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Comprehensive Guide to Atomic Spectroscopy: Emission, Absorption, and Fluorescence

Dive into the world of atomic spectroscopy with this comprehensive PowerPoint template exploring emission, absorption, and fluorescence processes. Understand key concepts like term symbols, Russell-Saunders coupling, and Hund’s rules. Learn about selection rules for photon interaction, and how angular momentum affects atomic transitions. This template is designed to facilitate teaching and presentations, aiding students and educators in grasping complex spectroscopy theories. Ideal for chemistry and physics courses, this resource simplifies intricate topics into an accessible format.

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Comprehensive Guide to Atomic Spectroscopy: Emission, Absorption, and Fluorescence

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  1. Atomic Spectroscopy: Emission, Absorption & Fluorescence Powerpoint Templates

  2. Term Symbols L = 0, 1, 2, ... S, P, D J = L + S

  3. L = | l1 + l2|, | l1 + l2 - 1|, ..., | l1 - l2| S = | s1 + s2|, | s1 + s2 - 1|, ..., | s1 - s2|

  4. J = L + S | L + S |, | L + S - 1|, ..., | L - S | Russell-Saunders Coupling jj – Coupling ji = li + si | j1 + j2|, | j1 + j2 - 1|, ..., | j1 - j2|

  5. Hund’s Rules • The lowest energy term is that which has the greatest spin multiplicity. • For terms that have the same spin multiplicity, the term with the highest orbital angular momentum lies lowest in energy. • spin-orbit coupling (more pronounced for heavier nuclei) splits terms intolevels. • { If the unfilled subshell is exactly or more than half full, the level with the highest J value has the lowest energy. • { If the unfilled subshell is less than half full, the level with the lowest J value has the lowest energy.

  6. Selection Rules Helicity of a photon σ = ± 1 (Physically analogous to the angular momentum along the axis of propagation) Upon absorption or emission of a photon the atom must change the momentum along the zz axis (considered collinear with the axis of propagation) in ± 1 ΔJ = 0; ± 1 (but J ≠ 0 if ΔJ = 0) ΔMJ= 0; ± 1 (but ΔMJ≠ 0 if J = 0)

  7. Electric dipole Transition moment Spin wave functions are differentially zero (αβ) or one (αα). ΔS = 0 allowed ΔS ≠ 0 forbidden

  8. Grotrian Diagrams Hydrogen

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