Title

Theoretical Photochemistry Of The Photochromic Molecules Based On Density Functional Theory Methods

Keywords

Double excited state; Optical Data Storage; Photochromism; Photoswitching; Rational Materials design; Theoretical Photochemistry; Time Dependent Density Functional Theory; Two-photon Absorption

Abstract

Mechanism of photoswitching in diarylethenes involves the light-initiated symmetry-allowed disrotatory electrocyclic reaction. Here we propose a computationally inexpensive Density Functional Theory (DFT) based method that is able to produce accurate potential surfaces for the excited states. The method includes constrained optimization of the geometry for the ground and two excited singlet states along the ring-closing reaction coordinate using the Slater Transition State method, followed by single-point energy evaluation. The ground state energy is calculated with the broken-symmetry unrestricted Kohn-Sham formalism (UDFT). The first excited state energy is obtained by adding the UDFT ground state energy to the excitation energy of the pure singlet obtained in the linear response Time-Dependent (TD) DFT restricted Kohn-Sham formalism. The excitation energy of the double excited state is calculated using a recently proposed (Mikhailov, I. A.; Tafur, S.; Masunov, A. E. Phys. Rev. A 77, 012510, 2008) a posteriori Tamm-Dancoff approximation to the second order response TD-DFT. © 2009 Springer Berlin Heidelberg.

Publication Date

9-17-2009

Publication Title

Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)

Volume

5545 LNCS

Issue

PART 2

Number of Pages

169-178

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1007/978-3-642-01973-9_19

Socpus ID

70149100884 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/70149100884

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