O'Rourke, Matthew B The Effect of Collimating Lens Focusing on Laser Beam Shape in Matrix Assisted Laser Desorption/Ionization Mass Spectrometry (MALDI-MS). [electronic resource] - Journal of the American Society for Mass Spectrometry 03 2018 - 512-515 p. digital Publication Type: Journal Article ISSN: 1879-1123 Standard No.: 10.1007/s13361-017-1867-9 doi