Parameterising the DCS in terms of Excess Energy using a Polynomial fit to a Cubic Spline placed through the Blalbl0 Parameters.

page prepared by Andrew Murray (20th January, 1999)

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Introduction.

Since the (e,2e) DCS are normalised to unity at the common point x = p/2, only relative changes as a function of energy can be determined.

As no physical model yet exists for the variation of the Blalbl0 with energy, the following procedure is adopted:

This method was used as there is no simple general analytical form for a cubic spline.

The polynomial fit then gives the compact set of 396 parameters blalbl0j :

Figure 1 shows cubic spline fits to the Blalbl0 parameters. The b-parameters which define the normalised DCS as a function of energy and angle can be downloaded here as a text file. More details of the parameters can be accessed by linking from the individual pictures in the figure.


B000 - B770

B011 - B671

B112 - B772

B033 - B673

B224 - B774

B055 - B675

B336 - B776


Link to the (e,2e) Home Page

Look at the Symmetric (e,2e) Data collected by this spectrometer

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Link to the Manchester Electron Scattering group Home Page

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