Helium-filled proportional counter operated at low temperatures higher than 13 K

Fukumura, K.; Katano, Rintaro; Kobayashi, Takayuki; Nakanishi, A.; Isozumi, Yasuhito

doi:10.1016/0168-9002(91)90014-h

Cited by 22 publications

(4 citation statements)

References 9 publications

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“…The low temperature CEM spectra were recorded using a proportional counter filled with a counter gas of 1 bar pressure at RT. Hydrogen was used as counter gas for the measurements at 17 K and 50 K, while 98%He-2%CH 4 gas mixture was applied for the measurements at temperatures higher than 70 K. The CEM apparatus with the proportional counter was described in detail elsewhere [78,79]. The major part of the information with this method can be obtained mainly from sample depths less than 100 nm [80][81][82].…”

Section: Methodsmentioning

confidence: 99%

Swift heavy ion irradiation-induced amorphous iron and Fe–Si oxide phases in metallic 57Fe layer vacuum deposited on surface of SiO2/Si

Кузманн

Nomura

Stichleutner

et al. 2022

Journal of Materials Research

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Abstract57Fe conversion electron Mössbauer (CEM) spectroscopy, SEM and magnetization measurements were used to study the effect of swift heavy ion irradiation on metallic 57Fe (10 nm) thin layer vacuum deposited onto SiO2/Si. About 85% of the total iron content of the surface layer detected by CEM was present as metallic, crystalline alpha iron before the irradiation, while upon irradiation with 160 MeV Xe ions, with a fluence of 5 × 1013 ion cm−2, ~ 21% was converted to amorphous iron and ~ 47% to silicon-containing iron oxide phases. The presence of pure iron in the amorphous state was evidenced by CEM in agreement with magnetization measurements. Temperature dependence of CEM measurements and the FC/ZFC curves of the irradiated deposit indicated superparamagnetic nature of the iron-silicon-oxide phases. The results are discussed in terms of the thermal spike model for the formation of the amorphous iron phase that can be essential for the formation of silicon-iron-oxides. Graphical abstract

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Section: Methodsmentioning

confidence: 99%

Swift heavy ion irradiation-induced amorphous iron and Fe–Si oxide phases in metallic 57Fe layer vacuum deposited on surface of SiO2/Si

Кузманн

Nomura

Stichleutner

et al. 2022

Journal of Materials Research

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“…Many results have been published between 1.75 K and 300 K with sealed counters and various filling gases, the objective being mainly to study the operating conditions of the counters [12,[14][15][16][17][18][19][20][21]. Some authors have also reported a few Mössbauer spectra recorded between 80 K and 300 K using a gas flow counter at low temperature but the operating conditions have been poorly investigated [22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 98%

Gas counter for low temperature Conversion Electron Mössbauer Spectroscopy experiments

et al. 2011

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The operation of a gas counter, designed for Conversion Electron Mössbauer Spectroscopy measurement at low temperature, has been investigated. The experimental setup is described and tested with two pure gases, He and Ne, and two mixtures, He-5%CH 4 and He-5%N 2 . The impacts on the counter performances of the applied voltage, the gas composition and pressure as well as the gas renewing are investigated between 41 K and 300 K. This investigation is made using 119 Sn Mössbauer source and metallic tin absorber. The appropriate operating conditions of the present counter have been established for temperatures down to 41 K for both pure gases, and 61 and 85 K for He-5%N 2 and He-5%CH 4 respectively.

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“…The CEMS system with a proportional counter for low-temperature measurements is described elsewhere. [14][15][16][17][18][19] The proportional counter in the system was filled with hydrogen gas at 1 bar at RT. A 57 Co͑Rh͒ source of about 740 MBq was used for the CEM measurements.…”

Section: Methodsmentioning

confidence: 99%

Fine iron particles formed in a sapphire crystal by the ion implantation technique

Kobayashi

Nakanishi

Fukumura

et al. 1998

Journal of Applied Physics

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The magnetic properties of iron atoms implanted into a sapphire crystal at a dose from 4×1016 to 1×1017 Fe/cm2 were investigated using conversion electron Mössbauer spectroscopy at low temperature. It was confirmed that the components in the Mössbauer spectra which have been assigned to the Fe4+ state so far by other researchers are caused by fine particles of metallic iron, and about 75% of the implanted iron atoms stabilize in the form of fine particles of α iron at high implantation dose. Growth of the fine particles was simulated with a computer, and the expected Mössbauer spectra were calculated considering the influence of the nearest neighbors and next-nearest neighbors on the magnetic hyperfine field of the iron atoms. The simulated spectra agrees well with the experimentally observed spectra on the whole.

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Helium-filled proportional counter operated at low temperatures higher than 13 K

Cited by 22 publications

References 9 publications

Swift heavy ion irradiation-induced amorphous iron and Fe–Si oxide phases in metallic 57Fe layer vacuum deposited on surface of SiO2/Si

Swift heavy ion irradiation-induced amorphous iron and Fe–Si oxide phases in metallic 57Fe layer vacuum deposited on surface of SiO2/Si

Gas counter for low temperature Conversion Electron Mössbauer Spectroscopy experiments

Fine iron particles formed in a sapphire crystal by the ion implantation technique

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