum; ion- optics; analytical aspects of mass spectrometry; instrumentations; methodology developments; ionization methods; proteomics and its related research; metabolomics and its related research; bioinformatics; software developments; database development; biological research using mass spectrometry; pharmaceutical research by mass spectrometry; food sciences using mass spectrometry; forensic results using mass spectrometry; environmental mass spectrometry; inorganic mass spectrometry; chromatography-mass spectrometry; tandem mass spectrometry; small molecule research using mass spectrometry; TOF- SIMS, etc. The scope of the journal is not limited to the above-mentioned areas, but includes ever-expanding areas related directly or indirectly to mass spectrometry.