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)
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)
Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter4: Introduction To Quantum Mechanics
Section: Chapter Questions
Problem 38P: Using a simple particle-in-a-box model for the multiple bonding in 1,2-butadiene (see Example 4.7)...
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Electronic Transitions and Spectroscopy
The term “electronic” connotes electron, and the term “transition” implies transformation. In a molecule, the electrons move from a lower to a higher energy state due to excitation. The two energy states, the ground state and the excited state are the lowest and the highest energy states, respectively. An energy change is observed with this transition, which depicts the various data related to the molecule.
Photoelectron Spectroscopy
Photoelectron spectroscopy (PES) is a part of experimental chemistry. It is a technique used in laboratories that involves projecting intense beams of radiation on a sample element. In response, the element ejects electrons for which the relative energies are measured.
Question
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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