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We have measured the spontaneous neutral particle emission from coppercluster anions (Cu$_n^-$, $n=3-6$) stored at cryogenic temperatures in one ofthe electrostatic ion storage rings of the DESIREE (Double ElectroStatic IonRing ExpEriment) facility at Stockholm University. The measured rate ofemission from the stored Cu$_3^-$ ions follows a single power law decay forabout 1 ms but then decreases much more rapidly with time. The latter behaviormay be due to a decrease in the density of available final states in Cu$_3$ asthe excitation energies of the decaying ions approach the electron detachmentthreshold. The emissions from Cu$_4^-$, Cu$_5^-$ and Cu$_6^-$ arewell-described by sums of two power laws that are quenched by radiative coolingof the stored ions with characteristic times between a few and hundreds ofmilliseconds. We relate these two-component behaviors to populations of storedions with higher and lower angular momenta. In a separate experiment, westudied the laser-induced decay of Cu$_6^-$ ions that were excited by 1.13 eVor 1.45 eV photons after 46 milliseconds of storage.

Spontaneous decay of small copper cluster anions Cu$_n^-$, $n=3-6$ on long time scales