3.14.5 Surface Potential Evaluation

For $GEOMOD \ne 3$, the simplified surface potential calculation is used with $V_{gsfbeff,acc}$, $F_{1,acc}$ and $r_{1,acc}$ calculated above together with $r_2 = 0$, $V_{ch} = 0$. Then the normalized charge is evaluated the following way:

$q_{i,acc} = V_{gsfbeff,acc} - \dfrac{2kT}{q} [ln (\beta) - ln (cos(\beta)) + F_{1,acc}] \qquad (3.345)$

Similarly for $GEOMOD = 3$, the surface potential calculations are performed with $V_{gsfbeff,acc}$ and $r_{1,acc}$, with $r_2$ and $V_{ch}$ both set to 0. The normalized charge in this case is give by,

$q_{i,acc} = q_{0,acc} \cdot g \qquad (3.410)$

It may be noted here that $q_{i,acc} = 0$ if $CAPMOD = 0$ or $BULKMOD = 0$.