274 lines
5.5 KiB
ReStructuredText
274 lines
5.5 KiB
ReStructuredText
.. _module_cisd:
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.. program:: cisd
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.. default-role:: option
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====
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cisd
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====
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This module contains a CI of single and double excitations.
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The user point of view
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----------------------
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The :command:`cisd` program performs the CI of the ROHF-like + all single and double excitations on top of it.
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This program can be very useful to :
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* **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.
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* **Excited states calculations**: generate guess for all the :option:`determinants n_states` wave functions, that will be used by the :c:func:`fci` program.
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The main keywords/options to be used are:
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* :option:`determinants n_states` : number of states to consider for the |cisd| calculation
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* :option:`determinants s2_eig` : force all states to have the desired value of :math:`S^2`
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* :option:`determinants expected_s2` : desired value of :math:`S^2`
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The programmer point of view
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----------------------------
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This module have been built by setting the following rules:
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* The only generator determinant is the Hartree-Fock (single-reference method)
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* All generated determinants are included in the wave function (no perturbative
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selection)
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These rules are set in the ``H_apply.irp.f`` file.
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EZFIO parameters
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----------------
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.. option:: energy
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Variational |CISD| energy
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Programs
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--------
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* :ref:`cisd`
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Subroutines / functions
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-----------------------
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.. c:function:: h_apply_cisd:
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File : :file:`h_apply.irp.f_shell_8`
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.. code:: fortran
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subroutine H_apply_cisd()
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Calls H_apply on the |HF| determinant and selects all connected single and double
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excitations (of the same symmetry). Auto-generated by the ``generate_h_apply`` script.
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Needs:
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.. hlist::
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:columns: 3
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* :c:data:`psi_coef`
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* :c:data:`n_states`
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* :c:data:`generators_bitmask`
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* :c:data:`mo_num`
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* :c:data:`mo_two_e_integrals_in_map`
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* :c:data:`h_apply_buffer_allocated`
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* :c:data:`n_det`
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* :c:data:`s2_eig`
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* :c:data:`n_det_generators`
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* :c:data:`i_bitmask_gen`
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* :c:data:`n_int`
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* :c:data:`psi_det`
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* :c:data:`psi_det_generators`
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* :c:data:`psi_det_generators`
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Calls:
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.. hlist::
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:columns: 3
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* :c:func:`build_fock_tmp`
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* :c:func:`copy_h_apply_buffer_to_wf`
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* :c:func:`dsort`
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* :c:func:`h_apply_cisd_diexc`
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* :c:func:`h_apply_cisd_monoexc`
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* :c:func:`make_s2_eigenfunction`
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* :c:func:`wall_time`
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Touches:
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.. hlist::
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:columns: 3
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* :c:data:`n_det`
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* :c:data:`psi_occ_pattern`
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* :c:data:`c0_weight`
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* :c:data:`psi_coef`
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* :c:data:`psi_det_sorted_bit`
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* :c:data:`psi_det`
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* :c:data:`psi_det_size`
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* :c:data:`psi_det_sorted_bit`
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* :c:data:`psi_occ_pattern`
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.. c:function:: h_apply_cisd_diexc:
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File : :file:`h_apply.irp.f_shell_8`
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.. code:: fortran
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subroutine H_apply_cisd_diexc(key_in, key_prev, hole_1,particl_1, hole_2, particl_2, fock_diag_tmp, i_generator, iproc_in )
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Needs:
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.. hlist::
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:columns: 3
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* :c:data:`n_int`
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* :c:data:`n_det`
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* :c:data:`mo_num`
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Called by:
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.. hlist::
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:columns: 3
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* :c:func:`h_apply_cisd`
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Calls:
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.. hlist::
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:columns: 3
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* :c:func:`h_apply_cisd_diexcp`
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.. c:function:: h_apply_cisd_diexcorg:
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File : :file:`h_apply.irp.f_shell_8`
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.. code:: fortran
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subroutine H_apply_cisd_diexcOrg(key_in,key_mask,hole_1,particl_1,hole_2, particl_2, fock_diag_tmp, i_generator, iproc_in )
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Generate all double excitations of key_in using the bit masks of holes and
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particles.
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Assume N_int is already provided.
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Needs:
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.. hlist::
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:columns: 3
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* :c:data:`n_int`
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* :c:data:`elec_alpha_num`
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* :c:data:`mo_num`
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Called by:
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.. hlist::
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:columns: 3
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* :c:func:`h_apply_cisd_diexcp`
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Calls:
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.. hlist::
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:columns: 3
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* :c:func:`bitstring_to_list_ab`
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* :c:func:`fill_h_apply_buffer_no_selection`
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.. c:function:: h_apply_cisd_diexcp:
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File : :file:`h_apply.irp.f_shell_8`
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.. code:: fortran
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subroutine H_apply_cisd_diexcP(key_in, fs1, fh1, particl_1, fs2, fh2, particl_2, fock_diag_tmp, i_generator, iproc_in )
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Needs:
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.. hlist::
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:columns: 3
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* :c:data:`n_int`
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* :c:data:`n_det`
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* :c:data:`mo_num`
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Called by:
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.. hlist::
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:columns: 3
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* :c:func:`h_apply_cisd_diexc`
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Calls:
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.. hlist::
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:columns: 3
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* :c:func:`h_apply_cisd_diexcorg`
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.. c:function:: h_apply_cisd_monoexc:
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File : :file:`h_apply.irp.f_shell_8`
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.. code:: fortran
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subroutine H_apply_cisd_monoexc(key_in, hole_1,particl_1,fock_diag_tmp,i_generator,iproc_in )
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Generate all single excitations of key_in using the bit masks of holes and
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particles.
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Assume N_int is already provided.
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Needs:
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.. hlist::
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:columns: 3
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* :c:data:`n_int`
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* :c:data:`elec_alpha_num`
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* :c:data:`mo_num`
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Called by:
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.. hlist::
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:columns: 3
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* :c:func:`h_apply_cisd`
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Calls:
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.. hlist::
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:columns: 3
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* :c:func:`bitstring_to_list_ab`
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* :c:func:`fill_h_apply_buffer_no_selection`
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