Exchange-correlation potential negative ions

Moisture prevents iodine from a direct interaction and gives rise to a restricted blue shift. For alkali-exchanged faujasites a Hnear negative correlation of the absorption energy with the ionization potentials of the counter ions and the Si/Al ratio, respectively, could be estabUshed. Due to the larger hypsochromic shift it must be concluded that the FAU framework has a higher donor strength than LTA. 

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