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Why are n -> p* and p -> p* the most commonly observed electronic transitions in...

Why are n -> p* and p -> p* the most commonly observed electronic transitions in chromophores? What factors limit the observation of certain electronic transitions such as the s -> s* event? What consequences might you anticipate from exposure to radiation sufficient to promote the s -> s* transition in proteins?

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Various transitions which are involved in the UV spectrocopy are explained and on the basis of the these transitions it was concluded that n-p and n-p* tranisitions are the most commonly observed transitions whereas s-s* transitions are the least observed due to very high energy gap between ground state and excited states.

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