Doubly excited states in the negative hydrogen ion
Atomfysik, Stockholms Universitet, Frescativägen 24, 104 05 Stockholm, Sweden
Revised: 18 October 1999
Published online: 15 June 2000
We present a detailed analysis of doubly excited resonances in H- of both and symmetry. Both resonance positions and total widths for auto-detachment are calculated using complex coordinate scaling in a Sturmian-type basis in perimetric coordinates. The resonances are classified by approximate quantum numbers with help of their Lewis structures. For the first time, a new class of shape resonances is reported which can be understood as resulting from couplings between different adiabatic potentials with both binding and repulsive character. In addition, we present an analysis of the so called mass polarisation term which gives rise to specific isotope shifts.
PACS: 31.15.Ar – Ab initio calculations / 31.50.+w – Excited states / 32.80.Dz – Autoionization
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000