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Description of Grotrian diagram
following Moore & Merrill (1968, p. 3):
- The diagrams are often highly simplified omitting many terms and multiplets.
One hopes the lowest terms and strongest multiplets are nearly complete.
- The indicated atomic divisions are the atomic terms.
- The energy scale is in wavenumber in inverse centimeters on the left and eV on the right.
- Allowed multiplets are connected by solid lines.
- Semi-forbidden multiplets are connected by dashed lines.
- Forbidden multiplets are connected by dot-dashed lines.
- Metastable levels are those connected to all downward levels by forbidden lines
or no lines. One hopes this is always true.
- File: Grotrian file:
grotrian_moore_merrill_description.html.