Dissociation of NH 3 2+ induced by collision of 300 eV electrons with NH 3
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THE EUROPEAN PHYSICAL JOURNAL D
Regular Article
Dissociation of NH2+ 3 induced by collision of 300 eV electrons with NH3 Long Wei 1,2 , Shanbin Chen1,2 , Yu Zhang3,a , Bo Wang1,2 , Wandong Yu1,2 , Baihui Ren1,2 , Jie Han1,2 , Yaming Zou1,2 , Li Chen1,2 , and Baoren Wei1,2,b 1 2 3
Institute of Modern Physics, Fudan University, Shanghai 200433, P.R. China Key Laboratory of Nuclear Physics and Ion-Beam Application (MOE), Fudan University, Shanghai 200433, P.R. China School of Mathematics, Physics and Information Engineering, Jiaxing University, Jiaxing 314001, P.R. China Received 19 February 2020 / Received in final form 20 May 2020 Published online 25 June 2020 c EDP Sciences / Societ`
a Italiana di Fisica / Springer-Verlag GmbH Germany, part of Springer Nature, 2020 Abstract. The dissociation of ammonia dications induced by 300 eV electron impact has been studied using a cold target recoil-ion momentum spectroscopy. Three regimes were found in the evolution of the produced NH2+ ions, i.e. stable (long-lived), slowly dissociating (metastable), and promptly dissociating. Multiple 3 dissociation channels of NH2+ have been distinguished and identified by ion–ion coincidence technique. 3 + + The kinetic energy release of the deprotonation dissociation channel NH2+ 3 → H + NH2 and the bond2+ + + rearrangement channel NH3 → H2 + NH have been obtained. The dynamic information and complex fragmentation pathways were analyzed by combining Dalitz plot and Newton diagram for the three-body + + + dissociation channel NH2+ 3 → H + NH + H. Strong correlation between the dynamic processes of H , H loss, and the kinetic energy release was found.
1 Introduction Dissociation dynamics of molecules induced by energetic incident projectile impacts have attracted much attention in the past few decades [1]. The cold target recoil-ion momentum spectroscopy (COLTRIMS), which allows one to measure three-dimensional momenta of recoil ions [2,3], has been widely used in various atomic and molecular collision experiments. With the COLTRIMS, from the measured species and momenta of charged fragments, dynamic information on dissociation processes could be reconstructed clearly. Experimental studies on dissociation of polyatomic molecules induced by different incident beams (electron, photon, and highly charged ion) have been performed recently [2–5]. These studies have enriched understanding on collision process, Coulomb explosion, dissociation kinetics, bond-rearrangement, and molecular deformation. As an important nitrogen–hydrogen containing molecule, ammonia molecules are widely present in interstellar medium [6], where interactions with electrons, photons, and multicharged ions may occur. In the space around the earth, the reactive products of ammonia desorption and fragmentation induced by photoelectrons and magnetospheric electrons can further participate and enhance the related secondary chemical process [7,8], in which the a b
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generated molecules or molecular ions then can affec
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