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Hyperfine Structure of Gold

1939; American Institute of Physics; Volume: 55; Issue: 2 Linguagem: Inglês

10.1103/physrev.55.170

1536-6065

Robert M. Elliott, J. Wulff,

Molecular spectroscopy and chirality

The spectrum of Au I and Au II has been examined for hyperfine structure in the region $\ensuremath{\lambda}2300\ensuremath{-}6300\mathrm{A}$. Splitting has been observed in more than eight lines of the spectrum of Au I, whereas the hyperfine structure of Au II lines could not be resolved. From the four-component structure of the lines $\ensuremath{\lambda}4437\mathrm{A}$ and $\ensuremath{\lambda}4607\mathrm{A}$ it is shown that the mechanical moment of the gold nucleus is (3/2) ($\frac{h}{2\ensuremath{\pi}}$). The effect of self-reversal in the resonance lines has been investigated and eliminated. The magnetic moment determined from the splitting of the unreversed resonance line $\ensuremath{\lambda}2428\mathrm{A}$ is found to be 0.195 proton-magneton. No other determination of the magnetic moment is at present possible because of the intermediate coupling shown to exist in the complex electronic configurations of Au I and the inadequacies of the present theory of hyperfine structure. The splitting of the $^{2}P_{\frac{1}{2}}$ level is estimated and found to be in approximate agreement with that calculated from the $^{2}S_{\frac{1}{2}}$ level. No indication of any abnormally large $^{2}P_{\frac{1}{2}}$ separation or of any isotope shift has been found.