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Using a semiclassical approach, we have considered electron-, proton-, and ionized helium-impact line width and shifts for
32 Y III multiplets.
Published in Zhurnal Prikladnoi Spektroskopii, Vol. 65, No. 4, pp. 476–481, July–August, 1998. 相似文献
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Z. Mijatović 《Journal of Applied Spectroscopy》1996,63(5):709-718
Reported at the 1st Yugoslavian Conference on Spectral Line Broadening, September 11–14, 1995, Belgrade. 相似文献
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Using the semiclassical perturbation method, we consider, for nine Ar VIII transitions, widths and shifts of spectral lines
that are due to collisions with electrons, protons, and ions of He III ut a perturbing particle density of 1018 cm−3 and temperatures between 200,000 and 3,000,000 K.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 67, No. 3, pp. 286–288, May–June, 2000. 相似文献
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Using a semiclassical approach, the authors consider the widths and shifts of spectral lines for twenty In III and two Tl
III multiplets initialed by collisions with electrons, protons, and ions of helium at a density of the perturbing particles
of 1017 cm−3 and temperatures from 20,000 to 500,000 K. For two Pb IV multiplets, the widths and shifts of spectral lines produced by
collisions with electrons, protons, and ions of He III at a density of the perturbing particles of 1017 cm−3 and temperatures from 50,000 to 1,000,000 K are considered similarly.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 66, No. 6, pp. 753–757, November–December, 1999. 相似文献
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Institute of Molecular and Atomic Physics, Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk, 220072, Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 62, No. 2, pp. 145–150, March–April, 1995. 相似文献
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The dependence of the Stark width of the spectral line of He II P
468.6 nm on the electron concentration in the laser plasma of helium for the range of electron densities N
e = (1–10)·1023 m–3 and electron temperatures of the order of 60 kK has been measured. The results obtained correspond well to Griem's theoretical data. An empirical relation is suggested which makes it possible to reliably determine the electron concentration from measured halfwidths in the investigated range of N
e. 相似文献
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Electron spectral density of the half-filled Hubbard model in the atomic limit at finite temperature
We have calculated the spectral function and density of states of halffilled two-dimensional Hubbard model in the Hubbard-I
approximation assuming an antiferromagnetic long range order at low temperature and compared results to the QMC data. It occurs
that calculated functions are in a qualitative agreement with the QMC one. We have also shown that Neel ordered state dispersion
has the similar form to the spin density wave one. 相似文献
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N.N. Lavrentieva A.M. Solodov A.A. Solodov 《Journal of Quantitative Spectroscopy & Radiative Transfer》2010,111(15):2291-26067
The water vapor line broadening and shifting in the ν1+ν2+ν3 band induced by nitrogen pressure are measured with Bruker IFS 125 HR FTIR spectrometer at the spectral resolution of 0.01 cm−1 for the line with upper states angular momentum up to 11. Line contour parameters are calculated using a semi-empirical approach extended by the use of empirical data to determine some fitting model parameters. We use the complete set of high accuracy vibration-rotation dipole transition moments calculated for all possible transitions using wavefunctions determined from variational nuclear motion calculations and an ab initio dipole moment surface. Calculated values of line contour parameters are in a good agreement with observed parameters. 相似文献
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G.Ya. Korenman 《Hyperfine Interactions》1999,119(1-4):227-233
Effect of medium density on shift and broadening of (
) spectral lines is considered in the framework of binary-collision approximation with an effective (
)–He potential including the long-range attraction and short-range repulsion. Quantum calculations of the scattering phase
shifts at reasonable values of the potential parameters allow to explain the main features of the observed density effect
on the shape of (
) spectral lines in low-temperature helium.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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G.D. Roston Z.F. Ghatass 《Journal of Quantitative Spectroscopy & Radiative Transfer》2009,110(3):175-183
The classical theory of collisional broadening and shift parameters (β, δ) of an isolated spectral line was used to obtain simple analytical formulas for calculating both β and δ. These formulas were obtained on the assumption that the short range interaction is effective only in the broadening while the long range is effective in the shift of the spectral line. These parameters β and δ depend on the limiting phase shifts responsible for broadening ηb and shift ηδ. It was found that the values of ηb and ηδ are not equal to each other as was proposed by Weisskopf ηb=ηδ=1. The maximum and average values of ηb (ηb max, ηb av) and ηδ (ηδ max, ηδ av) were obtained by numerical evaluation, using different inverse power potentials. By introducing these parameters into the approximated formulas for β and δ using Van der Waals and Lennard-Jones potential, it was found that the results of calculations for (β and δ) with different atomic transitions perturbed by different inert gases are in close agreement with earlier results. Those results, obtained earlier, were based on the Lindholm-Foley theory especially with the average values of ηb [ηb av=0.6057] and the maximum values of ηδ [ηδ max=1.57625]. The impact parameters ρb and ρδ leading to the broadening and shift of the spectral line were also obtained for different interactions. It was found that the end parameter for the broadening ρb is not equal to the starting parameter for the shift ρδ. 相似文献