THE ANTIFERROMAGNETIC $Mn_{2}$ Molecule
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Date
1981
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Ohio State University
Abstract
Nesbet in 1964$^{1}$, calculated that $Mn_{2}$ should be an antiferromagnetic molecule ($^{1}\Sigma_{g}^{+}$ lowest State) with an exchange interaction constant J =-$4.1 cm^{-1}$ It is here reported that this has been verified by electron-spin-resonance spectroscopy of the $Mn_{2}$ molecule formed in solid krypton and xenon matrices at $4^{\circ} K$ by measurements at higher temperatures. The complexity of the spectra increase as the temperature rises, with each line split Into II distinct hyperfine components separated by 15 G and with relative intensities 1:2:3:4:5:6:5:4:3:2:1. This splitting is about one-half for that for single $^{55}$Mn atoms as expected for two exchange-coupled atoms. Tentative assignments indicate that $J = - 20 cm^{-1}$ and that the zero-field-splitting in the S = 2 and S = 3 spin states are $|D| \simeq$ 0.14 and $0.07 cm^{-1}$, respectively. Other research, suggested by these observations, will be mentioned. $^{1}$R.K. Nesbet, Phys, Rev. A135, 460 (1964).
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