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Zhou J, Belina M, Jia S, Xue X, Hao X, Ren X, Slavíček P. Ultrafast Charge and Proton Transfer in Doubly Ionized Ammonia Dimers. J Phys Chem Lett 2022; 13:10603-10611. [PMID: 36350084 DOI: 10.1021/acs.jpclett.2c02560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
We investigate the ultrafast energy and charge transfer processes between ammonia molecules following ionization reactions initiated by electron impact. Exploring ionization-induced processes in molecular clusters provides us with a detailed insight into the dynamics using experiments in the energy domain. We ionize the ammonia dimer with 200 eV electrons and apply the fragment ions coincident momentum spectroscopy and nonadiabatic molecular dynamics simulations. We identify two mechanisms leading to the doubly charged ammonia dimer. In the first one, a single molecule is ionized. This initiates an ultrafast proton transfer process, leading to the formation of the NH2+ + NH4+ pair. Alternatively, a dimer with a delocalized charge is formed dominantly via the intermolecular Coulombic decay, forming the NH3+·NH3+ dication. This dication further dissociates into two NH3+ cations. The ab initio calculations have reproduced the measured kinetic energy release of the ion pairs and revealed the dynamical processes following the double ionization.
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Affiliation(s)
- Jiaqi Zhou
- School of Physics, Xi'an Jiaotong University, Xi'an710049, China
| | - Michal Belina
- Department of Physical Chemistry, University of Chemistry and Technology,Technická 5, 16628Prague 6, Czech Republic
| | - Shaokui Jia
- School of Physics, Xi'an Jiaotong University, Xi'an710049, China
| | - Xiaorui Xue
- School of Physics, Xi'an Jiaotong University, Xi'an710049, China
| | - Xintai Hao
- School of Physics, Xi'an Jiaotong University, Xi'an710049, China
| | - Xueguang Ren
- School of Physics, Xi'an Jiaotong University, Xi'an710049, China
| | - Petr Slavíček
- Department of Physical Chemistry, University of Chemistry and Technology,Technická 5, 16628Prague 6, Czech Republic
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2
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Ganguly S, Barreiro-Lage D, Walsh N, Oostenrijk B, Sorensen SL, Díaz-Tendero S, Gisselbrecht M. The origin of enhanced [Formula: see text] production from photoionized CO 2 clusters. Commun Chem 2022; 5:16. [PMID: 36697591 PMCID: PMC9814840 DOI: 10.1038/s42004-022-00629-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Accepted: 01/11/2022] [Indexed: 01/28/2023] Open
Abstract
CO2-rich planetary atmospheres are continuously exposed to ionising radiation driving major photochemical processes. In the Martian atmosphere, CO2 clusters are predicted to exist at high altitudes motivating a deeper understanding of their photochemistry. In this joint experimental-theoretical study, we investigate the photoreactions of CO2 clusters (≤2 nm) induced by soft X-ray ionisation. We observe dramatically enhanced production of [Formula: see text] from photoionized CO2 clusters compared to the case of the isolated molecule and identify two relevant reactions. Using quantum chemistry calculations and multi-coincidence mass spectrometry, we pinpoint the origin of this enhancement: A size-dependent structural transition of the clusters from a covalently bonded arrangement to a weakly bonded polyhedral geometry that activates an exothermic reaction producing [Formula: see text]. Our results unambiguously demonstrate that the photochemistry of small clusters/particles will likely have a strong influence on the ion balance in atmospheres.
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Affiliation(s)
- Smita Ganguly
- Department of Physics, Lund University, Box 118, SE-221 00 Lund, Sweden
| | - Dario Barreiro-Lage
- Departamento de Química - Módulo 13, Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Noelle Walsh
- MAXIV laboratory, Lund University, Box 118, SE-221 00 Lund, Sweden
| | - Bart Oostenrijk
- Department of Physics, Lund University, Box 118, SE-221 00 Lund, Sweden
| | | | - Sergio Díaz-Tendero
- Departamento de Química - Módulo 13, Universidad Autónoma de Madrid, 28049 Madrid, Spain
- Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, 28049 Madrid, Spain
- Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, 28049 Madrid, Spain
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3
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Zhu X, Hu X, Yan S, Peng Y, Feng W, Guo D, Gao Y, Zhang S, Cassimi A, Xu J, Zhao D, Dong D, Hai B, Wu Y, Wang J, Ma X. Heavy N + ion transfer in doubly charged N 2Ar van der Waals cluster. Nat Commun 2020; 11:2987. [PMID: 32533002 PMCID: PMC7293282 DOI: 10.1038/s41467-020-16749-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Accepted: 05/20/2020] [Indexed: 11/30/2022] Open
Abstract
Van der Waals clusters are weakly bound atomic/molecular systems and are an important medium for understanding micro-environmental chemical phenomena in bio-systems. The presence of neighboring atoms may open channels otherwise forbidden in isolated atoms/molecules. In hydrogen-bond clusters, proton transfer plays a crucial role, which involves mass and charge migration over large distances within the cluster and results in its fragmentation. Here we report an exotic transfer channel involving a heavy N+ ion observed in a doubly charged cluster produced by 1 MeV Ne8+ ions: (N2Ar)2+→N++NAr+. The neighboring Ar atom decreases the \documentclass[12pt]{minimal}
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\begin{document}$${\mathrm{N}}_2^{2 + }$$\end{document}N22+ barrier height and width, resulting in significant shorter lifetimes of the metastable molecular ion state \documentclass[12pt]{minimal}
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\begin{document}$${\mathrm{N}}_2^{2 + }$$\end{document}N22+(\documentclass[12pt]{minimal}
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\begin{document}$${{\mathrm{X}}^{1}}{\Sigma _{{\mathrm{g}}}^{+}}$$\end{document}X1Σg+). Consequently, the breakup of the covalent N+−N+ bond, the tunneling out of the N+ ion from the \documentclass[12pt]{minimal}
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\begin{document}$${\mathrm{N}}_2^{2 + }$$\end{document}N22+ potential well, as well as the formation of an N−Ar+ bound system take place almost simultaneously, resulting in a Coulomb explosion of N+ and NAr+ ion pairs. There are multiple ways by which energy and charge transfer occur in weakly bound systems. Here the authors reveal a heavy ion N+ transfer in a doubly charged Van der Waals cluster produced in collisions of the highly charged Ne8+ ion with N2Ar, leading to fragmentation of N+ and NAr+ via Coulomb explosion.
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Affiliation(s)
- XiaoLong Zhu
- Institute of Modern Physics, Chinese Academy of Sciences, 730000, Lanzhou, China.,University of Chinese Academy of Sciences, 100049, Beijing, China
| | - XiaoQing Hu
- Institute of Applied Physics and Computational Mathematics, 100088, Beijing, China
| | - ShunCheng Yan
- Institute of Modern Physics, Chinese Academy of Sciences, 730000, Lanzhou, China.,University of Chinese Academy of Sciences, 100049, Beijing, China
| | - YiGeng Peng
- Institute of Applied Physics and Computational Mathematics, 100088, Beijing, China
| | - WenTian Feng
- Institute of Modern Physics, Chinese Academy of Sciences, 730000, Lanzhou, China
| | - DaLong Guo
- Institute of Modern Physics, Chinese Academy of Sciences, 730000, Lanzhou, China.,University of Chinese Academy of Sciences, 100049, Beijing, China
| | - Yong Gao
- Institute of Modern Physics, Chinese Academy of Sciences, 730000, Lanzhou, China
| | - ShaoFeng Zhang
- Institute of Modern Physics, Chinese Academy of Sciences, 730000, Lanzhou, China.,University of Chinese Academy of Sciences, 100049, Beijing, China
| | - Amine Cassimi
- CIMAP, CEA/CNRS/ENSICAEN/UNICAEN, BP5133, 14070, Caen, France
| | - JiaWei Xu
- Institute of Modern Physics, Chinese Academy of Sciences, 730000, Lanzhou, China.,University of Chinese Academy of Sciences, 100049, Beijing, China
| | - DongMei Zhao
- Institute of Modern Physics, Chinese Academy of Sciences, 730000, Lanzhou, China
| | - DaPu Dong
- Institute of Modern Physics, Chinese Academy of Sciences, 730000, Lanzhou, China.,University of Chinese Academy of Sciences, 100049, Beijing, China
| | - Bang Hai
- Institute of Modern Physics, Chinese Academy of Sciences, 730000, Lanzhou, China.,University of Chinese Academy of Sciences, 100049, Beijing, China
| | - Yong Wu
- Institute of Applied Physics and Computational Mathematics, 100088, Beijing, China. .,HEDPS, Center of Applied Physics and Technology, Peking University, 100871, Beijing, China.
| | - JianGuo Wang
- Institute of Applied Physics and Computational Mathematics, 100088, Beijing, China
| | - X Ma
- Institute of Modern Physics, Chinese Academy of Sciences, 730000, Lanzhou, China. .,University of Chinese Academy of Sciences, 100049, Beijing, China.
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4
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Tachikawa H. Intramolecular Reactions in Ionized Ammonia Clusters: A Direct Ab Initio Molecular Dynamics Study. J Phys Chem A 2020; 124:1903-1910. [PMID: 32049527 DOI: 10.1021/acs.jpca.9b11122] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Ammonia cluster cations are a chemical species that has recently attracted considerable research attention as an ion-molecule reaction species in the planetary atmosphere, surface reaction species in materials chemistry, and super-alkali species. Reactions of the radical cation of an ammonia cluster, [(NH3)n]+ (n = 2-6), following the ionization of the parent neutral cluster, were investigated using direct ab initio molecular dynamics to elucidate the reactions of the ammonia cluster cation under astrochemical conditions. The calculations showed that two competing reaction channels-proton transfer (PT) channel and complex formation channel-operate after the ionization of neutral clusters. In the PT channel, a proton of NH3+ was transferred to a neighboring ammonia molecule. The PT channel was found in all clusters (n = 2-6). Reaction via the PT channel became faster with increasing cluster size and saturated around n = 5-6. In the complex formation channel, a face-to-face complex having a H3N-NH3+ structure (with a N-N bond) was formed. This channel was found only in larger clusters (n = 5-6). Time scales of PT and complex formation channels were calculated to be 20-30 and 40-50 fs, respectively. The reaction mechanism was discussed based on the results of theoretical calculations.
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Affiliation(s)
- Hiroto Tachikawa
- Division of Applied Chemistry, Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan
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5
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Oostenrijk B, Barreiro D, Walsh N, Sankari A, Månsson EP, Maclot S, Sorensen SL, Díaz-Tendero S, Gisselbrecht M. Fission of charged nano-hydrated ammonia clusters – microscopic insights into the nucleation processes. Phys Chem Chem Phys 2019; 21:25749-25762. [DOI: 10.1039/c9cp04221k] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The dynamics of nucleation and fission in atmospheric aerosols is tackled in a joint experimental–theoretical study using a model system that consists of hydrogen-bonded ammonia and water molecules.
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Affiliation(s)
| | - Darío Barreiro
- Departamento de Química
- Módulo 13
- Universidad Autónoma de Madrid
- 28049 Madrid
- Spain
| | - Noelle Walsh
- Department of Physics
- Lund University
- 22100 Lund
- Sweden
| | - Anna Sankari
- Department of Physics
- Lund University
- 22100 Lund
- Sweden
| | - Erik P. Månsson
- Attosecond Science Group
- DESY Photon Science Division
- Schenefeld
- Germany
| | - Sylvain Maclot
- Department of Physics
- Lund University
- 22100 Lund
- Sweden
- Biomedical and X-ray Physics
| | | | - Sergio Díaz-Tendero
- Departamento de Química
- Módulo 13
- Universidad Autónoma de Madrid
- 28049 Madrid
- Spain
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