Electronic Spectroscopy - Interpretation - Chemistry LibreTexts
Jan 30, 2023 · The following section will discuss the interpretation of electronic absorption spectra given the nature of the chemical species being studied. This includes an understanding of the molecular or elemental electronic state symmetries, Russell-Sanders states, spin multiplicities, and forbidden and allowed transitions of a given species.
10: Electronic Spectroscopy - Chemistry LibreTexts
The electronic states that result from these excited orbital configurations are characterized by term symbols and are essential in understanding the spectra and energy level structure of atoms, and the orbital electron configurations.
Electronic Spectra of Molecules - HyperPhysics
Molecules exhibit electronic spectra from transitions between electron energy levels. These spectra are more complex than those of atomic spectra which involve transitions between electron energy levels which typically produce sharp line spectra.
Lecture 30 and part 31: Electronic Spectroscopy. Franck-Condon. Highlights • “Electronic Structure” and “Dynamics” atom → diatomic molecule → small polyatomic → large molecules gas phase → condensed phase molecule breaks. radiative decay → non–radiative decay @R. dephasing • Kinds of spectra: rotation, vibration, electronic
14.4: Electronic Spectroscopy - Chemistry LibreTexts
14.4: Electronic Spectroscopy. Page ID. This page explains what happens when organic compounds absorb UV or visible light, and why the wavelength of light absorbed varies from compound to compound.
In this chapter, we begin with a discussion of the basic principles of the electronic spectroscopy of diatomic molecules.(6,7) The rest of the chapter is devoted to a discussion of the ab initio calculation of molecular prop-erties associated with the electronic spectra of diatomic molecules.
• describe electronic spectra of diatomic molecules • know about vibronic transitions and Franck Condon Principle • discuss energy levels, molecular orbitals and electronic spectra of polyatomic
9.3: Molecular Spectra - Physics LibreTexts
Electronic transitions are of order 1 eV, vibrational transitions are of order \ (10^ {-2}eV\), and rotational transitions are of order \ (10^ {-3}eV\). For complex molecules, these energy changes are difficult to characterize, so we begin with the simple case of a diatomic molecule.
You will use your spectra for chemical identification, study of electronic properties of organic molecules and semiconductor quantum dots, assessment of how electronic energy levels are affected by their surroundings in a solid, and other purposes.
Hence, electronic absorption spectra may be used to assess the force fields and dissociation energies of electronically excited molecules (by using a Birge-Sponer plot).