# Asymmetric Top Rotational Transition Moment

This represents the interaction of the molecular rotational
magnetic moment with an external magnetic field, and is typically
written in spherical tensor notation as:

μ_{N}B.Σ_{k=0..2}(-1)^{k}((2k+1)/3)^{½}T^{1}(g_{r}^{k},S)

Note that all the parameters have units of nuclear magnetons but
published values will often use Bohr magnetons. Normally only the
diagonal terms, g_{r}^{aa},
g_{r}^{bb}
and g_{r}^{cc},
are determined.

## Parameters

graa |
g_{r}^{aa};
Default is 0 Nuclear magnetons |

grbb |
g_{r}^{bb};_{ }Default is
0 Nuclear magnetons |

grcc |
g_{r}^{cc};_{ }Default is
0 Nuclear magnetons |

grabbar |
½(g_{r}^{ab} + g_{r}^{ba}); Default is 0 Nuclear
magnetons. |

gracbar |
½(g_{r}^{ac} + g_{r}^{ca}); Default is 0 Nuclear
magnetons. |

grbcbar |
½(g_{r}^{bc} + g_{r}^{cb}); Default is 0 Nuclear
magnetons. |

gramb |
g_{r}^{ab} - g_{r}^{ba}; Default is 0 Nuclear
magnetons. |

gramc |
g_{r}^{ac} - g_{r}^{ca}; Default is 0 Nuclear
magnetons. |

grbmc |
g_{r}^{bc} - g_{r}^{cb}; Default is 0 Nuclear
magnetons. |