The Yellow Color of Silver‐Containing Zeolite A
1998
: Not the Ag clusters, but rather the O atoms are responsible for the yellow color of silver-containing zeolite A. The reason for this has remained unclear since 1962. It is now shown that a charge-transfer transition from the lattice oxygen atoms to the empty 5s orbital of the silver ions (shown schematically on the right) is responsible for the yellow coloring.
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