Measurements of electron-impact ionization cross sections of argon, krypton, and xenon by comparison with photoionization

Сорокин, А. А.; Shmaenok, L. A.; Bobashev, S. V.; Möbus, B.; Richter, M.; Ulm, G.

doi:10.1103/physreva.61.022723

Cited by 69 publications

(65 citation statements)

References 43 publications

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“…Based on the high-accuracy spectral responsivity scale, and by use of dispersed SR of high spectral purity, PTB has supported detector development for industrial and scientific applications [49][50][51][52]. Furthermore fundamental quantities were determined, such as the mean energy required for producing an electron-hole pair in silicon and gallium arsenide [53][54][55], the quantum efficiencies of gold and copper [56,57] and of caesium iodide photocathodes [58], the electron-impact ionisation and photoionisation cross sections of noble gases [59][60][61][62], and the cross sections for resonant Raman scattering on silicon [63].…”

Section: Detector-based Radiometrymentioning

confidence: 99%

“…nisms of nonlinear photoionisation were investigated in focused beams at FLASH, in an extension of the former work of atomic cross-section measurements [59][60][61][62]. For this purpose, ion time-of-flight (TOF) spectroscopy on different gases was performed in the VUV and EUV range [120][121][122][123].…”

Section: 6mentioning

confidence: 99%

“…In a detailed study, the relative biological effectiveness (RBE) of X-rays was investigated by PTB and the German National Research Centre for Environment and Health (GSF) using monochromatised SR in the energy range from 2 keV to 40 keV. The biological effectiveness for 60 Co γ-radiation at about 1.25 MeV was used as the reference (RBE = 1), because it is similar to the radiation to which the well-surveyed atomic bomb survivors in Hiroshima and Nagasaki were exposed. As the biological endpoint of radiation damage, the induction of chromosome aberrations in human blood cells was chosen.…”

Section: X-ray Dosimetry and Medical Applicationsmentioning

confidence: 99%

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A quarter‐century of metrology using synchrotron radiation by PTB in Berlin

Beckhoff¹,

Gottwald²,

Klein³

et al. 2009

Physica Status Solidi (b)

131

114

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For more than 25 years, the Physikalisch‐Technische Bundesanstalt has been strongly engaged in the field of metrology using synchrotron radiation. In Berlin, this research programme started together with the user operation of the electron storage ring BESSY I in the early 1980s. At the beginning, the work was focused on fundamental radiometry, i.e. using the storage ring as a primary radiation source standard and operating beamlines for source and detector calibration in the vacuum ultraviolet spectral range. Meanwhile, at the electron storage rings BESSY II and Metrology Light Source in Berlin‐Adlershof, the activities have been extended to a broad range of fundamental and applied photon metrology in the range from the far infrared to hard X‐rays, including methods like cryogenic radiometry, reflectometry and X‐ray fluorescence spectroscopy. In the present review, we give a short historical introduction to this work, describe our laboratories and the basic radiometric principles, and present examples of recent applications, largely performed within the framework of scientific cooperations with external partners from industry and research. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Section: Detector-based Radiometrymentioning

confidence: 99%

Section: 6mentioning

confidence: 99%

Section: X-ray Dosimetry and Medical Applicationsmentioning

confidence: 99%

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A quarter‐century of metrology using synchrotron radiation by PTB in Berlin

Beckhoff¹,

Gottwald²,

Klein³

et al. 2009

Physica Status Solidi (b)

131

114

View full text Add to dashboard Cite

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“…For rare gas atoms, number of measurements of photoabsorption cross-sections have been carried out for many years (Saloman et al, 1988;Henke et al, 1993;Marr and West, 1967;Lukirskii and Zimkina, 1963;Watson, 1972;Denne, 1970;Deslattes, 1969;Wuilleumier, 1969;Yang and Kirz, 1987;Samson and Stolte, 2002;Saito, 1994;Sorokin et al, 2000). Cross-section values for Ar have been reported in the photon energy region from vacuum ultraviolet radiation to soft X-rays by several workers, using various light sources.…”

Section: Introductionmentioning

confidence: 97%

Total photoabsorption cross-section of Ar in the sub-keV energy region

Suzuki

Saitô

2005

Radiation Physics and Chemistry

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“…On the other hand, neutral Kr has been the subject of numerous experimental (e.g., Henke et al 1967;Lang & Watson 1975;Samson & Yin 1989;Samson et al 1991;Sorokin et al 2000, and references therein) and theoretical (e.g., Amusia et al 1971;Miller et al 1977;Parpia et al 1984;Tulkki et al 1992) PI studies. However, neutral Kr is a trace species in PNe and H II regions, and therefore its PI properties are not expected to play a significant role in Kr ionization balance solutions.…”

Section: Introductionmentioning

confidence: 99%

Atomic data for neutron-capture elements

Sterling

Witthoeft

2011

A&A

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We present multi-configuration Breit-Pauli distorted-wave photoionization (PI) cross sections and radiative recombination (RR) and dielectronic recombination (DR) rate coefficients for the first six krypton ions. These were calculated with the AUTOSTRUCTURE code, using semi-relativistic radial wavefunctions in intermediate coupling. Kr has been detected in several planetary nebulae (PNe) and H II regions, and is a useful tracer of neutron-capture nucleosynthesis. PI, RR, and DR data are required to accurately correct for unobserved Kr ions in photoionized nebulae, and hence to determine elemental Kr abundances. PI cross sections have been determined for ground configuration states of Kr 0 −Kr 5+ up to 100 Rydbergs. Our Kr + PI calculations were significantly improved through comparison with experimental measurements. RR and DR rate coefficients were respectively determined from the direct and resonant PI cross sections at temperatures (10 1 −10 7 )z 2 K, where z is the charge. We account for Δn = 0 DR core excitations, and find that DR is the dominant recombination mechanism for all but Kr + at photoionized plasma temperatures. Internal uncertainties are estimated by comparing results computed with three different configuration-interaction expansions for each ion, and by testing the sensitivity to variations in the orbital radial scaling parameters. The PI cross sections are generally uncertain by 30−50% near the ground state thresholds. Near 10 4 K, the RR rate coefficients are typically uncertain by less than 10%, while those of DR exhibit uncertainties of factors of 2 to 3, due to the unknown energies of near-threshold autoionizing resonances. With the charge transfer rate coefficients presented in the third paper of this series, these data enable robust Kr abundance determinations in photoionized nebulae for the first time, providing a new tool for studying heavy element enrichments in PNe and for investigating the chemical evolution of trans-iron elements.

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Measurements of electron-impact ionization cross sections of argon, krypton, and xenon by comparison with photoionization

Cited by 69 publications

References 43 publications

A quarter‐century of metrology using synchrotron radiation by PTB in Berlin

A quarter‐century of metrology using synchrotron radiation by PTB in Berlin

Total photoabsorption cross-section of Ar in the sub-keV energy region

Atomic data for neutron-capture elements

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