A cold target recoil-ion momentum spectroscopy for the investigation on the dynamics of atomic and molecular reactions in Shanghai

Zhang, Y.; Wang, X.; Lu, Dawei; Wei, Bingchen; Zhang, B.H.; Tang, Yongjian; Hutton, R.; Zou, Yu

doi:10.1016/j.nimb.2014.07.023

Cited by 16 publications

(9 citation statements)

References 57 publications

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“…The experiments on the CX between Ar 8+ and He were carried out with the COLTRIMS apparatus mounted on a 150 kV high-voltage platform at Fudan University (Zhang et al 2014;Ren et al 2021). Briefly, Ar 8+ ions produced in an electron cyclotron resonance ion source were first extracted, accelerated to the desired energy, and then magnetically analyzed.…”

Section: Experiments Setupmentioning

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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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: Experiments Setupmentioning

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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“…The setup has been described in detail in a previous work. 33 Briefly, a beam of cold ethane molecules formed in a supersonic gas jet perpendicularly collided with a 300 eV electron beam produced from a thermo-cathode electron gun. After the collision interaction, recoil ions were extracted by the uniform electrostatic field (10 cm long) in the time-of-flight (TOF) spectrometer with a field strength of 60 V/cm, then passed through the field free drift tube (20 cm long), and finally hit the position-and timesensitive detector (PSD, 7.5 cm in diameter) consisting of two microchannel plates and a delay-line anode readout.…”

Section: ■ Methodsmentioning

confidence: 99%

“…The electron impact experiment was carried out utilizing the COLTRIMS setup at Fudan University. The setup has been described in detail in a previous work . Briefly, a beam of cold ethane molecules formed in a supersonic gas jet perpendicularly collided with a 300 eV electron beam produced from a thermo-cathode electron gun.…”

Section: Methodsmentioning

confidence: 99%

Isomerization Dynamics in the Symmetric and Asymmetric Fragmentation of Ethane Dications

Wei

Lam

Zhang

et al. 2021

J. Phys. Chem. Lett.

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Hydrogen- or proton-migration-induced isomerization has recently been of concern for its critical role in the dissociation of organic molecules of astrophysical or biological relevance. Herein we present a combined experimental and theoretical study of the two-body C–C bond breakdown dissociation of ethane dication. For the asymmetric fragmentation channel CH2 + + CH4 +, the kinetic energy release measurements and ab initio quantum chemical calculations demonstrate that the reaction pathway involving hydrogen-migration-induced isomerization of [CH3–CH3]2+ to [CH2–CH4]2+ can be accessed via the lowest triplet state rather than the ground singlet state of ethane dication. Interestingly, it is found that a considerable proportion of the yield of symmetric fragmentation CH3 + + CH3 +, which is usually considered from a direct Coulomb explosion and seemingly independent of isomerization, could come from the dissociation of ethane dication in the ground singlet state with the involvement of [CH3–CH3]2+ isomerization to intermediate [H2C(H2)CH2]2+ of the diborane-like double-bridged structure.

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“…However, if the extraction voltage is too low, charged products may not be captured by the TOF, making momentum resolution an experimental trade-off with detection efficiency. Typical momentum resolutions for ions range between 0.1 and 0.35 atomic units depending on experimental conditions [85][86][87] . Reductions in dead time by incorporating delay-line detectors increased the data taking frequency to MHz [88] .…”

Section: Detection Devicesmentioning

confidence: 99%

Metastable noble gas atoms in strong-field ionization experiments

Calvert

Palmer

Litvinyuk

et al. 2016

High Pow Laser Sci Eng

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The interactions of strong-field few-cycle laser pulses with metastable states of noble gas atoms are examined. Metastable noble gas atoms offer a combination of low ionization potential and a relatively simple atomic structure, making them excellent targets for examining ionization dynamics in varying experimental conditions. A review of the current work performed on metastable noble gas atoms is presented.

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A cold target recoil-ion momentum spectroscopy for the investigation on the dynamics of atomic and molecular reactions in Shanghai

Cited by 16 publications

References 57 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

Isomerization Dynamics in the Symmetric and Asymmetric Fragmentation of Ethane Dications

Metastable noble gas atoms in strong-field ionization experiments

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A cold target recoil-ion momentum spectroscopy for the investigation on the dynamics of atomic and molecular reactions in Shanghai

Cited by 16 publications

References 57 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

Isomerization Dynamics in the Symmetric and Asymmetric Fragmentation of Ethane Dications

Metastable noble gas atoms in strong-field ionization experiments

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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