Parity

Parity
is a parameter for AtomicState that specifies the parity of the state.
Parity[state]
returns the value specified for Parity in AtomicState state, or Parity[StateLabel[state]] if it is not specified.
  • Possible values for Parity are Even and Odd.
  • Parity is automatically threaded over a list of AtomicState objects appearing as its argument.
  • The value of Parity is used to determine which states are coupled by the E1 Hamiltonian.
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A three level system with two even-parity states and one odd-parity state:
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Get the values of Parity:
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Opposite-parity states are coupled by the E1 Hamiltonian, but same-parity states are not:
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By default, LevelDiagram puts even-parity states on the left and odd-parity states on the right:
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