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Absorption and Emission at same wavelength?

enter image description hereIs it possible for a molecule to absorb and emit at the same wavelength? What is the reason behind it?

I’m working on charged Tin porphyrins and got the excitation and emission (fluorescence) wavelength around 400nm.

For clarification, I have attached the exciation and emission profile for the tin system. Can somebody help what would be the reason?enter image description here

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