Heavy-Ion and Laser-Pulse Induced Ejection of Large Organic Molecules

Ejection from the solid state of large, thermally-labile organic molecules occurs due to the energy deposited by fast heavy ions or by laser-pulse excitation of a matrix material. Laser-pulse-induced ejection is described using the ‘pressure pulse’ model developed for heavy-ion-induced ejection and its relationship to sublimation is considered. Since the rate of energy deposition for ‘nano-second lasers’ is slow compared to that for heavy-ion-induced ejection, processes that affect the ability to form a pressure pulse prior to significant energy dissipation and dispersion are considered. An expression for analyzing yield data is given in which ion yields depend on ion formation/destruction via the local energy density and the total yield depends on the ejection mechanism.