The orbman Section of the Jaguar Input File

The orbman section allows you to reorder orbitals in the guess section of a restart file, or to form linear combinations of orbitals. The format of the orbman section is as follows:

&orbman
hfiglcmo    i, j, α    k, l, β   end
&

where i, j, k, and l are integers indicating the ith, jth, kth, and lth orbitals before mixing (i.e., χi, χj, χk, and χl), and α and β are angles (in degrees) indicating the degree of mixing. The command hfiglcmo mixes the orbitals to form orbitals , , , and according to the following equations:

Note that an angle of 90° permutes the two orbitals, reversing the sign of one.

Each combination operation is performed independently, and the operations are performed in the order they are listed in the orbman section. Each rotation involving a previously altered orbital uses the new, transformed orbital generated by the earlier operations. After all manipulations have been specified, the word “end” should be included.

For UHF wave functions, the syntax is modified slightly, and the alpha and beta spin-orbitals are designated by hfiglcmoa and hfiglcmob:

&orbman
hfiglcmoa    i, j, α    k, l, β   end
hfiglcmob    p, q, γ    r, s, δ   end
&

Single Point Energy Examples

Geometry Optimization Examples