Treatment of Be+ ( 1 s? 1)2S Auger resonance with different decouplings of the dilated electron propagator |
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Authors: | Milan N Medikeri and Manoj K Mishra |
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Institution: | (1) Department of Chemistry, Indian Institute of Technology, 400 076 Powai, Bombay, India |
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Abstract: | The diagonal 2ph-TDA and quasiparticle decouplings of the dilated electron propagator (based on an underlying bi-variational
SCF) are utilized to calculate energy and width of the Be+(1s
−1)2S Auger resonance for the first time. Comparison with experimental and other theoretical results reveals that the renormalized
infinite order diagonal 2ph-TDA decoupling seems to offer a less balanced approach to the treatment of resonances than the
second-order decoupling. The diagonal quasiparticle approximation to the self energy is seen to offer an effective and economic
alternative to the non-diagonal propagator calculations. |
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Keywords: | Auger resonance dilated electron propagator decoupling |
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