Coulomb autoionisation of Li I quartet states above the Li+(1s2s)3S threshold

14 June 1987

journal article
Published by IOP Publishing in Journal of Physics B: Atomic and Molecular Physics

Vol. 20 (11) , L341-L346
https://doi.org/10.1088/0022-3700/20/11/004

Abstract

Four distinct structures are observed in the zero-degree projectile electron energy spectra of 300 keV lithium ions excited in C foils. The lowest single narrow peak has a centre of mass energy 140 meV and is attributed to Coulomb autoionisation of the Li I ((1s2p)³P^o3p)⁴D initial state, e.g. ((1s2p)³P^o3p)⁴D to ((1s2s)³S in d)⁴D. A second rather sharp peak has a centre of mass energy of 360 meV and originates from Coulomb autoionisation of the Li I((1s2p)³P^o3p)⁴S state decaying into the ((1s2s)³S in s)⁴S continuum. Finally, a third broader peak, centred at 610 meV, results from the ((1s2p)³P^o3d)⁴F^o to ((1s3s)³S in f)⁴F^o rapidly autoionising transition. Theoretically the (1s2p nl) quartet levels of lithium are calculated within the framework of the saddle point technique and the complex-rotation method.

Keywords

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