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Difference Between Atomic or Molecular Spectroscopy

Posted: Thu Nov 01, 2018 1:19 am
by Sydni Stewart
The Quantum World outline says, "With respect to electron transitions that give rise to a UV or visible spectrum: understand the
difference between electronic transitions in atomic orbitals (atomic spectroscopy) and electronic
transitions in molecular orbitals (molecular spectroscopy)."

What is the difference?

Re: Difference Between Atomic or Molecular Spectroscopy

Posted: Thu Nov 01, 2018 10:52 am
by Sydney To 1D
Atomic and Molecular Spectroscopy present more similarities than differences. Electrons in atoms can be excited to higher energy states and electrons in molecules can also be excited to high energy states. As a result, both atoms and molecules give rise to spectra.

Re: Difference Between Atomic or Molecular Spectroscopy

Posted: Thu Nov 01, 2018 8:18 pm
by klarratt2
Atomic spectra are the transitions of electrons between electronic energy levels in isolated atoms. They are affected by interactions of the transitioning electrons with the nuclei spins and with the other electrons in the atom.

Molecular spectra involve transitions in molecules with two or more atoms (either the same or different). Since the valence electrons are now in different orbitals from the atomic orbitals and the orbital structure has changed the electronic transitions are different.