Coulomb Explosion in Nanosecond Laser Fields

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We report experimental observations of Coulomb explosion using a nanosecond laser at 532 nm with intensities less than 10 12 W/cm 2 . We observe multiply charged atomic ions Ar n + (1 ≤ n ≤ 7) and C n + (1 ≤ n ≤ 4) from argon clusters doped with molecules containing aromatic chromophores. The yield of Ar n + depends on the size of the cluster, the number density, and the photostability of the dopant. We propose that resonant absorption of Ar N + achieves a high degree of ionization, and the highly positively charged cluster has the capability to strip electrons from the evaporating Ar + on the surface of the cluster prior to Coulomb explosion, forming Ar n + .