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What are f-centers ?...

What are f-centers ?

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`to` f-centers are the anionic sites occupied by unpaired electrons .
`to` These impart colour to cyrstals . This colour is due to the excitation of electrons when they absorb energy from the visible light .
`to` f- centres are formed by heating alkyl halide with excess of alkali metal .
E.g : NaCl crystal heated in presence of Na-vapour yellow colour is produced due to f-centres .
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    A
    `MLT^(-3)` and `ML^2T^4`
    B
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    B
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