Isotope shift studies in the first spectrum of dysprosium: confirmation of assignments to 4f105d6p and new assignments to 4f95d6s6p configuration

B. K. Ankush; A. Venugopalan; S. A. Ahmad

doi:10.1007/s100530050359

EPJ

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2024 Impact factor 1.5

Atomic, Molecular, Optical and Plasma Physics

Eur. Phys. J. D 7, 139-149 (1999)
https://doi.org/10.1007/s100530050359

Isotope shift studies in the first spectrum of dysprosium: confirmation of assignments to 4f¹⁰5d6p and new assignments to 4f⁹5d6s6p configuration

B. K. Ankush, A. Venugopalan and S. A. Ahmad

Spectroscopy Division, Bhabha Atomic Research Centre, Mumbai, 400 085, India

Received: 3 August 1998
Published online: 15 September 1999

Abstract

Isotope shifts $\Delta\sigma$ ( $\rm {}^{160} Dy$ - $\rm {}^{164}Dy$ ) are reported for 221 spectral lines of the neutral dysprosium atom (Dy I) in the region 470–565 nm using a photoelectric recording Fabry-Perot spectrometer and highly enriched isotopic samples of $\rm {}^{160}Dy$ and $\rm{}^{164}Dy$ excited in liquid-nitrogen–cooled hollow-cathode lamps. Isotope shift data for 173 of these lines are being reported for the first time. Using the isotope shift data, term isotope shifts $\Delta T$ ( $\rm{}^{160}Dy$ - $\rm {}^{164}Dy$ ) have been evaluated for 99 even- and 68 odd-parity energy levels of Dy I. New $\Delta T$ values have been obtained for 24 odd and 36 even levels. These new $\Delta T$ values have enabled us to check some of the existing tentative assignments and also to suggest configuration assignments to a few unassigned energy levels. The earlier tentative assignments of $4f^{10}5d6p$ configuration to many high odd levels lying above $\rm 35000\;cm^{-1}$ have been presently confirmed. We could assign the $4f^95d6s6p$ configuration to 24 unassigned even levels.