According to Eq. (2.37)

(2.39) |

From the discussion at the end of section 2.4 it follows

= | |||

= | |||

= | |||

= |

(2.40) |

The average may be calculated using the methods of Chapter 1. Usually it is a good approximation to describe with a damped sine function

= | |||

= | |||

= | |||

= | (2.41) |

From Fig. (1.3) we conclude that for , in which case is a simple Gaussian.