Abstract
Model potential parameters and basis sets are reported for the As atom. LCGTO MP LSD calculations employing both VWN and Xα potentials were performed for the As 2 and As 4 molecules. For both molecules the geometrical and spectroscopic results are in very good agreement with the available experimental data and with other ab initio studies. The HeI photoelectron spectra have been reproduced for both the systems. The calculated spectra are in excellent agreement with the experiment and the use of the VWN potential gives the most accurate results.
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