Characterization and recent modifications of a compact 10 GHz Electron Cyclotron Resonance (ECR) ion source for atomic physics experiments

Trassl, R.; Hathiramani, P.; Broetz, F.; Greenwood, J. B.; McCullough, R W; Schlapp, M.; Salzborn, E.

doi:10.1088/0031-8949/1997/t73/126

Cited by 13 publications

(7 citation statements)

References 2 publications

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“…42 As primary source for the production of the target molecular cations we have used gaseous NH 3 . The gas leaked into the plasma chamber of a 10 GHz Electron Cyclotron Resonance (ECR) 43 ion source via an electronic needle valve keeping the gas pressure in the order of 2 Â 10 À5 hPa. Fig.…”

Section: Methodsmentioning

confidence: 99%

Inner-shell X-ray absorption spectra of the cationic series NH_y⁺ (y = 0–3)

Bari

Inhester

Schubert

et al. 2019

Phys. Chem. Chem. Phys.

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Section: Methodsmentioning

confidence: 99%

Inner-shell X-ray absorption spectra of the cationic series NH_y⁺ (y = 0–3)

Bari

Inhester

Schubert

et al. 2019

Phys. Chem. Chem. Phys.

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“…The Ne + ions for this experiment were produced by a compact 10 GHz permanent-magnet electron-cyclotron-resonance (ECR) ion source (Trassl et al 1997). Natural neon gas was leaked into the source, which was on a potential of +6kV with respect to the grounded beam pipe.…”

Section: Methodsmentioning

confidence: 99%

Photoionization of Ne Atoms and Ne⁺ Ions Near the K Edge: PrecisionSpectroscopy and Absolute Cross-sections

Müller

Bernhardt

Borovik

et al. 2017

ApJ

114

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Single, double, and triple photoionization of Ne + ions by single photons have been investigated at the synchrotron radiation source PETRA III in Hamburg, Germany. Absolute cross-sections were measured by employing the photon-ion merged-beams technique. Photon energies were between about 840 and 930 eV, covering the range from the lowest-energy resonances associated with the excitation of one single K-shell electron up to double excitations involving one K-and one L-shell electron, well beyond the K-shell ionization threshold. Also, photoionization of neutral Ne was investigated just below the K edge. The chosen photon energy bandwidths were between 32 and 500 meV, facilitating the determination of natural line widths. The uncertainty of the energy scale is estimated to be 0.2 eV. For comparison with existing theoretical calculations, astrophysically relevant photoabsorption cross-sections were inferred by summing the measured partial ionization channels. Discussion of the observed resonances in the different final ionization channels reveals the presence of complex Auger-decay mechanisms. The ejection of three electrons from the lowest K-shell-excited Ne + ( s s p 1 2 2 S 2 6 2 1 2 ) level, for example, requires cooperative interaction of at least four electrons.

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“…The Fe + ions for this experiment were produced according to the prescription of Koivisto et al (1994), i.e., by evaporating ferrocene (C 10 H 10 Fe) powder and leaking the vapor into an electron-cyclotron-resonance (ECR) ion source. For the present experiments, a compact 10-GHz permanent-magnet ECR source was used (Trassl et al 1997). At room temperature, ferrocene has a sufficiently high vapour pressure of 1 Pa (Monte et al 2006), such that ferrocene vapour could be easily leaked into the ion source.…”

Section: Methodsmentioning

confidence: 99%

Near L-edge Single and Multiple Photoionization of Singly Charged Iron Ions

Beerwerth

Buhr

Perry‐Sassmannshausen

et al. 2017

ApJ

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Absolute cross sections for m-fold photoionization (m = 1, . . . , 6) of Fe + by a single photon were measured employing the photon-ion merged-beams setup PIPE at the PETRA III synchrotron light source, operated by DESY in Hamburg, Germany. Photon energies were in the range 680-920 eV which covers the photoionization resonances associated with 2p and 2s excitation to higher atomic shells as well as the thresholds for 2p and 2s ionization. The corresponding resonance positions were measured with an uncertainty of ±0.2 eV. The cross section for Fe + photoabsorption is derived as the sum of the individually measured cross-sections for m-fold ionization. Calculations of the Fe + absorption cross sections have been carried out using two different theoretical approaches, Hartree-Fock including relativistic extensions and fully relativistic Multi-Configuration Dirac Fock. Apart from overall energy shifts of up to about 3 eV, the theoretical cross sections are in good agreement with each other and with the experimental results. In addition, the complex deexcitation cascades after the creation of inner-shell holes in the Fe + ion have been tracked on the atomic fine-structure level. The corresponding theoretical results for the product charge-state distributions are in much better agreement with the experimental data than previously published configuration-average results. The present experimental and theoretical results are valuable for opacity calculations and are expected to pave the way to a more accurate determination of the iron abundance in the interstellar medium.

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Characterization and recent modifications of a compact 10 GHz Electron Cyclotron Resonance (ECR) ion source for atomic physics experiments

Cited by 13 publications

References 2 publications

Inner-shell X-ray absorption spectra of the cationic series NH_y⁺ (y = 0–3)

Inner-shell X-ray absorption spectra of the cationic series NH_y⁺ (y = 0–3)

Photoionization of Ne Atoms and Ne⁺ Ions Near the K Edge: PrecisionSpectroscopy and Absolute Cross-sections

Near L-edge Single and Multiple Photoionization of Singly Charged Iron Ions

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Characterization and recent modifications of a compact 10 GHz Electron Cyclotron Resonance (ECR) ion source for atomic physics experiments

Cited by 13 publications

References 2 publications

Inner-shell X-ray absorption spectra of the cationic series NHy+ (y = 0–3)

Inner-shell X-ray absorption spectra of the cationic series NHy+ (y = 0–3)

Photoionization of Ne Atoms and Ne+ Ions Near the K Edge: PrecisionSpectroscopy and Absolute Cross-sections

Near L-edge Single and Multiple Photoionization of Singly Charged Iron Ions

Contact Info

Product

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Inner-shell X-ray absorption spectra of the cationic series NH_y⁺ (y = 0–3)

Inner-shell X-ray absorption spectra of the cationic series NH_y⁺ (y = 0–3)

Photoionization of Ne Atoms and Ne⁺ Ions Near the K Edge: PrecisionSpectroscopy and Absolute Cross-sections