J. Goslar et al., VIBRONIC AVERAGING EFFECT IN ESEEM SPECTRA OF (NH4)(2)MG(SO4)(2)CENTER-DOT-6H(2)O SINGLE-CRYSTAL DOPED WITH JAHN-TELLER ACTIVE CU(H2O)(6) COMPLEXES, Inorganic chemistry, 37(22), 1998, pp. 5936
Vibronic behavior of the Cu(H2O)(6)(2+) in (NH4)(2)Mg- (SO4)(2). 6H(2)
O is not a local phenomenon but involves surrounding molecular groups
forming a vibronic cluster. It is observed by temperature variations o
f the Fourier transform spectra of electron spin-echo decay.