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84927904128
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(b) M. C. Downer et al., in Proceedings of the Tenth International Conference on Spectral Line Shapes, edited by L. Frommhold and J. W. Keto, AIP Conf. Proc. No. 216 (AIP, New York, 1990).
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Note that the nonlinear index n2> 0 of the neutral gases or ions, if significantly present, would induce a rising index (redshift) in the leading edge of the pulse and a falling index (blueshift) in the trailing edge, contrary to the observed blueshift in the leading edge, which must therefore be caused solely by ionization.
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0001809077
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Impact-ionization cross sections for intensely irradiated atoms and ions are probably larger than the values for ground-state atoms and ions given in these tables and used in our calculations.
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(1987)
At. Data Nucl. Data Tables
, vol.36
, pp. 167-353
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Tawara, H.1
Kato, T.2
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For example, using the BSI model, we obtain the following threshold intensities for the first seven ionization stages in Kr: log10( IBSI) =14.19, 14.54, 14.92, 15.28, 15.45, 15.56, 16.09 W/cm2, log10( Icoll) =14.59, 14.83, 15.01, 15.16, 15.26, 15.32, 15.49 W/cm2.
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84927904125
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Calculations which include convolution over realistic transverse intensity profiles have also been done and yield the same qualitative spectral features as shown in Figs. 3(a) and 3(b), typically with peaks of somewhat different widths and amplitudes. Since, however, the geometry of the interaction region is not quantitatively characterized because of defocusing, calculations using the simpler geometry are presented to illustrate the essential physics.
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84927904124
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The ionization-induced index change Δ nplasmaapeq2 - 2 π N e2/ m app - 0.02 for 1-atm triply ionized plasma exceeds even the hypothetical nonlinear index n2neutralI which would be induced by light of intensity I = 1016 W/cm2 interacting with neutral He, Ne, Kr, and Ar (for Xe, n2neutralI apeq2 Δ nplasma), using measured n2neutral values (Lehmeier et al., Ref. [7]). Taking into account the disappearance of the neutral gas early in the pulse, and the smaller n2ion values of the ions, n2ionI is small compared to Δ nplasma at the peak of our pulse in all the noble gases. As for the free electrons, n2electron becomes significant only for relativistic quiver velocities ( I app 1018 W/cm2).
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Wm. M. Wood, C. W. Siders, and M. C. Downer (to be published); Wm. M. Wood, Ph.D. dissertation, University of Texas at Austin, 1991 (unpublished).
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