1. Whereas the excitation scan showed two features (bands, or peaks), the emission scan only showed...

1. Whereas the excitation scan showed two features (bands, or peaks), the emission scan only showed one band. Why is this?

Expert Solution

Dear friend your answer is

Most of the compounds do not emit light after absorption of radiation. so these molecules do not have an excitation spectrum. The reason is that the absorbed energy can dissipate in the molecule without emitting light/Potons. Secondly, molecules absorb light to different excited states. Emission comes from the lowest of these states, called the E1 state. When a molecule is excited to a higher state it often ends up in this lowest excited state E1 and then emits radiation. In this case the excitation spectrum is the same as the absorption spectrum. However from a higher excited state a molecule does not have to go to the lowest excited state. It can directly go to the ground state for instance. Then it does not emit radiation. In this case the excitation spectrum only has the lowest energy absoption features. In spectroscopy terms: the excitation spectrum shows the Eo-E1, the Eo-E2, Eo-E3 etc bands, but the emission spectrum only shows the E1-E0 band.

THANK YOU, ALL THE BEST.

queen_honey_blossom answered 2 years ago

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