Laserspray Ionization (LSI) Ion Mobility Spectrometry (IMS) Mass Spectrometry

A simple device is described for desolvation of highly charged matrix/analyte clusters produced by laser ablation leading to multiply charged ions that are analyzed by ion mobility spectrometry-mass spectrometry. Thus, for example, highly charged ions of ubiquitin and lysozyme are cleanly separated in the gas phase according to size and mass (shape and molecular weight) as well as charge using Tri-Wave ion mobility technology coupled to mass spectrometry. This contribution confirms the mechanistic argument that desolvation is necessary to produce multiply charged matrix-assisted laser desorption/ionization (MALDI) ions and points to how these ions can be routinely formed on any atmospheric pressure mass spectrometer.

Graphical AbstractLaserspray ionization (LSI) has elements of MALDI and ESI. Laser ablation of a MALDI sample in transmission geometry produces charged droplets similar to ESI.Figure optionsDownload high-quality image (139 K)Download as PowerPoint slide