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PROGRAM:

NAME


input - initializes files prior to a run of Psi

DESCRIPTION


The program input is a preliminary program which reads the input data for the molecule
(geometry, basis set, etc. ) and generates a working file called which is the real
starting point of each calculation. The input program can handle a total of 100 atoms and
1500 unique primitive gaussian functions. The input program limits the use of symmetry
point groups to D2h and its subgroups.

REFERENCES


For STO basis sets:

1. W. J. Hehre, R. F. Stewart and J.A. Pople, J. Chem. Phys. 51 (1969) 2657.

2. W. J. Hehre, R. Ditchfield, R. F. Stewart and J.A. Pople, J. Chem. Phys. 52 (1970)
2769.

For DZ and the old TZ basis sets:

1. S. Huzinaga, J. Chem. Phys. 42 (1965) 1293.

2. T. H. Dunning, J. Chem. Phys. 53 (1970) 2823.

For DZP basis sets:
for Li and Be;

1. A. J. Thakkar, T. Koga, M. Saito, R. E. Hoffmeyer, Inter. J. Quant. Chem. Symp. 27
(1993) 343.

for Na and Mg;

1. S. Huzinaga, Approximate Atomic Wavefunction II, Dept. of Chem. Report, Univ. of
Alberta, Edmonton, Alberta, Canada, 1971.

For the Rydberg and negative ion basis sets:

1. T. H. Dunning, Jr. and P. J. Hay, in Modern Theoretical Chemistry, Volume 3, Ed. H.
F. Schaefer III, Plenum Press, NY, 1977.

For the new TZ basis sets:

1. T. H. Dunning, J. Chem. Phys. 55, (1971) 716.

2. A. D. McLean and G. S. Chandler, J. Chem. Phys., 72 (1980) 5639.

For the general contracted basis sets:

1. T. H. Dunning Jr., J. Chem. Phys. 90, (1989).

2. F. B. van Duijneveldt, IBM Res. Rep. RJ 945 (1971).

For the Wachters basis sets:

1. A. J. H. Wachters, J. Chem. Phys. 52, (1970) 1033.

For the cc-pVXZ (X=D,T,Q) basis sets for hydrogen and the
first row atoms B-Ne:

1. T.H. Dunning, Jr., J. Chem. Phys. 90, 1007 (1989).

For the aug-cc-pVXZ (X=D,T,Q) basis sets for H and B-Ne:

1. R.A. Kendall, T.H. Dunning, Jr., and R.J. Harrison, J. Chem. Phys. 96, 6796
(1992).

For the cc-pVXZ and aug-cc-pVXZ (X=D,T,Q) sets for the
second row atoms Al-Ar:

1. D.E. Woon and T.H. Dunning, Jr., J. Chem. Phys. 98, 1358 (1993).

For the cc-pVXZ (X=D,T,Q) basis sets for helium; cc-pV5Z and
aug-cc-pV5Z basis sets for H, B-Ne, and Al-Ar:

1. D.E. Woon, K.A. Peterson, and T.H. Dunning, Jr. (unpublished).

For the cc-pVXZ and aug-cc-pVXZ (X=D,T,Q) basis sets for
lithium, beryllium, and sodium; cc-pV5Z and aug-cc-pV5Z
basis sets for beryllium:

1. D.E. Woon and T.H. Dunning, Jr. (unpublished).

Also see

1. R. Poirier, R. Kari and I. G. Csizmadia, "Handbook of Gaussian Basis Sets" Phys.
Sci. Data 24 (Elsevier, 1985), and references therein.

INPUT FORMAT


In addition to the standard command-line options supported by all Psi 3 modules, the
following command-line arguments are available:

--keep_chkpt
This option will cause input to keep the checkpoint file and possibly overwrite the
information. By default, input will delete the checkpoint file and create a new
one.

--chkptgeom
This option will cause input to read the geometry from checkpoint file rather than
from the input file.

--chkptmos
This option will cause INPUT to try to recover molecular orbitals from a previous
calculation archived in the checkpoint file. If found, occupied MOs will be
projected onto the new basis. The virtual space is filled up by the virtual MOs
obtained by diagonalizing the core Hamiltonian (even if the new and old basis sets
are identical). This will not affect the subsequent SCF procedure in any way, but
should be kept in mind.

--noproject
This option will prevent projection of MOs onto the new basis. Useful in
combination with the previous option.

--noreorient
This option will prevent the reorientation of the molecule to the reference inertia
frame prior to the determination of the point group.

--nocomshift
This option will prevent shift of the center of mass of the molecule to the origin
prior to the determination of the point group.

--savemos
This option will cause INPUT to try to recover molecular orbitals from a previous
calculation archived in the checkpoint file. If found, the SCF eigenvector and
other information will be stored to file 42.

The input program searches through the default keyword path (first INPUT and then DEFAULT)
for the following keywords:

LABEL = string
This is a descriptive label for the calculation. There is no default.

NORMBASIS = boolean
If NORMBASIS=YES, the molecular orbital coefficients of the occupied orbitals are
given in terms of normalized contracted basis functions. This should always be
true. The default is true.

PRIMNORM = boolean
If PRIMNORM=YES, the contraction coefficients of the D, F, and G primitive
functions that are input should be the ones corresponding to the normalized D(XX),
F(XXX) and G(XXXX) primitives. All of the basis sets provided with Psi require
that this be true. The default is true.

SUBGROUP = string
This is the subgroup to be used in the calculation. For the C1 point group use
string = C1; for Cs use CS; for Ci use CI; for C2 use C2; for C2h use C2H; for C2v
use C2V; and for D2 use D2; There is no default.

UNIQUE_AXIS = string
This keyword specifies which axis in the original (before the principal axis
reorientation) coordinate system should be chosen as the unique axis in the
subgroup specification. For example, if one wants to perform a calculation on a D2h
molecule in C2v symmetry, one has to specify which of the three C2 axes has to
serve as the unique axis. There's no default.

UNITS = string
If string is BOHR, then the GEOMETRY array is in bohr. If string is ANGSTROM, then
the GEOMETRY array is in angstoms. The default is BOHR.

GEOMETRY = array
The array is a vector of cartesian coordinates of EACH atom. Each element of this
vector is another vector in the form ( atom_name x y z). There is no default.

ZMAT = array
The array is a Z-matrix for the molecule. Each element of this vector is another
vector in the general form ( atom_name atom1 bond_distance atom2 valence_angle
atom3 torsional_angle). The first three atoms don't require all of the parameters
to be specified There is no default.

PUREAM = boolean
If boolean is TRUE, then shells with pure angular momentum will be used. Thus, a D
shell will have five function, a F shell will have seven functions, a G shell will
have nine functions, etc. The default is false.

BASIS = string/string_vector
If basis set is given as a single string, the same basis set will be used for all
atoms. Basis set for EACH atom can be specified in a one-dimensional string vector,
however, user must be careful, since only basis sets for unique atoms will be read
from the vector. Basis set for each element type can be specified analogously,
however each element of the basis set vector must be a vector consisting of two
elements: element name and basis set name. There is no default.

BASIS_FILE = string
This keyword specifies the name of an alternate file to be searched for basis set
information. Either an absolute path to the file or a path relative to the current
directory can be used. If the string is terminated by "/" (only directory is
specified) then the default file name "basis.dat" will be appended.

NO_REORIENT = boolean
This keyword is a hack to give user more control in certain situations when
reorientation into the principal frame leaves some symmetry elements undetected.
When set to TRUE, the program will skip this reorientation step. The user then
becomes responsible for providing an initial orientation that is oriented properly
for all symmetry elements to be detected. This can be tricky with Z-matrices, hence
only experts should use this keyword.

KEEP_REF_FRAME = boolean
When this keyword is set to true Psi will keep track of the original coordinate
frame, i.e. the coordinate frame right after the center of mass shift and before
the reorientation into the principal frame. That frame is called reference frame
and, in general, is different from the canonical coordinate frame adopted at the
end of input run and used for computations by all Psi modules programs henceforth.
The information about the reference frame thus need to be stored in the checkpoint
file if Psi modules (such as CINTS) need to transform their frame-dependent results
(such as forces on the nuclei) into the original reference frame for external
programs to use. This keyword becomes useful in finite difference computations
where changes in point group may cause the molecule to reorient - when
KEEP_REF_FRAME is set to TRUE all gradients in FILE11 will be printed in the same
coordinate frame.

PRINT = integer
This controls the amount of information to be printed out. The greater the number -
the more information gets printed. Default (PRINT = 1) should be enough for routine
use.

BASIS SETS


The input program searches through the BASIS keyword path for the basis set information.
It first searches through the user's file, then searches through a file in the working
directory (if one exists), and then through a user specified basis file specified by the
BASIS_FILE keyword (if any). Finally, it searches through the file in the Psi library
directory. The name of the basis set which is searched for is obtained by appending the
atom name to the basis name with a ':' inbetween. The format of the basis set information
is best understood by looking in the file.

STANDARD BASIS SETS


Psi can use use standard basis sets which are provided in a file named in the Psi library
directory. Many of the basis set names contain nonalphanumeric characters. These names
must be surrounded by `"'.

STO This gets the STO-3G basis set which is available for hydrogen-
argon. The STO-3G basis sets for the atoms sodium-argon contain
a D function.

DZ This gets double zeta (DZ) basis set, which is (4s/2s) for
hydrogen, (9s5p/4s2p) for boron-fluorine, and (11s7p/6s4p) for
aluminum-chlorine.

(4S/2S) This gets a DZ basis set for hydrogen.

(9S5P/4S2P) This gets a DZ basis set for boron-fluorine.

(11S7P/6S4P) This gets a DZ basis set for aluminum-chlorine.

DZP-OLD This is a DZ basis set with a shell of polarization functions
added. The exponents of these functions are the old value. It
is available for hydrogen, boron-fluorine, and aluminum-chlorine.

TZ-OLD The old triple zeta (TZ) basis set is (4s/3s) for hydrogen,
(9s5p/5s3p) for boron-fluorine, and (11s7p/7s5p) for aluminum-
chlorine. The TZ basis set is triple zeta in the valence only.
This basis is provided for verification of old results; do not
use it.

TZP-OLD This is the old TZ basis set with the old polarization functions
added. It is available for hydrogen, boron-fluorine, and
aluminum-chlorine. This basis is provided for verification of
old results; do not use it.

(5S/3S) This gets a TZ basis set for hydrogen.

(10S6P/5S3P) This gets a TZ basis set for boron-neon. The TZ basis set is
triple zeta in the valence only.

(12S9P/6S5P) This gets a TZ basis set for sodium-argon. The TZ basis set is
triple zeta in the valence only.

1P_POLARIZATION This gets a set of polarization functions for hydrogen.

1D_POLARIZATION This gets a set of polarization functions for boron-fluorine and
aluminum-chlorine.

2P_POLARIZATION This gets two sets of polarization functions for hydrogen.

2D_POLARIZATION This gets two sets of polarization functions for boron-fluorine
and aluminum-chlorine.

1D_POLARIZATION This gets a set of second polarization functions for hydrogen.

1F_POLARIZATION This gets a set of second polarization functions for boron-
fluorine and aluminum-chlorine.

DZP This gets a (4S/2S) basis with a "1P_POLARIZATION" function for
hydrogen, a (9S5P/4S2P) basis with a "1D_POLARIZATION" funtion
for lithium-flourine, a (11S5P/7S2P) plus two even-tempered p
functions for sodium and magnesium, and a (11S7P/6S4P) basis with
a "1D_POLARIZATION" function for aluminium-chlorine.

TZ2P This gets a (5S/3S) basis with "2P_POLARIZATION" functions for
hydrogen, a (10S6P/5S3P) basis with "2D_POLARIZATION" funtions
for boron-flourine, and a (12S9P/6S5P) basis with
"2D_POLARIZATION" functions for aluminium-chlorine.

DZ_DIF This gets a DZ basis with a diffuse s for hydrogen, and a diffuse
s and diffuse p for boron-flourine, and aluminum-chlorine.

TZ_DIF This gets a TZ basis with a diffuse s for hydrogen, and a diffuse
s and diffuse p for boron-flourine, and aluminum-chlorine.

DZP_DIF This gets the DZP basis with a diffuse s for hydrogen, and a
diffuse s and diffuse p for boron-flourine, and aluminum-
chlorine.

TZ2P_DIF This gets the TZ2P basis with a diffuse s for hydrogen, and a
diffuse s and diffuse p for boron-flourine, and aluminum-
chlorine.

TZ2PF This gets the TZ2P basis and adds "1D_POLARIZATION" for hydrogen
and "1F_POLARIZATION" for boron-flourine, and aluminum-chlorine.

TZ2PD This gets the TZ2PF basis set for hydrogen.

TZ2PF_DIF This gets a TZ2PF basis and adds the appropriate s diffuse
functions for hydrogen and s and p diffuse functions for boron-
flourine, and aluminum-chlorine.

CCPVDZ This gets the segmentally contracted correlation consistent basis
set cc-pVDZ, which is (4s1p/2s1p) for hydrogen and helium,
(9s4p1d/3s2p1d) for lithium - neon, and (12s8p1d/4s3p1d) for
sodium and aluminum - argon.

CCPVTZ This gets the segmentally contracted correlation consistent basis
set cc-pVTZ, which is (5s2p1d/3s2p1d) for hydrogen and helium,
(10s5p2d1f/4s3p2d1f) for lithium - neon, and (15s9p2d1f/5s4p2d1f)
for sodium and aluminum - argon.

CCPVQZ This gets the segmentally contracted correlation consistent basis
set cc-pVQZ, which is (6s3p2d1f/4s3p2d1f) for hydrogen and
helium, (12s6p3d2f1g/5s4p3d2f1g) for lithium - neon, and
(16s11p3d2f1g/6s5p3d2f1g) for sodium and aluminum - argon.

CCPV5Z This gets the segmentally contracted correlation consistent basis
set cc-pV5Z, which is (8s4p3d2f1g/5s4p3d2f1g) for hydrogen and
helium, (14s8p4d3f2g1h/6s5p4d3f2g1h) for beryllium - neon, and
(20s12p4d3f2g1h/7s6p4d3f2g1h) for aluminum - argon.

PLEASE NOTE: The correlation consistent basis sets cc-pVXZ (X =
D, T, Q, 5) are designed for use with pure angular momentum
functions.

AUGCCPVDZ This gets the correlation consistent basis set aug-cc-pVDZ, which
is the cc-pVDZ basis set augmented with optimized diffuse
functions. This is a diffuse (1s1p) set for hydrogen and helium
and a diffuse (1s1p1d) set for lithium - neon, sodium, and
aluminum - argon.

AUGCCPVTZ This gets the correlation consistent basis set aug-cc-pVTZ, which
is the cc-pVTZ basis set augmented with optimized diffuse
functions. This is a diffuse (1s1p1d) set for hydrogen and
helium and a diffuse (1s1p1d1f) set for lithium - neon, sodium,
and aluminum - argon.

AUGCCPVQZ This gets the correlation consistent basis set aug-cc-pVQZ, which
is the cc-pVQZ basis set augmented with optimized diffuse
functions. This is a diffuse (1s1p1d1f) set for hydrogen and
helium and a diffuse (1s1p1d1f1g) set for lithium - neon, sodium,
and aluminum - argon.

AUGCCPV5Z This gets the correlation consistent basis set aug-cc-pV5Z, which
is the cc-pV5Z basis set augmented with optimized diffuse
functions. This is a diffuse (1s1p1d1f1g) set for hydrogen and
helium and a diffuse (1s1p1d1f1g1h) set for beryllium - neon and
aluminum - argon.

GCVDZ A general contracted basis set for hydrogen, for which it is
(4s)/[2s], and for boron-neon for which it is (9s4p)/[3s2p].

GCVTZ A general contracted basis set for hydrogen, for which it is
(5s)/[3s], and for boron-neon for which it is (10s5p)/[4s3p].

GCVQZ A general contracted basis set for hydrogen, for which it is
(6s)/[4s], and for boron-neon for which it is (12s6p)/[5s4p].

GCV1P This gets one P polarization shell for hydrogen (for use with
GCVDZ).

GCV2P This gets two P polarization shells for hydrogen (for use with
GCVTZ).

GCV3P This gets three P polarization shells for hydrogen (for use with
GCVQZ).

GCV1D This gets one D polarization shell for hydrogen (for use with
GCVTZ) and boron-neon (for use with GCVDZ).

GCV2D This gets two D polarization shells for hydrogen (for use with
GCVQZ) and boron-neon (for use with GCVTZ).

GCV3D This gets three D polarization shells for boron-neon (for use
with GCVQZ).

GCV1F This gets one F polarization shell for hydrogen (for use with
GCVQZ) and boron-neon (for use with GCVTZ).

GCV2F This gets two F polarization shells for boron-neon (for use with
GCVQZ).

GCV1G This gets one G polarization shell for boron-neon (for use with
GCVQZ).

GCV1DPURE This is GCV1D with pure angular momentum explicitly turned on.

GCV2DPURE This is GCV2D with pure angular momentum explicitly turned on.

GCV3DPURE This is GCV3D with pure angular momentum explicitly turned on.

GCV1FPURE This is GCV1F with pure angular momentum explicitly turned on.

GCV2FPURE This is GCV2F with pure angular momentum explicitly turned on.

GCV1GPURE This is GCV1G with pure angular momentum explicitly turned on.

GCVDZP A general contracted basis set for hydrogen, for which it is
(4s1p)/[2s1p], and for boron-neon, for which it is
(9s4p1d)/[3s2p1d].

GCVTZP A general contracted basis set for hydrogen, for which it is
(5s2p1d)/[3s2p1d], and for boron-neon, for which it is
(10s5p2d1f)/[4s3p2d1f].

GCVQZP A general contracted basis set for hydrogen, for which it is
(6s3p2d1f)/[4s3p2d1f], and for boron-neon for which it is
(12s6p3d2f1g)/[5s4p3d2f1g].

DUNNING_RYDBERG_3S This gets a Rydberg shell for boron-fluorine.

DUNNING_RYDBERG_3P This gets a Rydberg shell for boron-fluorine.

DUNNING_RYDBERG_3D This gets a Rydberg shell for boron-fluorine and aluminum-
chlorine.

DUNNING_RYDBERG_4S This gets a Rydberg shell for boron-fluorine and aluminum-
chlorine.

DUNNING_RYDBERG_4P This gets a Rydberg shell for boron-fluorine and aluminum-
chlorine.

DUNNING_RYDBERG_4D This gets a Rydberg shell for boron-fluorine.

DUNNING_NEGATIVE_ION_2P This gets a diffuse shell for boron-fluorine and aluminum-
chlorine.

WACHTERS This gets a (14s11p6d/10s8p3d) basis set for potassium,scandium-
zinc.

321G This gets a 3-21G basis set for hydrogen-argon.

631G This gets a 6-31G basis set for hydrogen-argon.

6311G This gets a 6-311G basis set for hydrogen-neon.

631GST This gets a 6-31G* basis set for hydrogen-argon.

631PGS This gets a 6-31+G* basis set for hydrogen-argon.

6311PPGSS This gets a 6-311++G** basis set for hydrogen-neon.

PLUSS This gets a diffuse S (Pople) for hydrogen-argon.

PLUSP This gets a diffuse P (Pople) for hydrogen-argon.

EXAMPLE


The following input is for the water molecule:

default: (
)

input: (
basis = dzp
geometry = ((o 0.0 0.00000000 0.00000000)
(h 0.0 -1.49495900 0.99859206)
(h 0.0 1.49495900 0.99859206))
)

The following input is equivalent to the above example:

default: (
)

input: (
basis = ( (o dzp)
(h dzp) )
geometry = ((oxygen 0.0 0.00000000 0.00000000)
(hydrogen 0.0 -1.49495900 0.99859206)
(hydrogen 0.0 1.49495900 0.99859206))
)

The following is an example of Z-matrix specification

default: (
)

input: (
basis = ( (oxygen ccpv6z)
(hydrogen ccpv5z) )
zmat = ((x)
(o 1 1.0)
(h 2 0.995 1 127.75)
(h 2 0.995 1 127.75 3 180.0)
)
)

BASIS SET EXAMPLE


The following lines input could be placed in an input file to redefine the hydrogen DZP
basis set. Note that double quotes must be used when a basis set name has special
characters in it.

basis: (
% definition for hydrogen's DZP basis:
hydrogen:dzp = (
% inserts hydrogen:dz:
(get "DZ")
% uses pbasis.dat for polarization:
(get "DUNNING_POLARIZATION")
)
% definition for hydrogen's DZ basis:
hydrogen:dz = (
% inserts hydrogen:"HUZINAGA-DUNNING_(9S/4S)":
(get "HUZINAGA-DUNNING_(9S/4S)")
)
% definition for hydrogen's (9s/4s) basis:
hydrogen:"HUZINAGA-DUNNING_(9S/4S)" = (
(S ( 19.2406 0.032828)
( 2.8992 0.231208)
( 0.6534 0.817238))
(S ( 0.1776 1.0))
)
)

FILES SUBSECTION EXAMPLE


The following lines input could be placed in an input file to define an alternate location
to look for basis set information. Note that double quotes must be used when a string has
special characters in it.

input: (
basis = (mydzp mydzp mydzp)
geometry = ((o 0.0 0.00000000 0.00000000)
(h 0.0 -1.49495900 0.99859206)
(h 0.0 1.49495900 0.99859206))
% I like to keep everything in my chem applications
% sub directory.
% Basis set is in
% /home/general/user/chem/my_very_own.basis
basis_file = "/home/general/user/chem/my_very_own.basis"
)

input: (
basis_file = "/home/general/user/basis/dzp_plus_diff/"
% I like to keep everything in it's own directory.
% Basis set is in
% /home/general/user/basis/dzp_plus_diff/basis.dat
basis = dzpdiff
geometry = ((o 0.0 0.00000000 0.00000000)
(h 0.0 -1.49495900 0.99859206)
(h 0.0 1.49495900 0.99859206) )
)

LAST THINGS


This program has been written by Edward F. Valeev, Dr. Justin T. Fermann, and Timothy J.
Van Huis. Authors would like to thank Dr. T. Daniel Crawford and Rollin A. King for help.
Any problems should be e-mailed to evaleev@schroedinger.ccqc.uga.edu.

Psi Release 3 input(1)

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