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hi please what does u ungerad and g gerade means in physics

hi
 please what does  u ungerad and  g gerade means in physics

Grade:6

1 Answers

sagar kumar
99 Points
6 years ago
It states that electronic transitions that conserve parity, either symmetry or antisymmetry with respect to an inversion centre — i.e., g (gerade = even (German)) → g, or u (ungerade = odd) → u respectively—are forbidden. ... A designation of g for an orbital means there is symmetry with respect to an inversion center.

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