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<p><b>New page</b></p><div>'''DP'''<ref>[http://www.dp-code.org http://www.dp-code.org]</ref> is a free [[Software package (installation)|software package]] for [[physicist]]s implementing ab initio linear-response TDDFT ([[time-dependent density functional theory]]<ref>{{cite journal | last=Runge | first=Erich | last2=Gross | first2=E. K. U. | title=Density-Functional Theory for Time-Dependent Systems | journal=Physical Review Letters | publisher=American Physical Society (APS) | volume=52 | issue=12 | date=19 March 1984 | issn=0031-9007 | doi=10.1103/physrevlett.52.997 | bibcode=1984PhRvL..52..997R | pages=997–1000}}</ref><ref>{{cite journal | last=Gross | first=E. K. U. | last2=Kohn | first2=Walter | title=Local density-functional theory of frequency-dependent linear response | journal=Physical Review Letters | publisher=American Physical Society (APS) | volume=55 | issue=26 | date=23 December 1985 | issn=0031-9007 | doi=10.1103/physrevlett.55.2850 | pmid=10032255 | bibcode=1985PhRvL..55.2850G | pages=2850–2852}}</ref>) in frequency-reciprocal space and on a [[plane wave]] basis set. <br />
It allows to calculate both dielectric spectra, such as [[EELS]] (electron energy-loss [[spectroscopy]]), IXSS (inelastic X-ray scattering spectroscopy) and CIXS (coherent inelastic X-ray scattering spectroscopy), and also optical spectra, e.g. [[optical absorption]], [[reflectivity]], [[refractive index|refraction index]]. <br />
The systems range from periodic/crystalline [[solid]]s, to surfaces, [[Cluster (physics)|clusters]], [[molecules]] and [[atoms]] made of [[Insulator (electricity)|insulators]], [[semiconductors]] and [[metal]] elements. It implements the RPA ([[random phase approximation]]), the TDLDA or ALDA (adiabatic [[local-density approximation]]) plus other non-local approximations, including or neglecting [[local field|local-field]] effects. It is distributed under the scientific software open-source academic for free license.<br />
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== See also ==<br />
* [[ABINIT]]<br />
* [[EXC code]]<br />
* [[YAMBO code]]<br />
* [[PWscf]]<br />
* [[Quantum chemistry computer programs]]<br />
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== References ==<br />
<references/><br />
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== External links ==<br />
* [http://www.dp-code.org DP code web site]<br />
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[[Category:Physics software]]<br />
[[Category:Computational chemistry software]]<br />
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