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            <idno type="halRefHtml">&lt;i&gt;Physical Chemistry Chemical Physics&lt;/i&gt;, 2020, 22 (4), pp.1869 - 1880. &lt;a target="_blank" href="https://dx.doi.org/10.1039/c9cp06501f"&gt;&amp;#x27E8;10.1039/c9cp06501f&amp;#x27E9;&lt;/a&gt;</idno>
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              <p>The Chapman cycle, proposed in 1930, describes the various steps in the ongoing formation and destruction of stratospheric ozone. A key step in the formation process is the stabilization of metastable ozone molecules through collisions with a third body, usually an inert collider such as N 2. The ''ozone isotopic anomaly'' refers to the observation of larger-than-expected atmospheric concentrations for certain ozone isotopologues. Previous studies point to the formation steps as the origin of this effect. A possibly key aspect of the ozone formation dynamics is that of the relative efficiencies of the collisional cooling of different isotopologues. Although the substitution of low-abundance 18 O for 16 O in O 3 molecules corresponds to a relatively small net change in mass, related to this are some subtleties due to symmetry-breaking and a resulting more than doubling of the density of allowed states governed by nuclear-spin statistics for bosons. Recently, a highly accurate 3D potential energy surface (PES) describing O 3-Ar interactions has been constructed and used to benchmark the low-lying rovibrational states of the complex. Here, using this new PES, we have studied the collisional energy-transfer dynamics using the MultiConfiguration Time Dependent Hartree method. A study of the rotationally inelastic scattering was performed for the parent 16 O 16 O 16 OAr system and compared with that of the 16 O 16 O 18 OAr isotopologue. The state-to-state cross-sections and rates from the 0 0,0 initial state to low lying excited states are reported. Analysis of these results yields insight into the interplay between small changes in the rotational constants of O 3 and the reduced mass of the O 3-Ar collision system, combined with that of the symmetry-breaking and introduction of a new denser manifold of allowed states.</p>
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