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Chemistry LibreTexts

Fundamentals of Spectroscopy

  • Page ID
    • Electromagnetic Radiation
    • Introduction to Spectroscopy
    • Lineshape Functions
      Four different mathematical descriptions of the lineshape for an absorptive transition are discussed below. These transitions may involve electronic, rotational, or vibrational (i.e. visible, microwave or infrared radiation) eigenstates.
    • Selection Rules
      A selection rule describes how the probability of transitioning from one level to another cannot be zero. It has two sub-pieces: a gross selection rule and a specific selection rule. A gross selection rule illustrates characteristic requirements for atoms or molecules to display a spectrum of a given kind, such as an IR spectroscopy or a microwave spectroscopy.
    • Selection rules and transition moment integral
      In chemistry and physics, selection rules define the transition probability from one eigenstate to another eigenstate. In this topic, we are going to discuss the transition moment, which is the key to understanding the intrinsic transition probabilities. Selection rules have been divided into the electronic selection rules, vibrational selection rules (including Franck-Condon principle and vibronic coupling), and rotational selection rules.
    • The Power of the Fourier Transform for Spectroscopists
    • Time-resolved vs. Frequency Resolved

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