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Abstract
SynopsisA novel mechanism is proposed for creating long-lived metastable atomic negative ions in complex atoms. It exploits the orbital collapse of the 5d orbital in Gd (Z=64) into the 4f orbital of Tb (Z=65). In the region of collapse the properties of the 5d and 4f orbitals are quite sensitive to the changes in the effective potential. Consequently the collapse phenomenon impacts significantly the core-polarization interaction in the relevant atoms. The mechanism is demonstrated in Tb and Dy through the appearance of long-lived Tb− and Dy− anions in the Regge-pole calculated electron elastic cross sections.
Highlights
In the region of collapse the properties of the 5d and 4f orbitals are quite sensitive to the changes in the effective potential
The collapsed 5d orbital in Gd leads to maximum polarization in the Dy atom
The proposed mechanism of creating longlived metastable negative ions should be observable in both the Z=65 and Z=66 atoms through the appearance of dramatically sharp resonances in the newly generated TCSs
Summary
In the region of collapse the properties of the 5d and 4f orbitals are quite sensitive to the changes in the effective potential.
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