# 4.2.35. MPPROP¶

## 4.2.35.1. Description¶

The MPPROP is a general distributed multipole expansion, and a first order polarizabilty analysis program. It will use the one electron integrals to generate the distribution. The order of the distributed multipole expansion is defined by SEWARD. In order to generate distributed multipoles of higher order than 2. One has to use the Keyword MULTipoles in SEWARD. SEWARD also needs the Keyword NEMO to arrange the integrals in correct order.

## 4.2.35.2. Dependencies¶

The MPPROP program requires the one-electron integral file ONEINT and the communications file RUNFILE, which contains among others the multipole integrals produced by SEWARD.

## 4.2.35.3. Files¶

Below is a list of the files that are used/created by the program MPPROP.

### 4.2.35.3.1. Input files¶

ONEINT

One-electron integral file generated by the program SEWARD.

RUNFILE

File for communication of auxiliary information generated by the different programs e.g. SEWARD.

INPORB

SCFORB or RASORB file containing the orbitals of a previous SCF run or a RASSCF run, which are used now as vectors in the MPPROP run.

### 4.2.35.3.2. Output files¶

MPPROP

The distributed multipole expansion.

## 4.2.35.4. Input¶

Below follows a description of the input to MPPROP. The keywords are always significant to four characters, but in order to make the input more transparent, it is recommended to use the full keywords. The MPPROP program section of the Molcas input starts with the program:

&MPPROP


There are no compulsory keywords.

### 4.2.35.4.1. Optional general keywords¶

BONDs

Use this Keyword to define bond between atoms. This Keyword should be followed by a line of atomlabels separated by a space. The following line can define another bond. This Keyword should be ended by a END statement in the last line. The example below means that O1 will bond to H1 and H2. It does not mean that H1 is bonded to H2.

BOND
O1 H1 H2
END

TITLe

This Keyword specifies the title of the molecule. This will be recognized by the Nemo package. And you are requested to use this Keyword. It is defined in the program as a Character*80.

LUMOrb

This Keyword tells MPPROP to use an INPORB file for the one electron densities.

TYPE

This is to specify the typen of the atom. Where the first number is the atomnumber m, counted in the order it was defined in SEWARD. The second number is the type of the atom n.

TYPE
m n

POLArizability

This specifies if the polarizability should be calculated or not.

POLArizability
m


m=0 Means no polarizability should be calculated.

m=1 (Default) Means polarizability should be calculated.

NONEarestAtom

The program is written in the way that multipoles should be moved to the nearest atom if the nearest atom is closer than any of the bonding atoms. Note that the move will be to atoms and not nearest bond.

ALLCenter

This Keyword means that all centers are considered for the distributed multipole expansion.

### 4.2.35.4.2. Limitations¶

The limitations on the order of the multipole expansion is defined by SEWARD. While the polarizability can only be calculated directly in the program for an scf wavefunction. And it is limited to first order polarizability

### 4.2.35.4.3. Input examples¶

First we have the bare minimum of input. This will work well for all systems.

&MPPROP


The next example is a bit more elaborate and show how to use a few of the keywords. The system is formic-acid.

&Gateway
Title
Fa
NEMO
Basis set
C.ANO-L...3s2p1d.
C1      2.15211991525414     -3.97152266198745      4.15134452433510
End of Basis set

Basis set
O.ANO-L...4s3p1d.
O2     3.99101917304681     -2.23465022227817      3.72611355598476
O3     2.36712399248396     -5.81178517731397      5.48680572323840
End of Basis set

Basis set
H.ANO-L...3s1p.
H4      0.43787447048429     -3.44210745229883      3.08410918233085
End of Basis set

Basis set
H.ANO-L...3s2p.
H5     5.46574083366162     -2.78397269852552      4.70186773165853
End of Basis set

&Seward

&Scf
Title
Formic-acid
Occupied
12

&MPPROP
Title
Formic-acid
lumorb
POLArizability
1
BONDs
C1 O2 O3 H4
O2 H5
End
TYPE
2 1
3 2
4 1
5 2
End