Emission of PEG (polyethylene glycol) molecules and ions from an ice target induced by laser irradiation in the infrared (IR) regime at 1064 nm was studied. Matrices of 1 wt% PEG flash-frozen solutions were used for polymer deposition with MAPLE (matrix assisted pulsed laser evaporation). Even though linear absorption in defect-free water ice is two orders of magnitude larger at 1064 ran than 355 nm, the deposition rate and ion current density are much smaller for IR than for ultraviolet laser light. The similarity of results for both wavelengths indicates that non-linear absorption by electrons via optical breakdown is dominant. (c) 2006 Elsevier B.V. All rights reserved.
Chemical Physics Letters, 2006, Vol 427, Issue 4-6, p. 251-254