Abstract
Mixed clusters of the form (NO)mArn(m ≤ 4,n ≤ 22)are produced in a supersonic expansion and photoionized by nonresonant two-photon absorption of 266 nm photons. The ions are subsequently separated and detected by time-of-flight mass spectrometry. Anomalously large relative intensities are observed for the cluster ions, NO+Arn(n= 12,18,22) and (NO)2+Arn(n = 17,21), and are attributed to extra stability of these ions. These ‘‘magic numbers’’ at (m+n)=13,19,23 are compared to those observed in rare gas clusters and other M+Arn heteroclusters and assigned to icosahedral structures. Other cluster ions of the form (NO)+mNO2, (NO)+mN2O, N2O+Arn, and (NO)+mH2O are observed and briefly discussed.
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