Producing multicharged fullerene ion beam extracted from the second stage of tandem-type ECRIS

Nagaya, T.; Nishiokada, Takuya; Hagino, Shogo; Uchida, Takashi; Muramatsu, M.; Otsuka, Takeshi; Sato, F.; Kitagawa, A.; Kato, Yushi; Yoshida, Yoshikazu

doi:10.1063/1.4934644

Cited by 13 publications

(6 citation statements)

References 13 publications

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“…Various methods have been used to study the stability and the mechanism of the decay of charged fullerenes. A number of experimental studies demonstrate the existence of a metastable C 60 +n cation with charges up to +10 and more [8][9][10][11][12][13][14]. Most of these results were observed in the collision of fullerenes with highly charged ions.…”

Section: Introductionmentioning

confidence: 99%

The Systems of Volume-Localized Electron Quantum Levels of Charged Fullerenes

Arutyunyan

Osadchy

2018

Journal of Nanomaterials

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The existence of a system of short-lived, discrete, volume-localized electron quantum levels in positively charged fullerenes is theoretically and numerically demonstrated using the example of fullerenes C60 and C20. Unlike experimentally and theoretically well-studied electron states localized in a thin surface layer, these electron states are due to the flat part of the Coulomb potential of a positively charged fullerene sphere. The energy width of the system of such discrete volume-localized levels depends on the charge and increases with increasing charge. For C60+1, the energy width is 0.16 a.u. and increases up to 0.9 a.u. for fullerene C60+10. Thus, the electrons captured on these discrete levels of fullerene form a sort of short-lived superheavy “nanoatom” or “nanoion,” in which the electrons are localized inside a positively charged spherical “nucleus” with an atomic mass of 240 a.u. for C20 and 720 a.u. for C60. Numerous published papers have demonstrated theoretically and experimentally the existence of metastable positively charged C60 fullerenes with a charge of +10 or more, which suggests the possibility of experimental observation of the considering system of volume-localized electronic states. In conclusion, questions are discussed and estimates are made of the possibility of generating coherent radiation at these transitions.

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Section: Introductionmentioning

confidence: 99%

The Systems of Volume-Localized Electron Quantum Levels of Charged Fullerenes

Arutyunyan

Osadchy

2018

Journal of Nanomaterials

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“…The IH-type iron evaporation source consists of a double induction heating coil made by Mo coils, and the IH power supply for consumer use is supplied as a power supply with a maximum of 6.4 kW with the insulated induction heating coil transformer (IHCT), which we have developed originally. In this experiment, the maximum input power to the power supply was mainly about 600 to 800 W. Please refer to the past literature for the heating characteristics of each evaporation source [11,13,16].…”

Section: Experimental Apparatusmentioning

confidence: 99%

“…From the summer of 2014, we started the endohedral fullerene vapor phase synthesis experiment at ECRIS (Osaka University, Osaka, Japan). A tandem-type ECRIS device was constructed [10], and first, in a fullerene ion beam generation experiment, multicharged fullerene ions up to the triple-charged level and beam extraction were successful [11]. Then, we started an experiment on nitrogen-encapsulating fullerene formation, and succeeded in obtaining a spectrum suggesting nitrogen-encapsulating fullerene formation from the analysis of the mass/charge distribution of the extracted ion beam current [12].…”

Section: Introductionmentioning

confidence: 99%

Producing Iron Endohedral Fullerene on Electron Cyclotron Resonance Ion Source

et al. 2021

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An electron cyclotron resonance (ECR) ion source (ECRIS) can generate an available amount of multicharged ions, thus it is not limited for use in the field of accelerator science, but also in medical/biological fields, such as for heavy ion beam cancer treatment and ion engines. The processes of generating multicharged ions are mainly sequential collisions of a direct ionization process by electrons, and have good ion confinement characteristics. By utilizing this confinement property, we have synthesized iron-encapsulated fullerenes, which are supramolecular and can be expected to have various high functions. Fullerenes and iron ions are vaporized from pure solid materials and introduced into the ECRIS together with the support gas. We investigated conditions under which fullerene ions do not dissociate and iron ions are generated so that both can coexist. Generated ions are extracted from the ECRIS and separated by mass/charge with a dipole magnet, and detected with a Faraday cup. This measurement system is characterized by a wide dynamic range. The charge-state distribution (CSD) of ion currents was measured to investigate the optimum conditions for supramolecular synthesis. As a result, a significant spectrum suggesting the possibility of iron-encapsulated fullerenes was obtained. This paper describes the details of these experimental results.

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“…An electron cyclotron resonance ion source (ECRIS) are widely applied for plasma processing and ion beam applications. [1] In our ECRIS, we aim at producing and extracting various ion beams in the single device. It plays an important role in medical field of carbon cancer therapy and aerospace engineering field of artificial satellite engine.…”

Section: Introductionmentioning

confidence: 99%

Optimized deceleration characteristics of multicharged ion beams from electron cyclotron resonance ion source

Sato

Harisaki

Kubo

et al. 2022

J. Phys.: Conf. Ser.

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At present it is necessary the satellite lifetime 10-15 years for operating in space. Xenon is used as fuel for ion engines of satellites. There are problems of accumulated damages at irradiation and sputtering by low energy Xe ion from the engine. It is required to construct database of sputtering yield of ion beams in the low energy region from a hundred eV to 1keV. We are trying to investigate experimentally sputtering yield on satellite component by irradiating the low energy Xe q+ ion beams. We use the electron cyclotron resonance ion source (ECRIS) in the irradiation experiments. We decelerate the beam energy to several hundred eV after extraction at high voltage 10kV. It is found we cannot neglect the contribution of the space potential of the plasma in the ECRIS of several tens eV. We measured the plasma parameters and ion beam deceleration characteristics in operating conditions on ECRIS. As the results, it was found in operating ECRIS condition of low charge state ion being dominant that the space potential of the ECRIS has an effect of 10∼20% at the beam energy at about 100eV in conducting irradiation experiments on satellite component materials.

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Producing multicharged fullerene ion beam extracted from the second stage of tandem-type ECRIS

Cited by 13 publications

References 13 publications

The Systems of Volume-Localized Electron Quantum Levels of Charged Fullerenes

The Systems of Volume-Localized Electron Quantum Levels of Charged Fullerenes

Producing Iron Endohedral Fullerene on Electron Cyclotron Resonance Ion Source

Optimized deceleration characteristics of multicharged ion beams from electron cyclotron resonance ion source

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