Argon density

This leaves only ions in the vibrational ground state, in the v2 = 1 bending-mode vibration at 0.3126 eV, and in the v, = 1 breathing mode vibration at 0.394 eV (see Lie and Frye 47 or Oka and Jagod6). Since the argon density in these experiments is quite high ( 5 x 1015cm-3), v > 1 ions would be destroyed in less than 1 (is. This is an important point, since Smith and Spanel s proposed reconciliation of theory and experiment rests on the assumption that vibrationally excited ions dominate the plasma. 

Fig. 3.7. Spectral function of neon-argon mixtures at high densities, obtained with a constant neon density of 77 amagat the argon densities are 416 (o), 488 (x), 530 ( ), and 553 ( ) amagats, respectively. For comparison, the binary profile [75] (+) is also shown. All profiles are normalized so that intensities are equal at peak absorption (near 100 cm-1) after [252],...

Fig. 3.18. Comparison of the D2-Ar ( ) and H2-Ar (x) rotational spectra at 165 K, and 142 and 150 amagat argon density for deuterium-argon and hydrogen-argon mixtures, repectively, and a hydrogen concentration of 2 to 10% after [109],...

Figure 3.18 compares the spectrum of D2-Ar recorded at 165 K at a density of 142 amagat with an H2-Ar spectrum recorded at the same temperature and 150 amagat argon density [109]. As expected, we see more rotational lines, So(J) with J = 0,. ..4, than for H2-Ar, and these have different relative intensities. The rotational lines are also sharper, roughly by the factor 1/ /2. The spectral moment Mo is the same as for H2-Ar, well within the experimental uncertainties, as it should be. 

The results are shown in Fig. 3.28. Spectral moments M have been normalized by the product of hydrogen and argon densities, so that all data shown should represent horizontal lines if only binary interactions occurred. Instead, we see straight lines with negative slopes for Mq and t2,... 

Figure 3.29 compares two line profiles obtained in the fit. The solid line represents the rotational line profile in the zero density limit (ii = 8.4 x 10-14 s, T2 = 5.1 x 10 14 s, from Fig. 3.28). The dashed line shows the profile at 185 amagat of argon (n = 8.94 x 10-14 s, 12 = 2.70 x 10-14 s). The amplitudes S are here arbitrarily set to unity, S = 1, in both cases so that the areas under the curves are equal. We note a very slight narrowing of the profiles near the line centers this is caused by ii which increases slightly with density. Moreover, the far wing intensities increase with increasing argon density which is related to the decreasing 12 values see the discussion of the properties of the BC profile, p. 271.

Fig. 3.30. Experimental reduced line shapes of the induced D2 So lines of deuterium-argon mixtures at 165 K argon density 142 ( ) and 650 amagat (o) after [109].

Fig. 3.38. Absorption of N2-Ar in the fundamental band of N2 [111]. Nitrogen and argon densities were both 19 amagat room temperature measurement ( ) the solid line represents a fit based on the stick spectrum and a J-independent quadrupole transition moment. In pure nitrogen, an almost identical spectrum was obtained.

Fig. 3.48. Enhancement of the absorption in the fundamental band in a hydrogen-argon mixture at low and high densities at 152 K the profiles are normalized to give Si(l) the same peak intensity. The argon density was 8 ama-gat (solid line) and 820 amagat (dashed line), respectively. The density splitting of the (overlap-induced) Q branch and the density narrowing of the S lines are apparent. A new (quadrupole-induced) Q line appears inthe wide absorption dip (between Qp and Qr) observed at high density. Reproduced with permission from the National Research Council of Canada from [137].

Comparison of ternary moments with measurements. The density dependence of the helium-argon collision-induced absorption spectra has been studied at the temperature of 165 K, helium densities from 66 to 130 am-agats, and argon densities from 156 to 280 amagats. Ternary moments of... 

Fig. 7.1. Argon injection via a piezo-electric valve, with the opening voltage waveform shown in the bottom frame along with the Ar16+ X-ray brightness time history. The electron density and temperature, along with the argon density are shown in the top two frames...

Fig. 8.3. (a) Radial profiles of argon density in TEXTOR point line H-like, dashed line He-like solid line Li-like ions. Emissivity profiles of the different argon stages presented in (b) point line H-like, dashed line He-like, solid line Li-like ions... 

Fig,3,11, (a) Pressure broadening and shifts of some alkali resonance lines by different gases. The numbers are given in cm l for standard conditions (1 atm, 15°C). (b) Halfwidth and line shift (in cm l) of the Cs line X = 894.3 nm as a function of relative argon densities (density n at pressure p divided by the density at standard conditions) [3.2]... 

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