Determination of the Fine and Hyperfine Structure and Lifetimes of the (1S2S2P) QUADRUPLET-P(0) Metastable Autoionizing States of LITHIUM-6 and LITHIUM-7.

Morris R. Levitt

Published Jan 1, 1968• 0 citations

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Published Jan 1, 1968• 0 citations

OpenAlex

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Determination of Energies and Lifetimes of the Metastable Auto-Ionizing (1s2s2p)P4 States of Li6 and Li7 by a Zeeman-Quenching Technique

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A Zeeman-quenching atomic-beam method has been utilized for the determination of the fine- and hyperfine-structure energies and auto-ionization lifetimes of the metastable $(1s2s2p)^{4}P_{J}$ states of ${\mathrm{Li}}^{6}$ and ${\mathrm{Li}}^{7}$ . Both the fine-structure intervals and the lifetimes of the $J=\frac{3}{2}$ and $J=\frac{1}{2}$ states are found to be in disagreement with existing theoretical calculations. The quenching of metastable lithium atoms in a nonuniform magnetic field can be satisfactorily described with the aid of the "adiabatic criterion." The present results also permit a quantitative evaluation of a proposal for producing polarized lithium nuclei.A Zeeman-quenching atomic-beam method has been utilized for the determination of the fine- and hyperfine-structure energies and auto-ionization lifetimes of the metastable $(1s2s2p)^{4}P_{J}$ states of ${\mathrm{Li}}^{6}$ and ${\mathrm{Li}}^{7}$. Both the fine-structure intervals and the lifetimes of the $J=\frac{3}{2}$ and $J=\frac{1}{2}$ states are found to be in disagreement with existing theoretical calculations. The quenching of metastable lithium atoms in a nonuniform magnetic field can be satisfactorily described with the aid of the "adiabatic criterion." The present results also permit a quantitative evaluation of a proposal for producing polarized lithium nuclei.

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A Zeeman-quenching atomic-beam method has been utilized for the determination of the fine- and hyperfine-structure energies and auto-ionization lifetimes of the metastable

(1s2s2p)^{4}P_{J}

states of

{\mathrm{Li}}^{6}

and

{\mathrm{Li}}^{7}

. Both the fine-structure intervals and the lifetimes of the

J=\frac{3}{2}

and

J=\frac{1}{2}

states are found to be in disagreement with existing theoretical calculations. The quenching of metastable lithium atoms in a nonuniform magnetic field can be satisfactorily described with the aid of the "adiabatic criterion." The present results also permit a quantitative evaluation of a proposal for producing polarized lithium nuclei.

4{p}^{5}(^{2}P)5s5p(^{3}P)^{4}D_{\frac{7}{2}}

and

4{p}^{5}4d(^{3}F)5s^{4}F_{\frac{9}{2}}

, only components of the

^{4}D_{\frac{7}{2}}

were observed in the metastable beam. The atomic-beam resonance method employed resembles traditional methods except that it exploits the differential metastability of the fine-structure levels instead of magnetic deflection for state selection.