Electron emission from single-electron capture with simultaneous single-ionization reactions in 30-keV/u He<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>2</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>-on-argon collisions

Ma, Xinwen; Zhang, R. T.; Zhang, S. F.; Zhu, Xiaolong; Feng, Wei; Guo, Donghui; Li, B.; Liu, H. P.; Li, C. Y.; Wang, J. G.; Yan, Song; Zhang, P. J.; Wang, Q.

doi:10.1103/physreva.83.052707

“…Experiments on CX between O 6+ and He and H 2 were performed with the COLTRIMS apparatus mounted on the 320 kV high-voltage platform for multidisciplinary research with HCIs at the Institute of Modern Physics, Chinese Academy of Sciences (IMP-CAS), shown in Figure 1. The working principles of COLTRIMS have been described in detail elsewhere (Dörner et al 2000;Ullrich et al 2003;Ma et al 2011;Zhang et al 2016Zhang et al , 2017Guo et al 2021).…”

Section: Methodsmentioning

confidence: 99%

State-selective Charge Exchange in 19.5–100 keV amu⁻¹ O⁶⁺ Collision with He and H₂

Cao

¹

,

Meng

²

,

Gao

³

et al. 2023

ApJS

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The cross sections of state-selective charge exchange (CX) between highly charged ions and neutrals are important for modeling extreme ultraviolet and soft X-ray emissions in many astrophysical objects with hot plasma impacting cold media. By using cold-target recoil-ion momentum spectroscopy, we measure O6+ CX collisions with He and H2 in the collision energy range of 19.5 to 100 keV amu−1. The relative cross sections of state-selective single CX are reported for electron capture into O5+(1s 2 nl) n = 2, 3, 4, 5, ≥6 and n = 3, 4, 5, ≥6 for He and H2, respectively. With the collision energy increasing to 100 keV amu−1, the main capture channel shifts to higher n for both target species as compared to available theoretical results. We also report state-selective cross sections for double CX with He, where doubly excited states of O 4 + ( 1 s 2 nln ′ l ′ ) with nln ′ l ′ being 2s 2 (1S), 2s2p (1P), 2p 2 (1D), and 2p 2 (1S) [symmetric configurations] and 2s3l, 2p3l−2s4l, and 2s5l−2p5l [asymmetric configurations] are distinguished. It is found that the contributions of doubly excited states with asymmetric configurations are dominant and symmetric configurations increasingly come into play with the increase of collision energy. The present results provide experimental benchmarks available for theoretical calculations.

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“…The details of the transverse COLTRIMS have been described elsewhere (Ma et al 2008(Ma et al , 2011Guo et al 2012).…”

Section: Experimental Methodsmentioning

confidence: 99%

“…In the present experiment, the recoil ions He + and He 2+ were recorded in coincidence with the scattered projectiles C 3+ and C 2+ , respectively. The events for SEC and DEC can be identified in the two-dimensional spectrum of time of flight of the recoil ions versus the scattered ion position (Ma et al 2011). The momentum conservation condition was used for the background suppression.…”

Section: Experimental Methodsmentioning

confidence: 99%

Benchmark n ℓ-resolved Cross Sections of Single and Double Charge Exchange Processes in 1.67–20 keV u⁻¹ C⁴⁺ Collisions with He

Guo

¹

,

Zhang

²

,

Zhu

³

et al. 2022

ApJ

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State-resolved charge exchange (CX) cross sections are of the utmost importance for modeling related photon emissions existing in a broad range of astrophysical environments. With the cold-target recoil-ion momentum spectroscopy, we determined with high accuracy the state-resolved single and double CX cross sections at the quantum orbital angular momentum level for solar wind ion C4+ collisions with He in an energy range of 1.67–20 keV u−1, which allow one to benchmark the CX calculations in great detail, and to test the applicability of the analytical n- and ℓ-distribution models widely adopted by the astrophysical community. We found that the present measurements are well reproduced by the most recent state-of-the-art atomic–orbital close-coupling calculations. However, the CX models failed to give a consistent description on the measured ℓ distributions. The present work reveals that the velocity and collision partner species dependence effects as well as electronic correlations for multielectron processes should be included in an improved model. Alternatively, in future modeling to interpret high-resolution astrophysical observations the more elaborate quantum-mechanical calculations may be resorted to with confidence.

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“…Our experiment was conducted at 320 kV platform for multidisciplinary research with highly charged ions in the Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 41 . A standard Cold Target Recoil Ion Momentum Spectroscopy/Reaction Microscope was employed to determine the momentum of each fragments in coincidence [41][42][43] . The highly charged Ne 8+ ions were produced by the permanent magnet electron cyclotron resonance ion source and were accelerated to an energy of 1 MeV.…”

Section: Methodsmentioning

confidence: 99%

Heavy N+ ion transfer in doubly charged N2Ar van der Waals cluster

Zhu

¹

,

Hu

²

,

Yan

³

et al. 2020

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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 Ne 8+ ions: (N 2 Ar) 2+ →N + +NAr +. The neighboring Ar atom decreases the N 2þ 2 barrier height and width, resulting in significant shorter lifetimes of the metastable molecular ion state N 2þ 2 (X 1 Σ þ g). Consequently, the breakup of the covalent N + −N + bond, the tunneling out of the N + ion from the N 2þ 2 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.

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Electron emission from single-electron capture with simultaneous single-ionization reactions in 30-keV/u He2+-on-argon collisions

Cited by 65 publications

References 30 publications

State-selective Charge Exchange in 19.5–100 keV amu⁻¹ O⁶⁺ Collision with He and H₂

State-selective Charge Exchange in 19.5–100 keV amu⁻¹ O⁶⁺ Collision with He and H₂

Benchmark n ℓ-resolved Cross Sections of Single and Double Charge Exchange Processes in 1.67–20 keV u⁻¹ C⁴⁺ Collisions with He

Heavy N+ ion transfer in doubly charged N2Ar van der Waals cluster

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Electron emission from single-electron capture with simultaneous single-ionization reactions in 30-keV/u He2+-on-argon collisions

Cited by 65 publications

References 30 publications

State-selective Charge Exchange in 19.5–100 keV amu−1 O6+ Collision with He and H2

State-selective Charge Exchange in 19.5–100 keV amu−1 O6+ Collision with He and H2

Benchmark n ℓ-resolved Cross Sections of Single and Double Charge Exchange Processes in 1.67–20 keV u−1 C4+ Collisions with He

Heavy N+ ion transfer in doubly charged N2Ar van der Waals cluster

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State-selective Charge Exchange in 19.5–100 keV amu⁻¹ O⁶⁺ Collision with He and H₂

State-selective Charge Exchange in 19.5–100 keV amu⁻¹ O⁶⁺ Collision with He and H₂

Benchmark n ℓ-resolved Cross Sections of Single and Double Charge Exchange Processes in 1.67–20 keV u⁻¹ C⁴⁺ Collisions with He