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Schematic of IR-MALDESI source. The sample is placed on a Peltier cooled X-Y translational stage where an exogenous ice matrix layer may be formed. A 2.94 μm laser is used to desorb material from the sample. The desorption plume interacts with an orthogonal electrospray plume where analytes partition into the charged droplets and ionization occurs in an ESI-like manner.
