VUV/EUV ionising radiation and atoms and ions: dual laser plasma investigations

Kennedy, E. T.; Costello, J. T.; Mosnier, Jean-Paul; Kampen, Paul van

doi:10.1016/j.radphyschem.2003.12.018

Cited by 35 publications

(27 citation statements)

References 138 publications

(123 reference statements)

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“…Experimental access to K-shell photoionization and photoexcitation of atomic ions has been made possible by employing the dual-plasma method (Kennedy et al 2004), the photon-ion merged-beams technique (Schippers et al 2016b), and the exposure of trapped ions to a beam of photons (Crespo López-Urrutia et al 2012). An overview of deep-inner-shell photoabsorption by atomic cations and anions has been provided recently by Müller (Müller 2015).…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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“…In [11], atomic absorption spectrometry using a single device for both light source and sample atomizer has been described for the first time since the explanation of the Fraunhofer lines in the solar spectrum. Costello and coworkers [12][13][14][15] proposed a photoabsorption method for investigation of the laser plasma absorption in the vacuum UV. Two laser pulses were used, separated in space and time.…”

Section: Introductionmentioning

confidence: 99%

Fraunhofer-type absorption lines in double-pulse laser-induced plasma

Nagli¹,

Gaft²,

Gornushkin

2012

Appl. Opt.

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We studied the confocal double-pulse laser-induced plasma in the very beginning of its life. It was found that the second laser pulse fired 0.7 to 5 µs after the first pulse produces plasma which, during the first 0 to 20 ns, resembles solar configuration. There is a very hot and compact plasma core that radiates a broad continuum spectrum and a much larger and cooler outer shell. The light from the hot core passes through the cold outer shell and is partly absorbed by atoms and ions that are in ground (or close to ground) states. This produces absorption lines that are similar to Fraunhofer lines observed in the sun spectrum. The possibility to use these absorption lines for new direct and calibration free laser-induced breakdown spectroscopy analytical applications, both in laboratory and industrial conditions, is proved.

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“…Investigation of the line profiles of atomic krypton in medium‐dense plasmas, at about 1 × 10 23 m −3 , is of particular interest to check the predictions of theoretical approximations. Since krypton is a constituent of laboratory and astrophysical plasmas, the Kr i spectral line shapes represent important sources of information about physical conditions in the place of radiation origin (Kennedy et al 2004; Malcheva et al 2009; Cowley et al 2010). Consequently, knowledge of the Stark‐broadening parameters of spectral lines is of interest for diagnostics, modelling and consideration of astrophysical, laboratory and technological plasmas (Milosavljević & Djeniže 2002; Elabidi, Ben Nessib & Dimitrijević 2006; Popović at al.…”

Section: Introductionmentioning

confidence: 99%

Stark shifts and transition probabilities within the Kr I spectrum

Milosavljević¹,

Simić²,

Daniels³

et al. 2012

Monthly Notices of the Royal Astronomical Society

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On the basis of 28 experimentally determined prominent neutral krypton (Kr I) line shapes (in the 5s-5p and 5s-6p transitions), we have obtained electron (d e ) and ion (d i ) contributions to the total Stark shifts (d t ). Stark shifts are also calculated using the semiclassical perturbation formalism (SCPF) for electrons, protons and helium ions as perturbers up to 50 000 K electron temperatures. Transition probabilities of spontaneous emission (Einstein's A k,i values) have been obtained using the relative line-intensity ratio method.The separate electron (d e ) and ion (d i ) contributions to the total Stark shifts are presented, as well as the ion-broadening parameters, which describe the influence of the ion-dynamical effect on the shift of the line shape, for neutral krypton spectral lines. We made a comparison of our measured and calculated d e data and compared both of these with other available experimental and theoretical d e values.

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VUV/EUV ionising radiation and atoms and ions: dual laser plasma investigations

Cited by 35 publications

References 138 publications

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

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

Fraunhofer-type absorption lines in double-pulse laser-induced plasma

Stark shifts and transition probabilities within the Kr I spectrum

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VUV/EUV ionising radiation and atoms and ions: dual laser plasma investigations

Cited by 35 publications

References 138 publications

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

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

Fraunhofer-type absorption lines in double-pulse laser-induced plasma

Stark shifts and transition probabilities within the Kr I spectrum

Contact Info

Product

Resources

About

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

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