Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 190, Issue 2-3, Pages 228-240Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2006.12.008
Keywords
nonadiabatic phenomena; excited state dynamics; ultrafast photochemistry; on-the-fly surface-hopping dynamics; Ab initio dynamics
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The great importance of ultrafast phenomena in photochemistry and photobiology has made dynamics simulations an essential methodology in these areas. In this work, we present the NEWTON-X program package containing a new implementation of a direct dynamics approach to perform adiabatic (Born-Oppenheimer) and nonadiabatic Simulations. The nonadiabatic dynamics is based on Tully's surface hopping approach. The program has been developed with the aim of (1) to create a flexible tool to be used in connection with a multitude of third-party electronic-structure program packages and (2) to provide the most common options for excited-state dynamics simulations. Benchmark calculations on the nonadiabatic dynamics are presented for the methaniminium, butatriene and pentadieniminium cations. The simulation of UV absorption spectra is presented for the methaniminium cation and pyrazine. (c) 2006 Elsevier B.V. All rights reserved.
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