Spectroscopy of laboratory plasmas

Burgess, D D

doi:10.1007/bf00213474

Cited by 30 publications

(9 citation statements)

References 91 publications

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“…The results of diagnostic experiments described above (and not discussed in the original publication) were used as a basis for the estimation and subsequent elimination of the usual causes of asymmetry, discussed above (see also Baker 1977). The only effect predicting asymmetries of the magnitude and type observed was the interference asymmetry predicted by Burgess (1968).…”

Section: Quantum Interference Asymmetriesmentioning

confidence: 87%

“…The first reported observations of the quantum interference asymmetry predicted by Burgess (1968) were made on this source, and were reported briefly in an earlier publication (Baker and Burgess 1977). The lines of Ar 111 multiplet 1 uv, and Ar 11 multiplet 6 4806 and 4848 A all showed marked asymmetries, with enhanced blue wings, which could not be explained by any of the conventional causes of asymmetry (e.g.…”

Section: Quantum Interference Asymmetriesmentioning

confidence: 95%

“…In this paper, we report measurements of the quadrupole asymmetry of the far wings of Lyman-a, from AA = 1 to 20 A, for ne = 2.8 x 10'' ~m -~, T, = 22 700 K. Burgess (1968) first predicted that for certain transitions quantum-mechanical interference effects could modify the otherwise Lorentzian wings of electron-impactbroadened lines of ionised emitters, giving rise to measurable asymmetries at high electron densities. As pointed out in that paper there are two separate yet quantummechanically indistinguishable routes for photon absorption (namely bremsstrahlung absorption, and absorption in the wing of pressure-broadened lines), the resulting interference terms giving rise to an extra contribution to the usual line-shape expression.…”

Section: Quadrupole Asymmetriesmentioning

confidence: 99%

“…In addition all the existing estimates are based on time-averaging assumptions which seem questionable (see Burgess 1964Burgess , 1972.…”

Section: Introductionmentioning

confidence: 99%

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Ultrasound Tissue-Mimicking Materials using Oil Gel and Measurement of Their Characteristics

Kondo

Fujimoto

2002

Jpn. J. Appl. Phys.

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We report observation$ of high-density effects on spectral line shapes. Specifically we present new data on the effects of local plasma polarisation, quasi-molecular interactions, quadrupole potentials and quantum interference effects in dense (ne > loi8 c K 3 ) argon plasmas with only a small number of particles per Debye sphere. E A M Baker and D D Burgesssituation for four specific high-density effects on vuv line shapes expected to be significant in this plasma, and then report experimental observations on each related topic.

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Section: Quantum Interference Asymmetriesmentioning

confidence: 87%

Section: Quantum Interference Asymmetriesmentioning

confidence: 95%

Section: Quadrupole Asymmetriesmentioning

confidence: 99%

“…In addition all the existing estimates are based on time-averaging assumptions which seem questionable (see Burgess 1964Burgess , 1972.…”

Section: Introductionmentioning

confidence: 99%

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Ultrasound Tissue-Mimicking Materials using Oil Gel and Measurement of Their Characteristics

Kondo

Fujimoto

2002

Jpn. J. Appl. Phys.

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“…As one example, the simple expression V = Ze /R, , suggested by Burgess and Peacock (1971), was used to obtain the curve shown in the figure. Burgess (1972) (Burgess and Peacock, 1971;Van Zandt et al, 1976;Pittman and Kelleher, 1980), and it is not yet certain if even the form jf Eq. 22is correct.…”

Section: Methodsmentioning

confidence: 99%

Atomic phenomena in dense plasmas

Weisheit¹

1981

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Untersuchungen an dichtenz-Pinch-Plasmen

Finken

1983

Fortschr. Phys.

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Nach einem Überblick über die bisher veröffentlichte Literatur zu Messungen an z‐Pinch Plasmen wird hauptsächlich über spektroskopische Untersuchungen an dichten Plasmen berichtet. Als Plasma quelle dient einmal ein dynamischer z‐Pinch, der Elektronendichten im Bereich 5 · 1017 cm−3 ≦ Ne ≦ 5 · 1019 cm−3 bei Temperaturen von 10 eV>kTe>3 eV bereitstellt. Aus Messungen der Kontinuumslichtintensität, die im Wellenlängenintervall von 200 nm ≦ λ ≦ 12 μm durchgeführt wurden, sind die Elektronendichte und die Elektronentemperatur abgeleitet worden. Fernerhin gibt überthermische Lichtemission bei langen Wellenlängen Hinweise auf die Mikroturbulenz, die durch den elektrischen Stromflußangefacht wird. Bei Untersuchungen der Hα‐Linie wurden Linienverschiebungen und„Strukturen”︁ auf die Spektrallinie näher analysiert. Es konnte aus dem selbstumgekehrten Teil der Linie Auskunft über das Magnetfeld der Korona gewonnen werden, die das dichte Plasma‐umgibt. Für die Untersuchung der Wechselwirkung zwischen einem dichten Plasma und einem leistungsstarken CO2‐Laser‐Strahl liefert der dynamische z‐Pinch ein vollionisiertes und gut reproduzierbares Ausgangsplasma. Es wird in diesem Zusammenhang der Problemkreis der induzierten Brillouin‐Rückstreuung analysiert. Neben dem konventionellem z‐Pinch wird eine neuartige Entladungsart, der „gasummantelte Pinch”︁ beschrieben. Nach theoretischen Vorstellungen wird dieser z‐Pinch dadurch stabilisiert, daß er von einem dichten Gasmantel umgeben wird. Die ersten Untersuchungen bestätigen die Stabilisierung der gefährlichsten langwelligen Instabilitäten; kurzwellige Instabilitäten können jedoch nicht vollständig unterdrückt werden.

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Spectroscopy of laboratory plasmas

Cited by 30 publications

References 91 publications

Ultrasound Tissue-Mimicking Materials using Oil Gel and Measurement of Their Characteristics

Ultrasound Tissue-Mimicking Materials using Oil Gel and Measurement of Their Characteristics

Atomic phenomena in dense plasmas

Untersuchungen an dichtenz-Pinch-Plasmen

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