Multielectron spectroscopy : energy levels of K<sup><em>n</em></sup>⁺ and Rb<sup><em>n</em></sup>⁺ ions (<em>n</em> = 2, 3, 4)
Khalal, M A; Soronen, J; Jänkälä, K; Huttula, S-M; Huttula, M; Bizau, J-M; Cubaynes, D; Guilbaud, S; Ito, K; Andric, L; Feng, J; Lablanquie, P; Palaudoux, J; Penent, F (2017-10-30)
M A Khalal et al 2017 J. Phys. B: At. Mol. Opt. Phys.50 225003
© 2017 IOP Publishing Ltd.
A magnetic bottle time-of-flight spectrometer has been used to perform spectroscopy of K n⁺ and Rb n⁺ states with ionization degrees n of 2, 3 and 4. Energy levels are directly measured by detecting in coincidence the n electrons that are emitted as a result of single photon absorption. Experimental results are compared with the energies from the NIST atomic database and ab initio multiconfiguration Dirac–Fock calculations. Previously unidentified 3p ⁴(³P)3d ¹ ⁴D energy levels of K²⁺ are assigned.
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