94 lines
2.7 KiB
Plaintext
94 lines
2.7 KiB
Plaintext
---
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title: PSI4Driver (v0.31)
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description: API reference for qiskit.chemistry.drivers.PSI4Driver in qiskit v0.31
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in_page_toc_min_heading_level: 1
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python_api_type: class
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python_api_name: qiskit.chemistry.drivers.PSI4Driver
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---
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# PSI4Driver
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<Class id="qiskit.chemistry.drivers.PSI4Driver" isDedicatedPage={true} github="https://github.com/qiskit-community/qiskit-aqua/tree/stable/0.9/qiskit/chemistry/drivers/psi4d/psi4driver.py" signature="PSI4Driver(config='molecule h2 {\\n 0 1\\n H 0.0 0.0 0.0\\n H 0.0 0.0 0.735\\n}\\n\\nset {\\n basis sto-3g\\n scf_type pk\\n reference rhf\\n', molecule=None, basis='sto-3g', hf_method=<HFMethodType.RHF: 'rhf'>)" modifiers="class">
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Bases: `qiskit.chemistry.drivers.fermionic_driver.FermionicDriver`
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Qiskit chemistry driver using the PSI4 program.
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See [http://www.psicode.org/](http://www.psicode.org/)
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**Parameters**
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* **config** (`Union`\[`str`, `List`\[`str`]]) – A molecular configuration conforming to PSI4 format.
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* **molecule** (`Optional`\[`Molecule`]) – A driver independent Molecule definition instance may be provided. When a molecule is supplied the config parameter is ignored and the Molecule instance, along with basis and hf\_method is used to build a basic config instead. The Molecule object is read when the driver is run and converted to the driver dependent configuration for the computation. This allows, for example, the Molecule geometry to be updated to compute different points.
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* **basis** (`str`) – Basis set
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* **hf\_method** (`HFMethodType`) – Hartree-Fock Method type
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**Raises**
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[**QiskitChemistryError**](qiskit.chemistry.QiskitChemistryError "qiskit.chemistry.QiskitChemistryError") – Invalid Input
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## Methods
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<span id="qiskit-chemistry-drivers-psi4driver-run" />
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### run
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<Function id="qiskit.chemistry.drivers.PSI4Driver.run" signature="PSI4Driver.run()">
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Runs driver to produce a QMolecule output.
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**Return type**
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`QMolecule`
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**Returns**
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A QMolecule containing the molecular data.
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</Function>
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## Attributes
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### basis
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<Attribute id="qiskit.chemistry.drivers.PSI4Driver.basis">
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return basis
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**Return type**
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`str`
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</Attribute>
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### hf\_method
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<Attribute id="qiskit.chemistry.drivers.PSI4Driver.hf_method">
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return Hartree-Fock method
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**Return type**
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`str`
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</Attribute>
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### molecule
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<Attribute id="qiskit.chemistry.drivers.PSI4Driver.molecule">
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return molecule
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**Return type**
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`Optional`\[`Molecule`]
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</Attribute>
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### supports\_molecule
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<Attribute id="qiskit.chemistry.drivers.PSI4Driver.supports_molecule">
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True for derived classes that support Molecule.
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**Return type**
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`bool`
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**Returns**
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True if Molecule is supported.
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</Attribute>
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</Class>
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