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HyperfineA is a parameter for AtomicState that parameterizes the hyperfine splitting of the state due to the electronic interaction with the nuclear magnetic dipole moment. |

HyperfineA[state] returns the value specified for HyperfineA in AtomicState state, or HyperfineA[StateLabel[state]] if it is not specified. |

- HyperfineA is considered to have units of angular frequency.

- The hyperfine shift of a state with HyperfineA and HyperfineB denoted by and , respectively, is given by , where and , , and are the total, total electronic, and total nuclear angular-momentum quantum numbers, respectively.

- HyperfineA is automatically threaded over a list of AtomicState objects appearing as its argument.