The absorption spectra of small nickel clusters via photodissociation: NinArm→Nin+mAr

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Abstract
The photodissociation action spectra of NinArm (n=3,4,5, and 7) have been recorded from 306 to 674 nm. The spectra are continuous, with cross sections which increase monotonically into the ultraviolet. It is observed that the photodissociation spectra recorded for Ni3Arm, Ni4Arm, and Ni5Arm are independent on m, indicating a negligible influence of the weakly bound argon atoms on the absorption spectra of the underlying clusters. The oscillator strengths increase monotonically with increasing cluster nuclearity (n) in accord with the Thomas–Reiche–Kuhn sum rule. The results are discussed from both molecular and classical electrodynamic points of view.