8. Electronic Spectroscopy. Vibrational spectroscopy refers to changes in vibrational energy levels. Electronic spectroscopy refers to the photon energy absorbed or emitted by a molecule from electron transitions between different possible electronic states. On the diagram below, Draw arrows to illustrate the processes, and Label with the letters shown in bold. a) Franck-Condon principle for electronic excitation (F-C), from vibrational ground state v = 0. b) Collisional Relaxation in the excited states without photon emission (CR) c) Return to the ground state via Fluorescence (F)

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8. Electronic Spectroscopy. Vibrational spectroscopy refers to changes in vibrational energy levels. Electronic
spectroscopy refers to the photon energy absorbed or emitted by a molecule from electron transitions between
different possible electronic states.
On the diagram below, Draw arrows to illustrate the processes, and Label with the letters shown in bold.
a) Franck-Condon principle for electronic excitation (F-C), from vibrational ground state v = 0.
b) Collisional Relaxation in the excited states without photon emission (CR)
c) Return to the ground state via Fluorescence (F)
d)
Intersystem Crossing (ISC)
e)
Return to the ground state via Phosphorescence (P)
f)
Infra Red absorbance of one quantum of vibrational energy from v = 0 in the ground state (IR)
Raman scattering that allows transition from v = 0 to v = 1, in the ground state (RAMAN)
On the x-axis, indicate the bond lengths re and ro for the ground electronic state only.
Draw an arrow to show the magnitude of the Zero Point Energy (ZPE)
Briefly state why ZPE exists.
h)
i)
j)
Ground Electronic state
Singlet state
Triplet state
Transcribed Image Text:8. Electronic Spectroscopy. Vibrational spectroscopy refers to changes in vibrational energy levels. Electronic spectroscopy refers to the photon energy absorbed or emitted by a molecule from electron transitions between different possible electronic states. On the diagram below, Draw arrows to illustrate the processes, and Label with the letters shown in bold. a) Franck-Condon principle for electronic excitation (F-C), from vibrational ground state v = 0. b) Collisional Relaxation in the excited states without photon emission (CR) c) Return to the ground state via Fluorescence (F) d) Intersystem Crossing (ISC) e) Return to the ground state via Phosphorescence (P) f) Infra Red absorbance of one quantum of vibrational energy from v = 0 in the ground state (IR) Raman scattering that allows transition from v = 0 to v = 1, in the ground state (RAMAN) On the x-axis, indicate the bond lengths re and ro for the ground electronic state only. Draw an arrow to show the magnitude of the Zero Point Energy (ZPE) Briefly state why ZPE exists. h) i) j) Ground Electronic state Singlet state Triplet state
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