Abstract
A study of the structure and photodetachment of the negative ion has been performed using many-body theory. An electron affinity for the of 0.273 eV was calculated within the Dyson equation method. A new approach for concurrent consideration of intrachannel and interchannel interactions and dynamic-core polarization and relaxation (screening) effects has been developed to calculate the total and partial photodetachment cross sections. The photoabsorption spectrum reveals a complex interference structure due to correlations between the two outer subshells, primarily strong interaction with the shape resonance. The influence of many-electron dynamic corrections on the photodetachment process is discussed. The resonance and interference profiles have been shown to be very sensitive to the proper account of collective phenomena. Reasonable agreement between the calculations and experimental data has been achieved.
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