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NAME

       sc::GaussianBasisSet - The GaussianBasisSet class is used describe a basis set composed of
       atomic gaussian orbitals.

SYNOPSIS

       #include <gaussbas.h>

       Inherits sc::SavableState.

   Classes
       class ValueData
           This holds scratch data needed to compute basis function values.

   Public Types
       enum UnitType { Unit }
           This can be given to a CTOR to construct a unit basis function.

   Public Member Functions
       GaussianBasisSet (const Ref< KeyVal > &)
           The KeyVal constructor.
       GaussianBasisSet (UnitType)
           This can be given GaussianBasisSet::Unit to construct a basis set with a single basis
           function that is one everywhere.
       GaussianBasisSet (StateIn &)
       Ref< GaussianBasisSet > operator+ (const Ref< GaussianBasisSet > &B)
           Returns a GaussianBasisSet object that consists of the basis functions for each atom
           in this followed by the basis functions in B for the corresponding atom.
       void save_data_state (StateOut &)
           Save the base classes (with save_data_state) and the members in the same order that
           the StateIn CTOR initializes them.
       const char * name () const
           Return the name of the basis set (is nonnull only if keyword 'name' was provided)
       const char * label () const
           Return the label of the basis set.
       Ref< Molecule > molecule () const
           Return the Molecule object.
       Ref< SCMatrixKit > matrixkit ()
           Returns the SCMatrixKit that is to be used for AO bases.
       Ref< SCMatrixKit > so_matrixkit ()
           Returns the SCMatrixKit that is to be used for SO bases.
       RefSCDimension basisdim ()
           Returns the SCDimension object for the dimension.
       int ncenter () const
           Return the number of centers.
       int nshell () const
           Return the number of shells.
       int nshell_on_center (int icenter) const
           Return the number of shells on the given center.
       int shell_on_center (int icenter, int shell) const
           Return an overall shell number, given a center and the shell number on that center.
       int shell_to_center (int ishell) const
           Return the center on which the given shell is located.
       int shell_to_primitive (int ishell) const
           Return the overall index of the first primitive from the given shell.
       int nbasis () const
           Return the number of basis functions.
       int nbasis_on_center (int icenter) const
           Return the number of basis functions on the given center.
       int nprimitive () const
           Return the number of primitive Gaussians.
       int has_pure () const
           Return true if basis contains solid harmonics Gaussians.
       int max_nfunction_in_shell () const
           Return the maximum number of functions that any shell has.
       int max_ncartesian_in_shell (int aminc=0) const
           Return the maximum number of Cartesian functions that any shell has.
       int max_nprimitive_in_shell () const
           Return the maximum number of primitive Gaussian that any shell has.
       int max_angular_momentum () const
           Return the highest angular momentum in any shell.
       int max_ncontraction () const
           Return the maximum number of Gaussians in a contraction in any shell.
       int max_am_for_contraction (int con) const
           Return the maximum angular momentum found in the given contraction number for any
           shell.
       int max_cartesian () const
           Return the maximum number of Cartesian functions in any shell.
       int shell_to_function (int i) const
           Return the number of the first function in the given shell.
       int function_to_shell (int i) const
           Return the shell to which the given function belongs.
       const GaussianShell & operator() (int i) const
           Return a reference to GaussianShell number i.
       GaussianShell & operator() (int i)
           Return a reference to GaussianShell number i.
       const GaussianShell & operator[] (int i) const
           Return a reference to GaussianShell number i.
       GaussianShell & operator[] (int i)
           Return a reference to GaussianShell number i.
       const GaussianShell & shell (int i) const
           Return a reference to GaussianShell number i.
       GaussianShell & shell (int i)
           Return a reference to GaussianShell number i.
       const GaussianShell & operator() (int icenter, int ishell) const
           Return a reference to GaussianShell number ishell on center icenter.
       GaussianShell & operator() (int icenter, int ishell)
           Return a reference to GaussianShell number ishell on center icenter.
       const GaussianShell & shell (int i, int j) const
           Return a reference to GaussianShell number j on center i.
       GaussianShell & shell (int i, int j)
           Return a reference to GaussianShell number j on center i.
       double r (int icenter, int xyz) const
           The location of center icenter.
       int values (const SCVector3 &r, ValueData *, double *basis_values) const
           Compute the values for this basis set at position r.
       int grad_values (const SCVector3 &r, ValueData *, double *g_values, double
           *basis_values=0) const
           Like values(...), but computes gradients of the basis function values, too.
       int hessian_values (const SCVector3 &r, ValueData *, double *h_values, double *g_values=0,
           double *basis_values=0) const
           Like values(...), but computes first and second derivatives of the basis function
           values, too.
       int shell_values (const SCVector3 &r, int sh, ValueData *, double *basis_values) const
           Compute the values for the given shell functions at position r.
       int grad_shell_values (const SCVector3 &r, int sh, ValueData *, double *g_values, double
           *basis_values=0) const
           Like values(...), but computes gradients of the shell function values, too.
       int hessian_shell_values (const SCVector3 &r, int sh, ValueData *, double *h_values,
           double *g_values=0, double *basis_values=0) const
           Like values(...), but computes first and second derivatives of the shell function
           values, too.
       int equiv (const Ref< GaussianBasisSet > &b)
           Returns true if this and the argument are equivalent.
       void print_brief (std::ostream &=ExEnv::out0()) const
           Print a brief description of the basis set.
       void print (std::ostream &=ExEnv::out0()) const
           Print a detailed description of the basis set.

   Protected Member Functions
       GaussianBasisSet (const GaussianBasisSet &)
       virtual void set_matrixkit (const Ref< SCMatrixKit > &)

   Additional Inherited Members

Detailed Description

       The GaussianBasisSet class is used describe a basis set composed of atomic gaussian
       orbitals.

       Inputs for common basis sets are included in the MPQC distribution. They have been
       obtained from the EMSL Basis Set Database and translated into the MPQC format. The
       citation for this database is below. The technical citation for each basis set is listed
       in the individual basis set data files, in MPQC's lib/basis directory.

       Following is a table with available basis sets listing the supported elements for each
       basis and the number of basis functions for H, $n_0$, first row, $n_1$, and second row,
       $n_2$, atoms. Basis sets with non-alpha-numerical characters in their name must be given
       in quotes.

       Basis SetElements$n_0$$n_1$$n_2$ STO-2GH-Ca159 STO-3GH-Kr159 STO-3G*H-Ar1514 STO-6GH-Kr159
       MINI (Huzinaga)H-Ca159 MINI (Scaled)H-Ca159 MIDI (Huzinaga)H-Na, Al-K2913 DZ (Dunning)H,
       Li, B-Ne, Al-Cl21018 DZP (Dunning)H, Li, B-Ne, Al-Cl51624 DZP + Diffuse (Dunning)H, B-
       Ne6193-21GH-Kr2913 3-21G*H-Ar2919 3-21++GH-Ar31317 3-21++G*H-Ar31323 4-31GH-Ne, P-Cl2913
       6-31GH-Zn2913 6-31G*H-Zn21519 6-31G**H-Zn51519 6-31+G*H-Ar21923 6-31++GH-Ca31317
       6-31++G*H-Ar31923 6-31++G**H-Ar61923 6-311GH-Ca, Ga-Kr31321 6-311G*H-Ca, Ga-Kr31826
       6-311G**H-Ca, Ga-Kr61826 6-311G(2df,2pd)H-Ne, K, Ca14306-311++G**H-Ne7226-311++G(2d,2p)H-
       Ca102735 6-311++G(3df,3pd)H-Ar183947 cc-pVDZH-Ar, Ca, Ga-Kr51418 cc-pVTZH-Ar, Ca, Ga-
       Kr143034 cc-pVQZH-Ar, Ca, Ga-Kr305559 cc-pV5ZH-Ar, Ca, Ga-Kr559195 cc-pV6ZH, He, B-Ne, Al-
       Ar91140144 aug-cc-pVDZH, He, B-Ne, Al-Ar, Ga-Kr92327 aug-cc-pVTZH, He, B-Ne, Al-Ar, Ga-
       Kr234650 aug-cc-pVQZH, He, B-Ne, Al-Ar, Ga-Kr468084 aug-cc-pV5ZH, He, B-Ne, Al-Ar, Ga-
       Kr80127131 aug-cc-pV6ZH, He, B-Ne, Al-Ar127189193 cc-pCVDZLi, B-Ar1827 cc-pCVTZLi, B-
       Ar4359 cc-pCVQZLi, B-Ar84109 cc-pCV5ZB-Ne145aug-cc-pCVDZB-F, Al-Ar2736 aug-cc-pCVTZB-Ne,
       Al-Ar5975 aug-cc-pCVQZB-Ne, Al-Ar109134 aug-cc-pCV5ZB-F181NASA Ames ANOH, B-Ne, Al, P, Ti,
       Fe, Ni305559 pc-0H, C-F, Si-Cl2913 pc-1H, C-F, Si-Cl51418 pc-2H, C-F, Si-Cl143034 pc-3H,
       C-F, Si-Cl346464 pc-4H, C-F, Si-Cl63109105 pc-0-augH, C-F, Si-Cl31317 pc-1-augH, C-F, Si-
       Cl92327 pc-2-augH, C-F, Si-Cl234650 pc-3-augH, C-F, Si-Cl508989 pc-4-augH, C-F, Si-
       Cl88145141

       All basis sets except for the pc-n and pc-n-aug basis sets were obtained from the
       Extensible Computational Chemistry Environment Basis Set Database, Version 12/03/03, as
       developed and distributed by the Molecular Science Computing Facility, Environmental and
       Molecular Sciences Laboratory which is part of the Pacific Northwest Laboratory, P.O. Box
       999, Richland, Washington 99352, USA, and funded by the U.S. Department of Energy. The
       Pacific Northwest Laboratory is a multi-program laboratory operated by Battelle Memorial
       Institute for the U.S. Department of Energy under contract DE-AC06-76RLO 1830. Contact
       David Feller or Karen Schuchardt for further information.

       The pc-n and pc-n-aug basis sets are the polarization consistent basis sets of Frank
       Jensen. See J. Chem. Phys. 115 (2001) 9113; J. Chem. Phys. 116 (2002) 7372; J. Chem. Phys.
       117 (2002) 9234; and J. Chem. Phys. 121 (2004) 3463.

Constructor & Destructor Documentation

   sc::GaussianBasisSet::GaussianBasisSet (const Ref< KeyVal > &)
       The KeyVal constructor.

       molecule
           The gives a Molecule object. The is no default.

       puream
           If this boolean parameter is true then 5D, 7F, etc. will be used. Otherwise all
           cartesian functions will be used. The default depends on the particular basis set.

       name
           This is a string giving the name of the basis set. The above table of basis sets gives
           some of the recognized basis set names. It may be necessary to put the name in double
           quotes. There is no default.

       basis
           This is a vector of basis set names that can give a different basis set to each atom
           in the molecule. If the element vector is given, then it gives different basis sets to
           different elements. The default is to give every atom the basis set specified in name.

       element
           This is a vector of elements. If it is given then it must have the same number of
           entries as the basis vector.

       basisdir
           A string giving a directory where basis set data files are to be sought. See the text
           below for a complete description of what directories are consulted.

       basisfiles
           Each keyword in this vector of files is appended to the directory specified with
           basisdir and basis set data is read from them.

       matrixkit
           Specifies a SCMatrixKit object. It is usually not necessary to give this keyword, as
           the default action should get the correct SCMatrixKit.

       Several files in various directories are checked for basis set data. First, basis sets can
       be given by the user in the basis section at the top level of the main input file. Next,
       if a path is given with the basisdir keyword, then all of the files given with the
       basisfiles keyword are read in after appending their names to the value of basisdir. Basis
       sets can be given in these files in the basis section at the top level as well. If the
       named basis set still cannot be found, then GaussianBasisSet will try convert the basis
       set name to a file name and check first in the directory given by basisdir. Next it checks
       for the environment variable SCLIBDIR. If it is set it will look for the basis file in
       $SCLIBDIR/basis. Otherwise it will look in the source code distribution in the directory
       SC/lib/basis. If the executable has changed machines or the source code has be moved, then
       it may be necessary to copy the library files to your machine and set the SCLIBDIR
       environmental variable.

       The basis set itself is also given in the ParsedKeyVal format. There are two recognized
       formats for basis sets:

       array of shells
           One must specify the keyword :basis: followed by the lowercase atomic name followed by
           : followed by the basis set name (which may need to be placed inside double quotes).
           The value for the keyword is an array of shells. Each shell reads the following
           keywords:

       type
           This is a vector that describes each component of this shell. For each element the
           following two keywords are read:

       am  The angular momentum of the component. This can be given as the letter designation, s,
           p, d, etc. There is no default.

       puream
           If this boolean parameter is true then 5D, 7F, etc. shells are used. The default is
           false. This parameter can be overridden in the GaussianBasisSet specification.

       exp
           This is a vector giving the exponents of the primitive Gaussian functions.

       coef
           This is a matrix giving the coeffients of the primitive Gaussian functions. The first
           index gives the component number of the shell and the second gives the primitive
           number.

           An example might be easier to understand. This is a basis set specificition for STO-2G
           carbon:

       basis: (
        carbon: 'STO-2G': [
         (type: [(am = s)]
          {      exp      coef:0 } = {
             27.38503303 0.43012850
              4.87452205 0.67891353
          })
         (type: [(am = p) (am = s)]
          {     exp      coef:1     coef:0 } = {
              1.13674819 0.04947177 0.51154071
              0.28830936 0.96378241 0.61281990
          })
        ]
       )

       basis set of even-tempered primitive Gaussians
           Such basis set format is given as a group of keywords. The name of the group is
           :basis: followed by the lowercase atomic name followed by : followed by the basis set
           name (which may need to be placed inside double quotes). The group of keywords must
           contain vectors am and nprim, which specify the angular momentum and the number of
           shells in each block of even-tempered primitives. In addition, one must provide any
           two of the following vectors:

       first_exp
           The exponent of the 'tightest' primitive Gaussian in the block.

       last_exp
           The exponent of the most 'diffuse' primitive Gaussian in the block.

       exp_ratio
           The ratio of exponents of consecutive primitive Gaussians in the block.

           Note that the dimensions of each vector must be the same.

       Here's an example of a basis set composed of 2 blocks of even-tempered s-functions and 1
       block of even-tempered p-functions.

       basis: (
        neon: '20s5s13p':(

          am = [ 0 0 1 ]
          nprim = [ 20 5 13 ]
          first_exp = [ 1000.0 0.1  70.0 ]
          last_exp =  [    1.0 0.01  0.1 ]

        )
       )

   sc::GaussianBasisSet::GaussianBasisSet (UnitType)
       This can be given GaussianBasisSet::Unit to construct a basis set with a single basis
       function that is one everywhere. This can be used with integral evaluators to compute
       certain classes of integrals, with limitations.

Member Function Documentation

   int sc::GaussianBasisSet::grad_shell_values (const SCVector3 & r, int sh, ValueData *, double
       * g_values, double * basis_values = 0) const
       Like values(...), but computes gradients of the shell function values, too. See the other
       grad_values(...) members for more information.

   int sc::GaussianBasisSet::grad_values (const SCVector3 & r, ValueData *, double * g_values,
       double * basis_values = 0) const
       Like values(...), but computes gradients of the basis function values, too. The g_values
       argument must be vector of length 3*nbasis. The data will be written in the order bf1_x,
       bf1_y, bf1_z, ...

   int sc::GaussianBasisSet::hessian_shell_values (const SCVector3 & r, int sh, ValueData *,
       double * h_values, double * g_values = 0, double * basis_values = 0) const
       Like values(...), but computes first and second derivatives of the shell function values,
       too. See the other hessian_values(...) members for more information.

   int sc::GaussianBasisSet::hessian_values (const SCVector3 & r, ValueData *, double * h_values,
       double * g_values = 0, double * basis_values = 0) const
       Like values(...), but computes first and second derivatives of the basis function values,
       too. h_values must be vector of length 6*nbasis. The data will be written in the order
       bf1_xx, bf1_yx, bf1_yy, bf1_zx, bf1_zy, bf1_zz, ...

   const char* sc::GaussianBasisSet::label () const [inline]
       Return the label of the basis set. label() return the same string as name() if keyword
       'name' was provided, otherwise it is a unique descriptive string which can be arbitrarily
       long.

       References name().

   int sc::GaussianBasisSet::max_am_for_contraction (int con) const
       Return the maximum angular momentum found in the given contraction number for any shell.

   int sc::GaussianBasisSet::max_ncartesian_in_shell (int aminc = 0) const
       Return the maximum number of Cartesian functions that any shell has. The optional argument
       is an angular momentum increment.

   Ref<GaussianBasisSet> sc::GaussianBasisSet::operator+ (const Ref< GaussianBasisSet > & B)
       Returns a GaussianBasisSet object that consists of the basis functions for each atom in
       this followed by the basis functions in B for the corresponding atom. The Molecule object
       for the two basis sets must be identical.

   double sc::GaussianBasisSet::r (int icenter, int xyz) const
       The location of center icenter. The xyz argument is 0 for x, 1 for y, and 2 for z.

   void sc::GaussianBasisSet::save_data_state (StateOut &) [virtual]
       Save the base classes (with save_data_state) and the members in the same order that the
       StateIn CTOR initializes them. This must be implemented by the derived class if the class
       has data.

       Reimplemented from sc::SavableState.

   int sc::GaussianBasisSet::shell_values (const SCVector3 & r, int sh, ValueData *, double *
       basis_values) const
       Compute the values for the given shell functions at position r. See the other values(...)
       members for more information.

   int sc::GaussianBasisSet::values (const SCVector3 & r, ValueData *, double * basis_values)
       const
       Compute the values for this basis set at position r. The basis_values argument must be
       vector of length nbasis.

Author

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