Strong magnetic-field effects on the states of the helium negative ion below the He (N=2) threshold

Details Strong magnetic-field effects on the states of the helium negative ion below the He (N=2) threshold Strong magnetic-field effects on the states of the helium negative ion below the He (N=2) threshold

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001phrva..64d3402g&link_type=abstract

Physical Review A (Atomic, Molecular, and Optical Physics), Volume 64, Issue 4, October 2001, id.043402

Physics

2

Zeeman And Stark Effects, Properties Of Atoms, Theory Of Electronic Structure, Electronic Transitions, And Chemical Binding, Stellar Atmospheres, Radiative Transfer, Opacity And Line Formation

Scientific paper

Energy levels of the 1s2l2l' 2Se and 2,4Pe,o states of the helium negative ion in magnetic-field strengths up to 4.7011×104 T are calculated by using the multiconfiguration interaction approach. The extended full core plus correlation (FCPC) method and the saddle-point technique are used to construct the nonrelativistic wave functions. We have observed that the field effects on the states considered are quite unusual. In the presence of a magnetic field, three previously unobserved stable states associated with the helium 1s2p 1P and 1s2s 3S thresholds are predicted. The possibility of attracting an extra electron by the parent 1s2 state is also analyzed in the low and medium regime (β<=0.1 a.u.). The opening of new decay channels of the 1s2s2 2S resonance state connected with the higher threshold due to field effects is analyzed. Two significantly different resonance mechanisms for the 1s2s2 state are proposed and discussed briefly.

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