An Etymological Dictionary of Astronomy and Astrophysics

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rigorous selection rule
  رزن ِ گزینش ِ فرسخت  
razan-e gozineš-e farsaxt
Fr.: règle de sélection rigoureuse  

A → selection rule obeyed by → discrete transitions. Among them are: rigorous selection rules for → electric dipole transitions (→ permitted) requiring:

  1. ΔJ must be 0 or ± 1 with J = 0 ↔ 0 forbidden.
  2. ΔMJ = 0, ± 1.
  3. → Parity change, i.e. even ↔ odd.

See also: → rigorous; → selection; → rule.