Radical Redistribution of the $4 d$ Oscillator Strength Observed in the Photoabsorption of the Ba, ${Ba}^{+}$ , and ${Ba}^{+ +}$ Sequence

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19 October 1981

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 47 (16) , 1124-1128
https://doi.org/10.1103/physrevlett.47.1124

Abstract

The vacuum-ultraviolet absorption spectra of isolated Ba,

{Ba}^{+}

, and

{Ba}^{+ +}

have been measured. In Ba and

{Ba}^{+}

most of the

4 d

absorption oscillator strength is in the continuum, but in

{Ba}^{+ +}

several very strong discrete transitions are observed. Such behavior has never before been observed in the

4 d

photoabsorption of vapors, solids, or compounds. An interpretation is given in terms of the partial collapse of the

nf

bound states in

{Ba}^{+ +}

.

Keywords

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