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## Parameters of the multiplet

When selecting the HFS method, you must give the name of a file that contains the relative positions and intensities of the components of your multiplet:
LAS> method hfs hfs-n2hp.dat
Relative intensities may be normalized or not. Here follow two examples, for the NH multiplet.
  7               ! 1st line: Number of components
6.9360  1.     ! 1st column: Velocity shift, for each component,
5.9841  5.     !             (in km/s) with respect to the reference
5.5452  3.     !             component you choose (here the 5th one).
0.9560  5.     ! 2nd column: The relative strength of each component.
0.0000  7.     !             Here, they are not normalized.
-0.6109  3.     !
-8.0064  3.     !

  7                  ! As before.
14.9424 1./27.     ! The reference velocity is now that of the last
13.9906 5./27.     ! component.
13.5516 3./27.     ! The intensities are normalized (you could also
8.9624  5./27.     ! put numerical values rather that fractions).
8.0064  7./27.     !
7.3955  3./27.     !
0.      3./27.     !


Let us call and the positions and relative intensities of the components of the multiplet. We define . In the first case, we thus have and .

Gildas manager 2020-10-13