# The I341
Angular Function

This page prepared by Andrew
Murray (7th August, 1996)

### The following figure shows a 3-D image of the Angular
function I341

### This is one of the 44
basis angular functions which is used to parameterise the (e,2e) Differential
Cross Section for Symmetric Angles

Figure 1. The I341
Angular function shown with the axes used to define the function. For the
parameterisation of the (e,2e) Differential cross section, the z-axis is
chosen as the incident electron beam direction. The x-axis is chosen to
lie in the Detection plane of the analysers. **The colour scheme reflects
the sign of the function**. **PURPLE
**indicates the function is **POSITIVE
**whereas **RED **indicates
that the function is **NEGATIVE**.
Other colours are due to image generation errors.

This figure can be downloaded for further perusal as a high
resolution EPS file.

The functional form of this angular function is given by

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