Warning

Only the calculation of the density is tested for open shell configurations (and relies on a correct .OCCUPATION). All other properties are only tested for closed shell systems and should not be trusted for open shell systems without a thorough testing.

**VISUAL

.LIST

Calculate various densities in few points. Example (3 points; coordinates in bohr):

.LIST
 3
 1.0 0.0 0.0
 0.0 1.0 0.0
 0.0 0.0 1.0

.LINE

Calculate various densities along a line. Example (line connecting two points; 200 steps; coordinates in bohr):

.LINE
 0.0 0.0 0.0
 0.0 0.0 5.0
 200

Scalar and vector densities are written to files plot.line.scalar and plot.line.vector, respectively, and should be saved after calculation, e.g.

pam --get=plot.line.scalar ...

The first three columns of the output files gives the coordinates (x, y, z) of the point. It is then followed by one/three columns giving the value of the scalar/vector density in that point.

.2D

Calculate various densities in a plane. The plane is specified using 3 points that have to form a right angle. Example (coordinates in bohr):

.2D
 0.0  0.0  0.0     !origin
 0.0  0.0 10.0     !"right"
 200               !nr of points origin-"right"
 0.0 10.0  0.0     !"top"
 200               !nr of points origin-"top"

.2D_INT

Integrate various densities in a plane using Gauss-Lobatto quadrature. The plane is specified using 3 points that have to form a right angle. Example (coordinates in bohr):

.2D_INT
 0.0  0.0  0.0     !origin
 0.0  0.0 10.0     !"right"
 10                !nr of tiles to the "right"
 0.0 10.0  0.0     !"top"
 10                !nr of tiles to the "right"
 5                 !order of the Legendre polynomial for each tile

.3D

Calculate various densities in 3D and write to cube file format. Example (coordinates in bohr):

.3D
 40 40 40          ! 40 x 40 x 40 points

.3DFAST

Fast evaluation of the molecular electrostatic potential. Example (coordinates in bohr):

.3DFAST
 40 40 40          ! 40 x 40 x 40 points

.3DADD

Add space around the cube file. Default (coordinates in bohr):

.3D_ADD
 4.0

.3D_INT

Integrate densities in 3D.

.SCALE

Scale densities by a factor. Default:

.SCALE
 1.0

.DENSITY

Compute density. Example (unperturbed density):

.DENSITY
 DFCOEF

Another example (perturbed density, first response vector):

.DENSITY
 PAMXVC 1

.ELF

Compute the electron localization function. Example:

.ELF
 DFCOEF

.GAMMA5

Compute the electron chirality density. Example:

.GAMMA5
 DFCOEF

.JDIA

Compute the nonrelativistic diamagnetic current density. Example:

.JDIA
 DFCOEF

.J

Compute the current density. Example (use first response vector):

.J
 PAMXVC 1

.DIVJ

Compute the divergence of the current density. Example (use first response vector):

.DIVJ
 PAMXVC 1

.ROTJ

Compute the curl of the current density. Example (use first response vector):

.ROTJ
 PAMXVC 1

.ESP

Compute the electrostatic potential. Example:

.ESP
 DFCOEF

.ESPE

Compute the electronic part of the electrostatic potential.

.ESPN

Compute the nuclear part of the electrostatic potential.

.ESPRHO

Compute the electrostatic potential times density.

.ESPERHO

Compute the electronic part of the electrostatic potential times density.

.ESPNRHO

Compute the nuclear part of the electrostatic potential times density.

.GAUGE

Specify gauge origin. Example:

.GAUGE
 0.0 0.0 0.0

.RADIAL

Compute radial densities.

.SMALLAO

Force evaluation of small component basis functions.

.OCCUPATION

Specify occupation of orbitals. Example (neon atom):

.OCCUPATION
 2
 1 1-2 1.0
 2 1-3 1.0

The first line after the keyword gives the number of subsequent lines to read. In each line, the first number is the fermion ircop. In molecules with inversion symmetry there are two fermion ircops: gerade (1) and ungerade (2). Otherwise there is a single fermion ircop (1). The specification of the fermion ircop is followed by the range of selected orbitals and their occupation. If a single orbital is specified a single number is given instead of the range.

Another example (water):

.OCCUPATION
 1
 1 1-5 1.0

Another example (nitrogen atom):

.OCCUPATION
 2
 1 1-2 1.0
 2 1-3 0.5

.LONDON

Activate LAO contribution.

.NONE

Select “none” connection when when plotting LAO perturbed densities.

.NODIRECT

Skip direct LAO contribution when plotting perturbed densities.

.NOREORTHO

Skip LAO reorthonormalization contribution when plotting perturbed densities.

.NOKAPPA

Skip orbital relaxation contribution when plotting perturbed densities.