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- https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Physical_Chemistry_(LibreTexts)/13%3A_Molecular_Spectroscopy/13.02%3A_Rotations_Accompany_Vibrational_TransitionsThis page explains the rovibrational spectra of diatomic gas molecules, detailing vibrational and rotational transitions influenced by quantum selection rules and bond length changes. It covers energy...This page explains the rovibrational spectra of diatomic gas molecules, detailing vibrational and rotational transitions influenced by quantum selection rules and bond length changes. It covers energy quantization, resulting in P- and R-branches, and discusses the rotational constant B and the Q-branch in spectroscopy.
- https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Physical_Chemistry_(LibreTexts)/13%3A_Molecular_SpectroscopyThis page discusses spectroscopy, focusing on its role in understanding electromagnetic radiation's interaction with atoms and molecules. It covers aspects including vibrational, rotational transition...This page discusses spectroscopy, focusing on its role in understanding electromagnetic radiation's interaction with atoms and molecules. It covers aspects including vibrational, rotational transitions, and electronic spectra, highlighting principles such as the Franck-Condon Principle and selection rules. Group theory is mentioned for its predictive power in IR and Raman activity, while the characteristics of molecular spectra are linked to factors like normal modes and rotational inertia.
- https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Physical_Chemistry_(LibreTexts)/13%3A_Molecular_Spectroscopy/13.12%3A_The_Selection_Rule_for_the_Rigid_RotorThis page explains selection rules that govern transition probabilities between quantum levels during the absorption or emission of electromagnetic radiation. It discusses gross and specific selection...This page explains selection rules that govern transition probabilities between quantum levels during the absorption or emission of electromagnetic radiation. It discusses gross and specific selection rules, emphasizing that a molecule must have a permanent dipole moment for rotational spectra and outlines the rule ΔJ=±1 for absorptive transitions. These principles are relevant for both electronic and orbital angular momentum transitions.
