论文信息 - The electron paramagnetic resonance spectrum of Ag2+ 3

The electron paramagnetic resonance spectrum of Ag2+ 3

A highly resolved EPR spectrum of the silver trimer 109Ag2+ 3, present in 109Ag1-NaA zeolite, has been measured. The spectrum is characterized by an axially symmetric spin Hamiltonian having and for each of the 109Ag nuclei The g and hyperfine anisotropy are clearly resolved in the spectrum. The results are compared with theoretical calculations available in the literature. The axial symmetry of the spectrum is attributed to rapid reorientation of the trimer about its threefold axis, so that effects of rhombicity of the hyperfine tensor are averaged out. Between 180 K and 140 K the spectrum changes due to a decrease of the reorientation rate.

T. Wasowicz | A. V. D. Pol | E. D. Boer | J. Michalik | E. J. Reijersen

[1] E. D. Boer,et al. Na43+ clusters in gallosilicate, sodalite, and zeolite NaY , 1989 .

[2] E. D. Boer,et al. Na43+ clusters in sodalite , 1987 .

[3] R. Arratia-Pérez,et al. Dirac scattered‐wave calculations for Ag2+3, Auq+3, and Auq+4 (q=1, 2) clusters , 1986 .

[4] G. Ozin,et al. Magnetic inequivalency in the EPR spectra of small metal clusters , 1986 .

[5] D. M. Lindsay,et al. ESR spectra of Ag3(2A1) in an N2 matrix , 1985 .

[6] G. Ozin,et al. METAL CLUSTER ELECTRONIC AND EPR PROPERTIES: SCF-Xα-SW PREDICTION OF THE MAGNETOGYRIC (G) AND SUPERHYPERFINE TENSORS OF TRIGONAL-BIPYRAMIDAL CHARGE SILVER CLUSTERS AG5Q+ (WHERE Q = 2 OR 4) , 1985 .

[7] C. E. Forbes,et al. An electron spin resonance study of dimeric, trimeric, and tetrameric paramagnetic silver atom clusters , 1974 .

[8] E. D. Boer,et al. On the influence of second-order splitting and sign of the coupling constant in the E.S.R. spectra of polyatomic free radicals , 1962 .

[9] M. Gribnau,et al. MAGRES: a general program for electron spin resonance, ENDOR and ESEEM , 1987 .