Perform a geometry optimization.
ADF contains two different geometry optimizers. The most recent one is the default and should work more reliably in most cases. It is also very easy to specify constraints with this optimizer: go to the Constraints and Scan panel, and follow the instructions. With this new optimizer the linear transit (Scan) method is also much easier: it is just a series of constrained optimizations. In the Constraints and Scan panel you set how many points, and define the constraints to use. Thus it is very easy to select any distance or angle to use for your linear transit. No longer you need to switch to internal coordinates, and no longer you need to fix the Z-matrix to get the angles that you need.
A limitation of the new optimizer is is that it will not work with Internal coordinates.
Alternatively, you can use the old optimizer. You can select this with the 'Optimizer Method' in the 'Task: GeometryOptimization' panel. The optimization is done using either Cartesian, Internal or Delocalized coordinates. You can select which coordinate type to use in the Coordinates panel.
You can read more about geometry optimizations in the ADF Users Guide.
