$A_{g7}$ CLUSTER: PENTAGONAL BIPYRAMID

Abstract

The analysis of a well-resolved electron-spin-resonance (ESR) spectrum of a silver cluster trapped in solid neon at $4^{\circ}K$ has established it as $A_{g_{7}}$. 109Ag hyperfine structure shows that the single electron spin is interacting strongly with two equivalent (axial) Ag nuclei and weakly with five equivalent (equatorial) Ag nuclei. It has $D_{5h}$ symmetry and a $^{2}A_{2}{^{-}}$ ground state. These properties are analogous to its Group IA alkali-metal counterparts.