Ar16+和Ar17+离子与Zr作用产生的X射线谱

将超导离子源提供的10—20keV/q Ar¹⁶⁺和Ar¹⁷⁺离子入射到Zr金属表面,在相互作用中产生的X射线谱表明,高电荷态Ar¹⁶⁺离子在金属表面中性化过程中有可能存在多电子激发,使Ar¹⁶⁺的K壳层电子被激发形成空穴,在退激过程中发射特征Kα-X射线.空心原子Ar的K层发射X射线强度随入射离子的动能而减弱,靶原子Zr的L壳层发射X射线强度随入射离子动能的增加而增强.Ar¹⁷⁺的单离子的Kα- 关键词： 高电荷态离子 空心原子 X射线     

Ar16+和Ar17+离子与Zr作用产生的X射线谱

将超导离子源提供的10-20keV/q Ar16 和Ar17 离子入射到Zr金属表面,在相互作用中产生的X射线谱表明,高电荷态Ar16 离子在金属表面中性化过程中有可能存在多电子激发,使Ar16 的K壳层电子被激发形成空穴,在退激过程中发射特征Kα-X射线.空心原子Ar的K层发射X射线强度随入射离子的动能而减弱,靶原子Zr的L壳层发射X射线强度随入射离子动能的增加而增强.Ar17 的单离子的Kα-X射线产额比Ar16 单离子的Kα-X射线产额大5个数量级.     

高电荷态离子Arq+与不同金属靶作用产生的X射线

研究了高电荷态离子Ar^q+(q=16，17，18)入射金属Be，Al，Ni，Mo，Au靶表面产生的X射线谱.实验结果表明，Ar的Kα-X射线是离子在与固体表面相互作用过程中固体表面之下形成空心原子发射的.电子组态1s²的高电荷态Ar¹⁶⁺离子在金属表面中性化过程中，存在的多电子激发过程使Ar¹⁶⁺的K壳层电子激发产生空穴，级联退激发射Ar的Kα 特征X射线.Ar¹⁷⁺离子在金属表面作用过程中产生的X射线谱形与靶材料没有明显的关联,入射离子的Kα-X射线产额与其最初的电子组态有关，靶原子的X射线产额与入射离子的动能有关. 关键词： 高电荷态离子 空心原子 多电子激发 X射线     

高电荷态离子Ar17+与Mo表面作用过程中的X射线发射

观测了低速(小于Bohr速度)高电荷Ar¹⁷⁺离子与金属Mo表面相互作用的X射线发射,以及ArKα,KβX射线强度随入射离子动能的变化.     

Oq+低能高电荷态离子与Al表面作用产生的X射线

报道了1.5—20 keV/q的高电荷态Oq+(q=3—7)离子与Al表面相互作用发射的O原子的特征X射线谱.分析表明,对于Oq+(q=3—6)离子入射时发射的X射线,是由于离子进入表面后与Al原子发生紧密碰撞导致的;而O7+离子入射时的X射线,主要来自于空心原子的衰变.在动能相等的条件下,存在K壳层空穴的O7+离...     

高电荷态离子Arq+与不同金属靶作用产生的X射线

研究了高电荷态离子Arq+(q=16,17,18)入射金属Be,Al,Ni,Mo,Au靶表面产生的X射线谱.实验结果表明,Ar的Kα-X射线是离子在与固体表面相互作用过程中固体表面之下形成空心原子发射的.电子组态1s2的高电荷态Ar16+离子在金属表面中性化过程中,存在的多电子激发过程使Ar16+的K壳层电子激发产生空穴,级联退激发射Ar的Kα特征X射线.Ar17+离子在金属表面作用过程中产生的X射线谱形与靶材料没有明显的关联,入射离子的Kα-X射线产额与其最初的电子组态有关,靶原子的X射线产额与入射离子的动能有关.     

高电荷态离子129Xe29+与不同金属表面作用产生的X射线谱

研究了高电荷态离子129Xe29+入射金属Au、Mo、Be表面产生的特征X射线谱。实验结果表明,在入射离子的动能相同时,Au的Mα1-X射线产额比Mo的Lα1-X、Lα2-X、Lβ 1-X射线总产额高,特征X射线的产额随入射离子动能的增加而显著增加;不同动能的Xe29+入射金属Au、Mo、Be表面均未产生Xe的特征X射线。     

高电荷态离子129Xe28+与Au和Mo表面作用产生的X射线谱

研究了高电荷态离子129Xe28+轰击金属Au和Mo表面产生的特征X射线谱.实验结果表明,在入射离子的电荷态和能量相同的条件下,对于核电荷数较小、原子质量较轻的靶原子,只有其内壳层的电子才能被激发而产生X射线,而核电荷数较大、原子质量较重的靶原子只有其较外壳层的电子能被激发而产生X射线.特征X射线的产额随入射离子动能的增加而增加.     

H+和Ar11+激发Si的K壳层X射线发射研究

测量了50–250 keV H⁺和1.0–3.0 MeV Ar¹¹⁺ 轰击Si表面过程中辐射的X射线. 结果表明, 在Ar¹¹⁺入射的情况下, 引起了Si的L壳层上3, 4个电子的多电离.计算了Si的K壳层X射线产生截面, 并将两体碰撞近似(BEA), 平面波恩近似, ECPSSR理论计算与实验值进行了对比. ECPSSR理论与质子产生的截面数据能够很好地符合; 而考虑多电离后, BEA理论与Ar¹¹⁺的实验结果符合较好. 关键词： X射线 高电荷态重离子 多电离     

近Bohr速度的152Eu20+入射Au表面产生的X射线谱

测量了动能为2.0–6.0 MeV的高电荷态离子¹⁵²Eu²⁰⁺ 入射Au表面产生的特征X射线谱, 结果表明, 相互作用不仅激发出了Au的 M_ζ, M_α和M_δ特征X射线, 还激发出了Eu的M_α X射线, 且X射线总产额随入射离子动能的增加而增加. 计算了Au的M壳层总的X射线产生截面, 并与理论模型的计算结果做了比较分析. 关键词： 高电荷态离子 X射线 产额 截面     

Ar+17和 Ar+16谱线的电子碰撞展宽

利用修改后伦敦理工大学的UCL扭曲波程序, 本文计算了自由电子与原子或离子的碰撞反应矩阵, 以此得到它的散射矩阵和碰撞强度.利用碰撞强度, 研究电子碰撞对辐射谱线影响.具体地, 以Ar⁺¹⁷和Ar⁺¹⁶的α线和β线为例, 计算了不同电子温度和密度下谱线的展宽和位移.     

Argon L-shell Auger spectra produced in Ar+ -Ar collisions

Argon L-shell Auger spectra were measured by 100 to 550 keV Ar⁺ impact on Ar. Observed line structure in the spectra are interpreted both by multiple outer-shell ionization and Doppler effects.     

X-ray spectra induced by slow highly charged Ar q + ions in collision with Nb surface

The X-ray spectra of Nb surface induced by Ar ^q+ (q = 16,17) ions with the energy range from 10 to 20 keV/q were studied by the optical spectrum technology. The experimental results indicate that the multi-electron excitation occurred as a highly charged Ar¹⁶⁺ ion was neutralized below the metal surface. The K shell electron of Ar¹⁶⁺ was excited and then de-excited cascadly to emit K X-ray. The intensity of the X-ray emitted from K shell of the hollow Ar atom decreased with the increase of projectile kinetic energy. The intensity of the X-ray emitted from L shell of the target atom Nb increased with the increase of projectile kinetic energy. The X-ray yield of Ar¹⁷⁺ is three magnitude orders larger than that of Ar¹⁶⁺. Supported by the National Natural Science Foundation of China (Grant Nos.10774149 and 10405025)     

X-ray photoelectron spectroscopic studies of PbO surfaces bombarded with He+, Ne+, Ar+, Xe+ and Kr+

The surface composition of PbO has been studied with X-ray photoelectron spectroscopy after bombardment with several inert gas ions of 400 eV. The results show reduction of PbO to metallic Pb with the degree of damage following the order He⁺ > Ne⁺ >Ar⁺. Both Kr⁺ and Xe⁺ did not reduce the oxide. The depth of damage varied from ≈9 Å for He⁺ to ≈1 Å for Ar⁺ bombardment. The results were compared to a collisional and a thermal model of the sputtering process.     

Radiation damage of material surfaces under prolonged irradiation with He+ and Ar+ ions with broad energy spectra

The results of studying the redistribution of Be, Al, Ti, Fe, Cu, Zr, Mo, and W atoms incorporated in polycrystalline metal samples under irradiation with He⁺, (He⁺ + Ar⁺), and Ar⁺ ion beams with a broad energy spectrum and an average energy of 10 keV at irradiation doses of 1 × 10²¹ ion/cm² are studied. It is discovered that irradiation at doses exceeding 1 × 10¹⁹ ion/cm² results in local small-crystal formations being produced in a near-surface substrate layer. Their typical dimensions are less than 1–5 μm, and their the density is up to 1–100. They contain incorporated atoms and impurity atoms with a concentration of 0.1–10 at %. Subsequent irradiation at a dose of 1 × 10²⁰ ions/cm² or more leads to disappearance of these formations, mainly because of sputtering processes.     

Wear resistance of the ion-modified surface of zirconium-alloy tubes irradiated by He+ and Ar+ ion beams with wide energy spectra

The results of investigating the wear resistance of E110 alloy samples irradiated by a He⁺ + Ar⁺ beam with a wide energy spectrum are presented. Surface modification under irradiation by an Ar⁺ beam at doses higher than 2 × 10¹⁸ ion/cm² is shown to cause substantial enhancement of the wear resistance of samples because the structural homogeneity of near surface layers increases, the surface roughness decreases, and its microhardness increases. The application of a mechanical-geometrical wear model based on the experimental wear characteristics determined during accelerated tests indicates that the thinning of an alloy cladding can reach rates of 10⁻⁶–10⁻³ mm/s, which agree satisfactorily with data obtained in other simulation experiments. The presence of an oxide film changes a wear process characterized by an abrasive component.