"Hyperfine Structure Quantum Number"@en . . "http://en.wikipedia.org/wiki/Quantum_number"^^ . . "The \"Hyperfine Structure Quantum Number\" is a quantum number of an atom describing inclination of the nuclear spin with respect to a quantization axis given by the magnetic field produced by the orbital electrons." . . "F" . . "http://www.iso.org/iso/catalogue_detail?csnumber=31894"^^ . . "http://en.wikipedia.org/wiki/Hyperfine_structure"^^ .