Pressure dependence absorption peak

Potassium tantalate. 440-444, 466f Pressure dependence absorption peak, band gap, 226... 

Evaporation of the droplets is an issue on the surfaces, since the vapor pressure of the liquid increases as the droplet radius decreases, thereby making the droplets evaporate even in a saturated vapor environment. The droplet volume can be stabilized by using the WGM size-dependent absorption peaks in the droplets in a supersaturated environment, where droplets increase in size until absorption at a WGM resonance... 

To apply equation (3) for calculation of the equilibrium constant K waves Ia and ic must both be limited by diffusion. To prove this the current is measured under conditions when it is 15% or less of the total limiting current and its dependence on the mercury pressure is followed. A diffusion current must, under these conditions, show a linear dependence on the square root of the height of the mercury column. Whenever possible, polarographic dissociation curves should be compared with data on dissociation obtained by other methods, e.g. potentiometry, N.M.R. or spectrophotometry. In the latter case it is important to show that the species responsible for a given polarographic wave is identical with that responsible for the observed absorption peak. 

C60H36 isomer depends from the synthetic route. The synthesis under dry conditions under high H2 pressure favours the D3d isomer (Meletov et at. 2001 Bini et al. 1998) while the wet synthesis with Zn/HCl it was initially thought to favour the S6 isomer. However, as discussed in the section of the electronic absorption spectra, considerations based on the absorption peak of both C60H36 and C60D36 and on their molar extinction coefficient have lead to assign the Th symmetry to these molecules. Th isomer is the sole isomer characterized by isolated double bonds and is free from benzenoid rings. 

Fig. 14. Transmission spectra of polymeric nitrogen as a fimction of temperature. Spectra are shifted vertically for clarity. The characteristic peak of the T) phase is marked by a vertical arrow. Inset (a) shows the pressure dependence of the absorption spectra of nitrogen at very high pressures and room temperature. Gray lines represent the Tauc fits to the speetra in an appropriate spectral range. The determination of the energy gap from these measurements is obscured by additional losses caused by the presence of a fine ruby powder in the chamber. The high-energy absorption edge is most probably due to stress-induced absorption of diamond anvils (Ref. 62). (b) Urbach plots at 200 GPa and different temperatures (shifted vertically). Gray lines are guides to the eye.

A substantial dependence of the induced absorption on density has been seen in liquid nitrogen when high pressure was applied to the liquid [252], Furthermore, with increasing density, a shift of the peak absorption to higher frequencies is observed while the low-frequency profile is not much affected by increasing density, significantly increased absorption is... 

In the framework of the impact approximation of pressure broadening, the shape of an ordinary, allowed line is a Lorentzian. At low gas densities the profile would be sharp. With increasing pressure, the peak decreases linearly with density and the Lorentzian broadens in such a way that the area under the curve remains constant. This is more or less what we see in Fig. 3.36 at low enough density. Above a certain density, the l i(0) line shows an anomalous dispersion shape and finally turns upside down. The asymmetry of the profile increases with increasing density [258, 264, 345]. Besides the Ri(j) lines, we see of course also a purely collision-induced background, which arises from the other induced dipole components which do not interfere with the allowed lines its intensity varies as density squared in the low-density limit. In the Qi(j) lines, the intercollisional dip of absorption is clearly seen at low densities, it may be thought to arise from three-body collisional processes. The spectral moments and the integrated absorption coefficient thus show terms of a linear, quadratic and cubic density dependence,... 

Comparison of emission spectra between 2100 A and 6500A has shown only small differences in relative concns of excited species between low-pressure diffusion flames and explns, whereas during explns peak intensities may be as much as 100 times greater. The time dependence of the free-radical emission during expln indicates the formation sequence to be OH, CH, C2, and evidence for the forbidden CO Cameron bands has been obtained. Similarly the ultraviolet absorption spectrum of the OH radical in acetylene— H2—02 detonations has been measured in conjunction with the associated rarefaction waves (Ref 7). Analysis of the absorption spectrum has indicated average rotational temps greater than 3000°K during the initial 310 microseconds... 

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