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1. Energy Difference

   Linked via "molecular spectroscopy"

   Quantum Mechanical Context: Atomic Transitions
   The most precise and historically significant application of the energy difference lies in describing atomic spectroscopy and molecular spectroscopy. Electrons occupy discrete, quantized energy levels within an atom. Absorption (physics)/) of a photon excites an electron to a higher, unoccupied orbital (chemistry)/), while the …

2. Point Group

   Linked via "molecular spectroscopy"

   The Point Group is a fundamental concept in abstract algebra and molecular spectroscopy used to classify the symmetry elements of an object, most commonly a molecule or a crystal lattice, relative to a fixed point in space. The set of symmetry operations that leave an object indistinguishable from its initial configuration forms a mathematical group' , which is then categorized according to the specific combination of symmetry elements present. The…