Determination of plasma density from spectra of heliumlike ions

Vinogradov, Aleksandr V; Skobelev, I. Yu.; Yukov, E A

doi:10.1070/qe1975v005n06abeh011298

Cited by 86 publications

(29 citation statements)

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“…comm. !, Vinogradov et al 1975!,~2! a code based on relativistic many-body perturbation theory combined with complex rotation by Lindroth MBL; Tokman et al, 2002!, and~3!…”

Section: Atomic Datamentioning

confidence: 99%

X-ray spectral diagnostics for satellite lines of H-like Mg ions measured by a high resolution spectrometer

Katō

Yamamoto

Rosmej³

2004

Laser Part. Beams

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X-ray spectra of H-like Mg ions produced in a laser plasma have been measured by space-resolved high-resolution spectroscopy. We identified satellite lines near Lya lines, 2lnl' Ϫ1snl ' ϩ hn for n ϭ 2, 3, and 4. We construct a collisional radiative model including the doubly excited states for the intensity ratios of satellite lines. We use atomic data calculated by different methods for satellite lines and compare the results. We derive the electron temperature and density of the laser-produced plasma by a new technique using intensity ratios of only satellite lines. This technique is useful because the Lya lines are often affected by opacity.

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“…comm. !, Vinogradov et al 1975!,~2! a code based on relativistic many-body perturbation theory combined with complex rotation by Lindroth MBL; Tokman et al, 2002!, and~3!…”

Section: Atomic Datamentioning

confidence: 99%

X-ray spectral diagnostics for satellite lines of H-like Mg ions measured by a high resolution spectrometer

Katō

Yamamoto

Rosmej³

2004

Laser Part. Beams

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“…In order to provide an approximate description of the density dependence of the Kα radiative-emission spectra, we have introduced a hierarchy of simple statistical models [1] for the distribution of the population of the initial ions among the various low-lying fine-structure states. The additional collisional transitions among the autoionizing states, which can lead to strong density variations in dense laserproduced plasmas [16][17][18], have not been taken into account in our present Kα spectral simulations. The simple statistical models have been introduced in order to provide a convenient treatment for the multitude of the fine-structure components that must be taken into account.…”

Section: Fementioning

confidence: 98%

“…The spectral intensity of the radiative emission from the autoionizing states can then become a strong function of the electron density [16,17].…”

Section: Spectral Simulations For Kα α α α Emissionmentioning

confidence: 99%

Kα X-ray emission spectra from highly charged Fe ions in EBIT

Jacobs¹,

Beiersdörfer²

2008

Can. J. Phys.

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A detailed spectral model has been developed for the computer simulation of the 2p→1s Kα X-ray emission from highly charged Fe ions in the Electron Beam Ion Trap (EBIT). The spectral features of interest occur in the range from 1.84 Å to 1.94 Å. The fundamental radiative emission processes associated with radiationless electron capture or dielectronic recombination, inner-shell electron collisional excitation, and inner-shell electron collisional ionization are taken in account. For comparison, spectral observations and simulations for high-temperature magnetic-fusion (Tokamak) plasmas are reviewed.In these plasmas, small departures from steady-state corona-model charge-state distributions can occur due to ion transport processes, while the assumption of equilibrium (Maxwellian) electron energy distributions is expected to be valid. Our investigations for EBIT have been directed at the identification of spectral features that can serve as diagnostics of extreme non-equilibrium or transient-ionization conditions, and allowance has been made for general (non-Maxwellian) electron energy distributions. For the precise interpretation of the high-resolution X-ray observations, which may involve the analysis of blended spectral features composed of many lines, it has been necessary to take into account the multitude of individual fine-structure components of the Kα radiative transitions in the ions from Fe XVIII to Fe XXV. At electron densities higher than the validity range of the corona-model approximation, collisionally induced transitions among low-lying excited states can play an important role. It is found that inner-shell electron excitation and ionization processes involving the complex intermediate

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“…Plasma parameters can be determined by the characteristic lines j, k, w, and y 16,17 . The electron temperature, T e , can be determined by the ratio (j+k)/w (the dielectric satellite lines to the resonance line) and the electron density, N e , can be determined by the ratio w/y (the resonance line to the recombination line) 11,12 .…”

Section: Analysis Of Recorded Spectramentioning

confidence: 99%

Absolute soft x-ray calibration of laser produced plasmas using a focusing crystal von Hamos spectrometer

Weeks

Harrison

Johnson

et al. 2005

Laser-Generated, Synchrotron, and Other Laboratory X-Ray and EUV Sources, Optics, and Applications II

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Absolute x-ray calibration of laser-produced plasmas was performed using a focusing crystal von Hamos spectrometer. The plasmas were created by an Nd-YAG laser on massive solid targets (Mg, Cu, Zn, Sn, Mo, Ta, Ti, Steel). A Cylindrical mica crystal and a CCD linear array detector were used in the spectrometer. Both the mica crystal and CCD linear array were absolutely calibrated in the spectral range of λ=7 -15 Å. The spectrometer was used for absolute spectral measurements and the determination of the plasma parameters. The unique target design allowed for multiple instruments to observe the plasma simultaneously which improved analysis. The high spectrometer efficiency allowed for the monitoring of absolute x-ray spectra, x-ray yield and plasma parameters in each laser shot. This spectrometer is promising for absolute spectral measurements and for monitoring laser-plasma sources intended for proximity print lithography.

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Determination of plasma density from spectra of heliumlike ions

Cited by 86 publications

References 0 publications

X-ray spectral diagnostics for satellite lines of H-like Mg ions measured by a high resolution spectrometer

X-ray spectral diagnostics for satellite lines of H-like Mg ions measured by a high resolution spectrometer

Kα X-ray emission spectra from highly charged Fe ions in EBIT

Absolute soft x-ray calibration of laser produced plasmas using a focusing crystal von Hamos spectrometer

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