Single-electron capture in 3-keV/u<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mrow><mml:mi>Ar</mml:mi></mml:mrow><mml:mrow><mml:mn>8</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:math>-He collisions

Zhang, R. T.; Zhu, Xiwen; Li, X. Y.; Liu, L.; Zhang, S. F.; Feng, Wei; Guo, Donghui; Gao, Yuan; Zhao, Dongmei; Wang, J. G.; Ma, Xiaoming

doi:10.1103/physreva.95.042702

Cited by 16 publications

(6 citation statements)

References 35 publications

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“…Figure 3 shows comparisons of the 4l population fractions between the measurements and the results calculated by analytical l distributions, which are the so-called statistical, low-energy, separable, Landau-Zener (LZ), and even distributions. For the present measurements, the relative errors are less than 7% and the measured results are in good agreement with the existing COLTRIMS measurements (Abdallah et al 1998;Zhang et al 2017) and spectroscopic measurements (Druetta et al 1987). Note that the measured fractions show a strong dependence on collision energy, while the results calculated using these l distributions are independent of collision energy.…”

Section: Resultssupporting

confidence: 90%

“…For instance, Beiersdorfer et al (2000) have measured the hardness ratios of the X-ray emissions following CX between 10 bare and hydrogenic ions up to U 91+ and neutrals, and found that the assumptions of the statistical distribution break down at low collision energies. Another significant method is the cold target recoil ion momentum spectroscopy (COLTRIMS) detecting technique (Dörner et al 2000;Ullrich et al 2003), which has advanced the measurement of CX to the point where n- (Ali et al 2010;Xu et al 2021) and l-state selectivity can be resolved (Fisher et al 2002;Zhang et al 2017). However, few measurements are reported particularly for l-resolved capture.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of n- and l-resolved State-selective Charge Exchange in Ar⁸⁺ Collision with He

Ren

Zhang

Wei

et al. 2022

ApJ

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The state-resolved capture cross sections for principal n and orbital angular momentum l play an important role in modeling soft X-ray emissions induced by charge exchange for many astrophysical environments. However, the empirical and semiclassical theories used to produce these data of n- and l-resolved state-selective capture have not been well tested. Using the cold target recoil ion momentum spectroscopy apparatus at Fudan University, we perform a series of measurements of Ar8+ ion charge exchange with He in the collision energy range from 1.4 to 20 keV u−1. We find that electrons are mainly captured in the n = 4 state of Ar7+ ions. This agrees with the prediction of the scaling law for n capture. Moreover, the relative cross sections are reported for 4s-, 4p-, 4d-, and 4f-resolved state-selective capture. The often used analytical l distributions in the astrophysical literature are evaluated by comparing to the measurements.

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Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Measurement of n- and l-resolved State-selective Charge Exchange in Ar⁸⁺ Collision with He

Ren

Zhang

Wei

et al. 2022

ApJ

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“…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

Meng

Gao

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 concept of the contact has been recently extended to the case with the p-wave interaction [56][57][58][59][60][61]. One of the most remarkable difference from the s-wave contact is that in the p-wave case, the contacts consist of 6 components, in principle, because the p-wave interaction consist of three components and each component is characterized by two parameters, the p-wave scattering volume and the effective range.…”

Section: Introductionmentioning

confidence: 99%

Strong-coupling and finite-temperature effects on p -wave contacts

Inotani

Ōhashi

2018

Phys. Rev. A

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We theoretically investigate strong-coupling and finite temperature effects on the p-wave contacts, as well as the asymptotic behavior of the momentum distribution in large momentum region in a one-component Fermi gas with a tunable p-wave interaction. Including p-wave pairing fluctuations within a strong-coupling theory, we calculate the p-wave contacts above the superfluid transition temperature T c from the adiabatic energy relations. We show that while the p-wave contacts related to the scattering volume monotonically increases with increasing the interaction strength, one related to the effective range non-monotonically depends on interaction strength and its sign changes in the intermediate-coupling regime. The non-monotonic interaction dependence of these quantities is shown to originate from the competition between the increase of the cutoff momentum and the decrease of the coupling constant of the p-wave interaction with increasing the effective range. We also analyze the asymptotic form of the momentum distribution in large momentum region. In contrast to the conventional s-wave case, we show that the asymptotic behavior cannot be completely described by only the p-wave contacts, and the extra terms, which is not related to the thermodynamic properties, appear. Furthermore, in high temperature region, we find that the extra terms dominate the sub-leading term of the large-momentum distribution. We also directly compare our results with the recent experimental measurement, by including the effects of a harmonic trap potential within the local density approximation. We show that our model explains the dependence on the interaction strength of the p-wave contacts. Since the p-wave contacts connect the macroscopic properties to the thermodynamic properties of the system, our results would be helpful for further understanding many-body properties of this anisotropic interacting Fermi gas in the normal phase.

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Single-electron capture in 3-keV/uAr8+-He collisions

Cited by 16 publications

References 35 publications

Measurement of n- and l-resolved State-selective Charge Exchange in Ar⁸⁺ Collision with He

Measurement of n- and l-resolved State-selective Charge Exchange in Ar⁸⁺ Collision with He

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

Strong-coupling and finite-temperature effects on p -wave contacts

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Single-electron capture in 3-keV/uAr8+-He collisions

Cited by 16 publications

References 35 publications

Measurement of n- and l-resolved State-selective Charge Exchange in Ar8+ Collision with He

Measurement of n- and l-resolved State-selective Charge Exchange in Ar8+ Collision with He

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

Strong-coupling and finite-temperature effects on p -wave contacts

Contact Info

Product

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Measurement of n- and l-resolved State-selective Charge Exchange in Ar⁸⁺ Collision with He

Measurement of n- and l-resolved State-selective Charge Exchange in Ar⁸⁺ Collision with He

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