tine.  At present, 18 different types of collision systems are
included.<p>
For each particular choice of collision system, the user also needs to supply the crucial <tt>POT</tt>
subroutine, which delineates the range of values of <img src=lambda10.gif> in the above equation
and which calculates the expansion coefficients, <i>V<sub><img src=lambda10.gif></sub></i>(<i>R</i>).
<p>
At present, a number of different <tt>POT</tt> subroutines are supplied with the Hibridon<font size=-2><sup>TM</sup></font> packag