Abstract
We present an overview of IR laser resonant desorption (LRD) studies with specialfocus on recent developments by our group. The resonant character of the laserdesorption process mediated by O–H, C–H, and N–H vibrational modes in the3 µm spectral range has been investigated on ice, PAH and ammonia samples, respectively.The desorption of cryogenic binary mixtures is also presented. An interestingwavelength-selective effect has been found by comparative IR/visible or IR/IR irradiationstudies. At higher fluences and/or analyte concentration values a loss of selectivity occurs,with extensive co-desorption of both components and clustering phenomena. Insights onthe desorption mechanisms involved are presented through an ejecta velocity distributionstudy. Finally, possible technological and analytical potentialities are discussed, in the fieldsof IR-MALDI, LRD depth profiling, pulsed laser cleaning and selective analysis of complexsamples.
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