Preprint Article Version 1 This version not peer reviewed

New Insights into the State Trapping of UV-Excited Thymine

Version 1 : Received: 15 November 2016 / Approved: 15 November 2016 / Online: 15 November 2016 (11:06:06 CET)

A peer-reviewed article of this Preprint also exists.

Stojanović, L.; Bai, S.; Nagesh, J.; Izmaylov, A.F.; Crespo-Otero, R.; Lischka, H.; Barbatti, M. New Insights into the State Trapping of UV-Excited Thymine. Molecules 2016, 21, 1603. Stojanović, L.; Bai, S.; Nagesh, J.; Izmaylov, A.F.; Crespo-Otero, R.; Lischka, H.; Barbatti, M. New Insights into the State Trapping of UV-Excited Thymine. Molecules 2016, 21, 1603.

Journal reference: Molecules 2016, 21, 1603
DOI: 10.3390/molecules21111603

Abstract

After UV excitation, gas phase thymine returns to ground state in 5 to 7 ps, showing multiple time constants. There is no consensus on the assignment of these processes, with a dispute between models claiming that thymine is trapped either in the first (S1) or in the second (S2) excited states. In the present study, nonadiabatic dynamics simulation of thymine is performed on the basis of ADC(2) surfaces, to understand the role of dynamic electron correlation on the deactivation pathways. The results show that trapping in S2 is strongly reduced in comparison to previous simulations considering only non-dynamic electron correlation on CASSCF surfaces. The reason for the difference is traced back to the energetic cost for formation of a CO p bond in S2.

Subject Areas

computational theoretical chemistry; photochemistry; nonadiabatic dynamics; ultrafast processes; surface hopping; nucleobases; thymine

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