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qp2/docs/source/modules/cisd.rst

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.. _module_cisd:
.. program:: cisd
.. default-role:: option
====
cisd
====
This module contains a CI of single and double excitations.
The user point of view
----------------------
The :command:`cisd` program performs the CI of the ROHF-like + all single and double excitations on top of it.
This program can be very useful to :
* **Ground state calculations**: generate a guess for the ground state wave function if one is not sure that the :c:func:`scf` program gave the lowest SCF solution. In combination with :c:func:`save_natorb` it can produce new |MOs| in order to reperform an :c:func:`scf` optimization.
* **Excited states calculations**: generate guess for all the :option:`determinants n_states` wave functions, that will be used by the :c:func:`fci` program.
The main keywords/options to be used are:
* :option:`determinants n_states` : number of states to consider for the |cisd| calculation
* :option:`determinants s2_eig` : force all states to have the desired value of :math:`S^2`
* :option:`determinants expected_s2` : desired value of :math:`S^2`
The programmer point of view
----------------------------
This module have been built by setting the following rules:
* The only generator determinant is the Hartree-Fock (single-reference method)
* All generated determinants are included in the wave function (no perturbative
selection)
These rules are set in the ``H_apply.irp.f`` file.
EZFIO parameters
----------------
.. option:: energy
Variational |CISD| energy
Programs
--------
* :ref:`cisd`
Subroutines / functions
-----------------------
.. c:function:: h_apply_cisd:
File : :file:`h_apply.irp.f_shell_12`
.. code:: fortran
subroutine H_apply_cisd()
Calls H_apply on the |HF| determinant and selects all connected single and double
excitations (of the same symmetry). Auto-generated by the ``generate_h_apply`` script.
Needs:
.. hlist::
:columns: 3
* :c:data:`psi_coef`
* :c:data:`n_states`
* :c:data:`generators_bitmask`
* :c:data:`mo_num`
* :c:data:`mo_two_e_integrals_in_map`
* :c:data:`h_apply_buffer_allocated`
* :c:data:`n_det`
* :c:data:`s2_eig`
* :c:data:`n_det_generators`
* :c:data:`i_bitmask_gen`
* :c:data:`n_int`
* :c:data:`psi_det`
* :c:data:`psi_det_generators`
* :c:data:`psi_det_generators`
Calls:
.. hlist::
:columns: 3
* :c:func:`build_fock_tmp`
* :c:func:`copy_h_apply_buffer_to_wf`
* :c:func:`dsort`
* :c:func:`h_apply_cisd_diexc`
* :c:func:`h_apply_cisd_monoexc`
* :c:func:`make_s2_eigenfunction`
* :c:func:`wall_time`
Touches:
.. hlist::
:columns: 3
* :c:data:`n_det`
* :c:data:`psi_occ_pattern`
* :c:data:`c0_weight`
* :c:data:`psi_coef`
* :c:data:`psi_det_sorted_bit`
* :c:data:`psi_det`
* :c:data:`psi_det_size`
* :c:data:`psi_det_sorted_bit`
* :c:data:`psi_occ_pattern`
.. c:function:: h_apply_cisd_diexc:
File : :file:`h_apply.irp.f_shell_12`
.. code:: fortran
subroutine H_apply_cisd_diexc(key_in, key_prev, hole_1,particl_1, hole_2, particl_2, fock_diag_tmp, i_generator, iproc_in )
Needs:
.. hlist::
:columns: 3
* :c:data:`n_int`
* :c:data:`n_det`
* :c:data:`mo_num`
Called by:
.. hlist::
:columns: 3
* :c:func:`h_apply_cisd`
Calls:
.. hlist::
:columns: 3
* :c:func:`h_apply_cisd_diexcp`
.. c:function:: h_apply_cisd_diexcorg:
File : :file:`h_apply.irp.f_shell_12`
.. code:: fortran
subroutine H_apply_cisd_diexcOrg(key_in,key_mask,hole_1,particl_1,hole_2, particl_2, fock_diag_tmp, i_generator, iproc_in )
Generate all double excitations of key_in using the bit masks of holes and
particles.
Assume N_int is already provided.
Needs:
.. hlist::
:columns: 3
* :c:data:`n_int`
* :c:data:`elec_alpha_num`
* :c:data:`mo_num`
Called by:
.. hlist::
:columns: 3
* :c:func:`h_apply_cisd_diexcp`
Calls:
.. hlist::
:columns: 3
* :c:func:`bitstring_to_list_ab`
* :c:func:`fill_h_apply_buffer_no_selection`
.. c:function:: h_apply_cisd_diexcp:
File : :file:`h_apply.irp.f_shell_12`
.. code:: fortran
subroutine H_apply_cisd_diexcP(key_in, fs1, fh1, particl_1, fs2, fh2, particl_2, fock_diag_tmp, i_generator, iproc_in )
Needs:
.. hlist::
:columns: 3
* :c:data:`n_int`
* :c:data:`n_det`
* :c:data:`mo_num`
Called by:
.. hlist::
:columns: 3
* :c:func:`h_apply_cisd_diexc`
Calls:
.. hlist::
:columns: 3
* :c:func:`h_apply_cisd_diexcorg`
.. c:function:: h_apply_cisd_monoexc:
File : :file:`h_apply.irp.f_shell_12`
.. code:: fortran
subroutine H_apply_cisd_monoexc(key_in, hole_1,particl_1,fock_diag_tmp,i_generator,iproc_in )
Generate all single excitations of key_in using the bit masks of holes and
particles.
Assume N_int is already provided.
Needs:
.. hlist::
:columns: 3
* :c:data:`n_int`
* :c:data:`elec_alpha_num`
* :c:data:`mo_num`
Called by:
.. hlist::
:columns: 3
* :c:func:`h_apply_cisd`
Calls:
.. hlist::
:columns: 3
* :c:func:`bitstring_to_list_ab`
* :c:func:`fill_h_apply_buffer_no_selection`
.. c:function:: h_apply_cisd_sym:
File : :file:`h_apply.irp.f_shell_12`
.. code:: fortran
subroutine H_apply_cisd_sym()
Calls H_apply on the |HF| determinant and selects all connected single and double
excitations (of the same symmetry). Auto-generated by the ``generate_h_apply`` script.
Needs:
.. hlist::
:columns: 3
* :c:data:`psi_coef`
* :c:data:`n_states`
* :c:data:`generators_bitmask`
* :c:data:`mo_num`
* :c:data:`mo_two_e_integrals_in_map`
* :c:data:`h_apply_buffer_allocated`
* :c:data:`n_det`
* :c:data:`s2_eig`
* :c:data:`n_det_generators`
* :c:data:`i_bitmask_gen`
* :c:data:`n_int`
* :c:data:`psi_det`
* :c:data:`psi_det_generators`
* :c:data:`psi_det_generators`
Calls:
.. hlist::
:columns: 3
* :c:func:`build_fock_tmp`
* :c:func:`copy_h_apply_buffer_to_wf`
* :c:func:`dsort`
* :c:func:`h_apply_cisd_sym_diexc`
* :c:func:`h_apply_cisd_sym_monoexc`
* :c:func:`make_s2_eigenfunction`
* :c:func:`wall_time`
Touches:
.. hlist::
:columns: 3
* :c:data:`n_det`
* :c:data:`psi_occ_pattern`
* :c:data:`c0_weight`
* :c:data:`psi_coef`
* :c:data:`psi_det_sorted_bit`
* :c:data:`psi_det`
* :c:data:`psi_det_size`
* :c:data:`psi_det_sorted_bit`
* :c:data:`psi_occ_pattern`
.. c:function:: h_apply_cisd_sym_diexc:
File : :file:`h_apply.irp.f_shell_12`
.. code:: fortran
subroutine H_apply_cisd_sym_diexc(key_in, key_prev, hole_1,particl_1, hole_2, particl_2, fock_diag_tmp, i_generator, iproc_in )
Needs:
.. hlist::
:columns: 3
* :c:data:`n_int`
* :c:data:`n_det`
* :c:data:`mo_num`
Called by:
.. hlist::
:columns: 3
* :c:func:`h_apply_cisd_sym`
Calls:
.. hlist::
:columns: 3
* :c:func:`h_apply_cisd_sym_diexcp`
.. c:function:: h_apply_cisd_sym_diexcorg:
File : :file:`h_apply.irp.f_shell_12`
.. code:: fortran
subroutine H_apply_cisd_sym_diexcOrg(key_in,key_mask,hole_1,particl_1,hole_2, particl_2, fock_diag_tmp, i_generator, iproc_in )
Generate all double excitations of key_in using the bit masks of holes and
particles.
Assume N_int is already provided.
Needs:
.. hlist::
:columns: 3
* :c:data:`n_int`
* :c:data:`elec_alpha_num`
* :c:data:`mo_num`
Called by:
.. hlist::
:columns: 3
* :c:func:`h_apply_cisd_sym_diexcp`
Calls:
.. hlist::
:columns: 3
* :c:func:`bitstring_to_list_ab`
* :c:func:`connected_to_hf`
* :c:func:`fill_h_apply_buffer_no_selection`
.. c:function:: h_apply_cisd_sym_diexcp:
File : :file:`h_apply.irp.f_shell_12`
.. code:: fortran
subroutine H_apply_cisd_sym_diexcP(key_in, fs1, fh1, particl_1, fs2, fh2, particl_2, fock_diag_tmp, i_generator, iproc_in )
Needs:
.. hlist::
:columns: 3
* :c:data:`n_int`
* :c:data:`n_det`
* :c:data:`mo_num`
Called by:
.. hlist::
:columns: 3
* :c:func:`h_apply_cisd_sym_diexc`
Calls:
.. hlist::
:columns: 3
* :c:func:`h_apply_cisd_sym_diexcorg`
.. c:function:: h_apply_cisd_sym_monoexc:
File : :file:`h_apply.irp.f_shell_12`
.. code:: fortran
subroutine H_apply_cisd_sym_monoexc(key_in, hole_1,particl_1,fock_diag_tmp,i_generator,iproc_in )
Generate all single excitations of key_in using the bit masks of holes and
particles.
Assume N_int is already provided.
Needs:
.. hlist::
:columns: 3
* :c:data:`n_int`
* :c:data:`elec_alpha_num`
* :c:data:`mo_num`
Called by:
.. hlist::
:columns: 3
* :c:func:`h_apply_cisd_sym`
Calls:
.. hlist::
:columns: 3
* :c:func:`bitstring_to_list_ab`
* :c:func:`connected_to_hf`
* :c:func:`fill_h_apply_buffer_no_selection`