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(ii) Draw an energy level diagram for an electronic transition from an electronic ground state to an excited state that has a

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Answer #1

The vibrational energy level diagrams for the two cases are shown in the image below.

(ii) The electronic transition from an electronic ground state to an excited state results in the increase in the internuclear distance between the two atoms in a molecule,i.e., bond length is increased as shown below:

length is -Bond increased o excited state (121) Energy Ground state (W=0) Internuclear distance

(iii) The vibrational transition from one energy level to another occurs by following the selection rule of v=±1. The energy levels corresponding to each vibrational level is given by the expression:

E, = (v + 5)wosccm-1

By putting v=1,2,3,... so on we get to know all the various energy levels as shown below:

1 06 I wosc V-4 & (ahoroug // wosc ŞWosc Selection rule - AVEL V =2 31, Wosc / vel v -o wosc Internuclear distance (6)

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