## Reduction formula for point group C_{s}

Your representation

E |
_{h} |

9 |
1 |

can be reduced to

Substraction of translational and rotational contributions results in

###
Force field analysis

Infrared and Raman activities (harmonic approximation)
Method |
A' |
A'' |

Infrared |
+ |
+ |

Raman |
+ |
+ |

No. 1 : Total number of force constants .

No. 2 : Total number of force constants k.

No. 3 : Total number of nonvanishing force constants k.

Symmetry properties of force field parameters
Force field |
A' |
A'' |

linear |
2 |
1 |

quadratic |
4 |
2 |

cubic |
6 |
4 |

quartic |
9 |
6 |

Number of independant internal coordinates |
2 |

### Literature

- J.K.G. Watson, J. Mol. Spec.
**41** 229 (1972)

The Numbers of Structural Parameters and Potential Constants of Molecules