ESR spectra of Ag3(2A1) in an N2matrix

摘要

ESR spectra assigned to Ag3molecules have been produced by codepositing atomic silver with excess nitrogen at temperatures close to 4.2 K. The spectra are characterized by an axially symmetric spin Hamiltonian havinggpar;=1.9933(3) andgperp;=1.9558(3) and, for107Ag3,Apar;(1) =310.8(6) G withAperp;(1) =310.1(6) G andApar;(2) =76.0(2) G withAperp;(2) =72.6(2) G for the apical(1) and basal(2) nuclei, respectively. The axial symmetry of the spectra is believed to imply that the trimer is rotating about one axis. There is no evidence for a pseudorotating trimer spectrum. The isotropic spin populations are rgr;5s(1) =0.51 and rgr;5s(2) =0.12 implying an acute angled geometry with ground state symmetry2A1. This is in sharp contrast to the obtuse angled isomer (2B2ground state) found for Ag3in a C6D6matrix. For Ag3(2A1) there is littlepcharacter on the apical atom but a 10percnt;ndash;15percnt;phybridization on each of the two basal nuclei.