±isovalue option meaning in visualizing molecular orbitals

[hadi9827]

Dear all,

When I visualize molecular orbitals (for example HOMO or LUMO), when I tick the ±isovalue option, the orbitals will be shown with two colors red and blue. What do these colors mean? what is the difference between blue and red regions?

Thanks

[Anders Blom]

For isosurfaces, the Red/Blue indicate the sign, whereas the surface itself show the same absolute isovalue.

[hadi9827]

Thanks