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Explain in general terms what happens to a molecule when it absorbs a photon: (i) in the UV-visible region of the electromagnetic spectrum; (ii) in the microwave region of the electromagnetic spectrum

(i) In general, when a molecule absorbs a UV-visible photon, an electron is promoted from one of the occupied molecular orbitals to an unoccupied molecular orbital at higher energy.

(ii) In general, when a molecule absorbs a microwave photon, it is promoted from one rotational energy level to the next rotational level at higher energy; for example, from J = 0 to J = 1.

Steven C. GCSE Chemistry tutor, A Level Chemistry tutor, Uni Admissio...

1 year ago

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Steven C.

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“About me Hi there! My name is Steve, and 2 years ago I moved from Edinburgh to Cambridge to pursue a PhD in atmospheric chemistry at the University of Cambridge. I graduated with a 1st class honours degree in Chemistry from Heriot-Wa...”

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