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Zhang and coworkers have recently reported results of experiments involvingirradiation of argon clusters doped with bromofluorene chromophores bynanosecond-long pulses of 532 nm laser light. Multiply-charged ions of atomicargon (charge states, n, up to 7) and carbon (charge states up to 4) areobserved which are sought to be rationalised using an evaporation model. Thedistinguishing facet of exploding clusters being progenitors of energetic ionsand electrons constitutes the key driver for contemporary research inlaser-cluster interactions; it is, therefore, important to point outinconsistencies that are intrinsic to the model of Zhang and coworkers. Inlight of similar reports already in the literature, we show that their model isof limited utility in describing the dynamics that govern how fast,multiply-charged atomic ions result from laser irradiation of gas-phaseclusters. We posit that it is plasma behaviour that underpins cluster heatingand cluster explosion dynamics.

On the Generation of Multiply Charged Argon Ions in Nanosecond Laser Field Ionization of Argon