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paper_UAR.tex

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 \begin{abstract}
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 A series of dynamics collision simulations between lowest-energy uracil protonated water clusters (H$_2$O)$_{n=3-7, 12}$UH$^+$ and Argon atom were performed with the self-consistent-charge density-functional based tight-binding {\bf remove acronyles in abvstract if not necessary ) : (SCC-DFTB)}  method to make a deep exploration of the collision process. From the dynamics collision simulations, the trend of different types of fragments and location of the excess proton were observed. {\bf MR  : remove the following sentence, details : Our initial geometries provided a reasonably uniform distribution of Argon projectiles around each uracil protonated water clusters leading Argon atom can collide at all the possible positions of each cluster. } The theoretical simulation data show that the proportion of neutral uracil molecule loss and total fragmentation cross sections are consistent with those in experiment. Additionally, we observed that up to 7 water molecules the clusters had a direct dissociation mechanism after collision \blue{whereas for 12 water molecules …...} Furthermore, the calculation results indicate the excess proton location is highly dependent on the initial isomer as stated in a previous study {\bf put a reference in full text}  \blue{By conducting path-integral MD simulation, we finally observed that nuclear quantum effect XXX.} \blue{We are the first to perform this kind of simulation,} our dynamics collision simulations for predicting the type and amount of fragments and fragmentation cross sections of collision system provide a useful tool. 
 \end{abstract}