Novel method for unambiguous ion identification in mixed ion beams extracted from an electron beam ion trap

Meissl, W.; Simon, M. C.; López‐Urrutia, J. R. Crespo; Tawara, H.; Ullrich, J.; Winter, H.; Aumayr, F.

doi:10.1063/1.2238856

Cited by 7 publications

(3 citation statements)

References 15 publications

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“…Impacting on insulating materials, slow HCIs may induce the formation of stable hillock-or crater-type nanostructures [3,4,10,11]. While the emission of a large number of electrons allows for detection of each ion impact with unit efficiency and therefore single ion hit monitoring [12], the morphology and size of the resulting material modification can be tuned by the charge state of the incoming highly charged ion [13]. The main challenge remaining is to control the ion impact point as precisely as possible.…”

Section: Introductionmentioning

confidence: 99%

Temperature control of ion guiding through insulating capillaries

et al. 2012

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Guiding of highly charged ions through tilted capillaries promises to develop into a tool to efficiently collimate and focus low-energy ion beams to sub-micrometer spot size. One control parameter to optimize guiding is the residual electrical conductivity of the insulating material. Its strong, nearly exponential temperature dependence is the key to transmission control and can be used to suppress transmission instabilities arising from flux fluctuations of incident ions which otherwise would lead to Coulomb blocking of the capillary. We demonstrate the strong dependence of transmission of Ar 7+ ions through a single macroscopic glass capillary on temperature and ion flux. Results in the regime of dynamical equilibrium can be described by balance equations in the linear-response regime.

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Section: Introductionmentioning

confidence: 99%

Temperature control of ion guiding through insulating capillaries

et al. 2012

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“…5 This type of ions is now readily available after recent developments in ion source technology leading to powerful ion sources such as the electron-beam ion trap ͑EBIT͒. 6,7 While electronic energy loss of swift heavy ions is the major cause of material modifications, 8,9 potential-energy deposition is dominating surface modifications by HCI. 10 During interaction with the solid surface HCI deposit their potential energy ͑the total ionization energy required for producing the high charge state from its neutral ground state͒ within a few femtosecond in a nanometer-sized volume close to the surface.…”

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Pyramidal pits created by single highly charged ions inBaF2single crystals

et al. 2010

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In various insulators, the impact of individual slow highly charged ions ͑eV-keV͒ creates surface nanostructures, whose size depends on the deposited potential energy. Here we report on the damage created on a cleaved BaF 2 ͑111͒ surface by irradiation with 4.5ϫ q keV highly charged xenon ions from a roomtemperature electron-beam ion trap. Up to charge states q = 36, no surface topographic changes on the BaF 2 surface are observed by scanning force microscopy. The hidden stored damage, however, can be made visible using the technique of selective chemical etching. Each individual ion impact develops into a pyramidal etch pits, as can be concluded from a comparison of the areal density of observed etch pits with the applied ion fluence ͑typically 10 8 ions/ cm 2 ͒. The dimensional analysis of the measured pits reveals the significance of the deposited potential energy in the creation of lattice distortions/defects in BaF 2 .Swift heavy ions ͑MeV-GeV kinetic energy͒ have become an important tool for structural modifications of various materials at the microscale and nanoscale for a wide range of applications in the last two decades. 1-4 One major limitation of using these high-energy ions is the damage creation in deep layers which in some applications should be avoided. The desire to confine the damage to the first few layers, which is essential for applications such as ion projection lithography, has stimulated the interest for the use of slow ͑eV-keV͒ highly charged ions ͑HCIs͒. 5 This type of ions is now readily available after recent developments in ion source technology leading to powerful ion sources such as the electron-beam ion trap ͑EBIT͒. 6,7 While electronic energy loss of swift heavy ions is the major cause of material modifications, 8,9 potential-energy deposition is dominating surface modifications by HCI. 10 During interaction with the solid surface HCI deposit their potential energy ͑the total ionization energy required for producing the high charge state from its neutral ground state͒ within a few femtosecond in a nanometer-sized volume close to the surface. 10-12 Initially the potential energy is deposited in the electronic subsystem of the target leading to strong electronic excitations. Strong electron-phonon coupling can then induce local surface modifications in various solids. Recently, HCI-induced surface modifications such as hillocks, 13-15 craters, 16 pits, 17 and calderalike structures 18 with nanometer dimensions have been demonstrated. 10 The study of nanostructure formation on surfaces induced by HCI is a relatively new field and still requires a detailed comparison between materials with common and different properties, in order to develop a more general understanding of the underlying mechanisms. For this aim and motivated by our recent findings regarding surface nanostructuring of CaF 2 by means of HCI ͑Refs. 13 and 14͒, we selected BaF 2 as one of the ionic alkaline-earth fluorides ͑along with CaF 2 and SrF 2 ͒ which have a wide range of potential applications in microelectronic ...

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“…光纤飞秒激光器产生的1 μm波段激光经倍频和脉宽压缩后驱动气体靶, 在光子能量为26.5 eV的单谐波线上获得了功率为(12.9±3.9) mW的极紫外光脉冲, 对应的光子通量为3×10 15 光子/s, 在30 eV以上的光子能量下平均功率也已大于1 mW [44] . 脉冲小于500 as [45] . 构等 [12,46−49] .…”

Section: 极紫外阿秒光源unclassified

Prospect for attosecond laser spectra of highly charged ions

Zhang,

Ge,

et al. 2023

Acta Phys. Sin.

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The spectroscopy of highly charged ions (HCI) is of great significance for astronomical observation, astrophysical model establishment, and test of quantum electrodynamics (QED) theory. However, the transitions of HCI are mostly in the extreme ultraviolet or even X-ray range, the excitation spectra of HCI measured by laser spectroscopy in laboratory are very limited due to lack of the suited light source. Up to now, only few experiments on spectroscopy of HCIs performed on synchrotron radiation, free electron laser or heavy-ions storage ring were reported, which are summarized in this work. With development of attosecond technology, several attosecond light source facilities such as Extreme Light Infrastructure Attosecond Light Pulse Source (ELI-ALPS), Synergetic Extreme Condition User Facility (SECUF) have been constructed, which provide a new opportunity for the study of HCI spectroscopy and ultra-short lifetime of energy level in laboratory for its high photon energies and ultra-short pulse durations in the extreme ultraviolet and even soft X-ray range. Electron Beam Ion Traps (EBIT), Electron Cyclotron Resonance (ECR), and heavy-ion storage ring are usually used to generate ions target. But it is difficult to combine the attosecond laser source with large scale facility of HCI for there is not a laboratory have both these two facilities now. Thus, two possible experimental schemes for attosecond spectroscopy of HCIs are proposed in this work. One scheme is that an EBIT can be designed as one terminal of attosecond laser facility, such as ELI-ALPS, SECUF, which can output different laser beams with high photon energy, ultra-short pulse duration or high flux. Another scheme is that a table-top HHG system pumped by all-solid-state femtosecond laser or fibers femtosecond laser with high power can be combined with heavy-ion storage ring, such as ESR, CSRe, HIAF and FAIR. Thanks to high energy of ions in storage ring, the measurable energy levels of HCIs can even be extended to keV by the Doppler shift. Three different measurement methods:fluorescence detection, ions detection and attosecond absorption spectroscopy can be used to obtain the HCI spectroscopy. Finally, a preliminary experimental setup for attosecond laser spectroscopy of HCI is proposed. The proposal on combining extreme ultraviolet attosecond light source with HCI targets is discussed, and the feasibility of attosecond time-resolved precision spectral for HCI is analyzed according to the typical parameters of attosecond light sources and the known excitation cross-sections and detection efficiency, which can provide a new platform for ion level structure calculation, QED theory high-precision test and astronomical spectroscopic observation. It can be used to measure the ultra-short lifetime, low excitation cross-section ionic energy level, and even some transitions with large energy interval. We hope this work can provide a reference for experiments of HCI spectroscopy and ion energy level lifetime measurement in future.

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Novel method for unambiguous ion identification in mixed ion beams extracted from an electron beam ion trap

Cited by 7 publications

References 15 publications

Temperature control of ion guiding through insulating capillaries

Temperature control of ion guiding through insulating capillaries

Pyramidal pits created by single highly charged ions inBaF2single crystals

Prospect for attosecond laser spectra of highly charged ions

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