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000465265 1001_ $$0P:(DE-HGF)0$$aKilaj, Ardita$$b0$$eFirst author
000465265 245__ $$aConformational and state-specific effects in reactions of 2,3-dibromobutadiene with Coulomb-crystallized calcium ions
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000465265 520__ $$aRecent advances in experimental methodology enabled studies of the quantum-state- and conforma- tional dependence of chemical reactions under precisely controlled conditions in the gas phase. Here, we generated samples of selected gauche and s-trans 2,3-dibromobutadiene (DBB) by electrostatic deflection in a molecular beam and studied their reaction with Coulomb crystals of laser-cooled Ca$^+$ ions in an ion trap. The rate coefficients for the total reaction were found to strongly depend on both the conformation of DBB and the electronic state of Ca$^+$. In the (4p) $^2P_{1/2}$ and (3d) $^2D_{3/2}$ excited states of Ca$^+$, the reaction is capture-limited and faster for the gauche conformer due to long-range ion-dipole interactions. In the (4s) $^2S_{1/2}$ ground state of Ca$^+$, the reaction rate for s-trans DBB still conforms with the capture limit, while that for gauche DBB is strongly suppressed. The exper- imental observations were analysed with the help of adiabatic capture theory, ab-initio calculations, and reactive molecular dynamics simulations on a machine-learned full-dimensional potential en- ergy surface of the system. The theory yields near-quantitative agreement for s-trans-DBB, but overestimates the reactivity of the gauche- conformer compared to the experiment. The present study points to the important role of molecular geometry even in strongly reactive exothermic systems and illustrates striking differences in the reactivity of individual conformers in gas-phase ion-molecule reactions.
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000465265 7001_ $$0P:(DE-HGF)0$$aKäser, Silvan$$b1
000465265 7001_ $$0P:(DE-H253)PIP1084960$$aWang, Jia$$b2
000465265 7001_ $$0P:(DE-HGF)0$$aStranak, Patrik$$b3
000465265 7001_ $$0P:(DE-HGF)0$$aSchwilk, Max$$b4
000465265 7001_ $$0P:(DE-HGF)0$$aXu, Lei$$b5
000465265 7001_ $$0P:(DE-HGF)0$$avon Lilienfeld, O. Anatole$$b6
000465265 7001_ $$0P:(DE-H253)PIP1012175$$aKüpper, Jochen$$b7$$eCorresponding author
000465265 7001_ $$0P:(DE-HGF)0$$aMeuwly, Markus$$b8$$eCorresponding author
000465265 7001_ $$0P:(DE-HGF)0$$aWillitsch, Stefan$$b9$$eCorresponding author
000465265 773__ $$0PERI:(DE-600)1476244-4$$a10.1039/D3CP01416A$$gVol. 25, no. 20, p. 13933 - 13945$$n20$$p13933 - 13945$$tPhysical chemistry, chemical physics$$v25$$x1463-9076$$y2023
000465265 7870_ $$0PUBDB-2024-01157$$aKilaj, Ardita et.al.$$dCambridge : RSC Publ., 2023$$iIsParent$$rarXiv:2303.11813$$tConformational and state-specific effects in reactions of 2,3-dibromobutadiene with Coulomb-crystallized calcium ions
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