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I am trying to figure out how does the Ti4+ Fe2+ charge transfer complex produces the blue color of sapphire quantitavily... as it is given here:

http://www.webexhibits.org/causesofcolor/8.html"

How is it possible to calculate that this particular charge transfer requires absorption of "yellow light (~2eV)" giving rise to the complementary blue color, using very simple quantum physics because I am no expert ???

Is it possible to use bohr model and simple electromagnetism???

I will highly appreciate your contributions.

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# HOW TO CALCULATE THE RESULTS OF Fe2+ Ti4+ CHARGE TRANSFER COMPLEX IN SAPPHIRE

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