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34 PROPERTIES AND EXPECTATION VALUES 257<br />

34.1.2 Expectation values (DENSITY)<br />

DENSITY [,record.file] [,specifications]<br />

If this card is present, the density matrix will be read from record record.file and property expectation<br />

values will be calculated. If the specification record.file is omitted, the last dump record<br />

is used. Density matrices for specific states can be selected using specifications, as explained in<br />

section 4.11. Note that the density matrices are stored in the same record as the orbitals.<br />

34.1.3 Orbital analysis (ORBITAL)<br />

ORBITAL [,record.file] [,specifications]<br />

If this card is present, the orbitals are read from record record.file and an orbital analysis of<br />

the expectation values is printed (the density matrix must also be provided!). If record.file<br />

is omitted, the last dump record is used. This is only meaningful for diagonal density matrices<br />

(SCF or natural orbitals). Natural orbitals for specific states can be selected using specifications,<br />

as explained in section 4.11.<br />

34.1.4 Specification of one-electron operators<br />

The required operators are specified by code words. Optionally, the geometry or the nuclear<br />

centre at which the operator is computed can be specified.<br />

For each operator, an input card of the following form is required:<br />

code,centre,x,y,z,,factor<br />

code specifies the property. The available operators are given in section 6.13.<br />

The other parameters have the following meaning:<br />

centre<br />

x,y,z<br />

factor<br />

row number of Z–matrix or atomic symbol defining the centre at<br />

which property shall be calculated; if centre≠ 0 you need not read<br />

in coordinates.<br />

cartesian coordinates of the point (only if centre=0).<br />

the operator is multiplied by this factor. The default is factor=1 except<br />

for REL. In this cases proper factors for relativistic corrections are<br />

used unless factor is given. The two commas before factor are needed<br />

to preserve compatibility with Molpro96.<br />

34.1.5 Printing options<br />

PRINT,print<br />

This card is used to control output, mainly for debugging purposes.<br />

print= 0<br />

print> 0<br />

no test output (default)<br />

operators are printed.

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