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In the present work we explored the mechanisms of the formations of the uracil cyclobutane and oxetane cyclodimers using ab initio methods through excited states and the S 0 –S 1 conical intersections. The excited-state reaction paths showed that the 1 ππ * excited states of the stacked dimers can relax, in a barrierless manner, to the ground states via S 0 ...
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