![]() After detailed analyses of a series of spectra obtained by applying different detection parameters, like exposure time, slit width, detection mode, and number of accumulations, we attributed the anomalous D 2/ D 1 intensity ratio to the effect of approaching a saturation condition of the charge coupled device detector and thus to an early indication of saturation occurrence. The absorption spectra of 13 C 16 O 2 and 12 C 16 O 2 in air at mole fractions within the range of natural terrestrial and marine abundances are shown in Fig. Determination of electron temperature Te using optical emission spectroscopy technique by estimating the ratio of the intensity of two lines has been adopted. Assuming that the plasma is in local thermal equilibrium it is expected that the intensity ratio of sodium doublet components equals the ratio of the statistical weights of the atomic sublevels corresponding to the electronic transitions ( D 1: 3 2P 1/2–3 2S 1/2, D 2: 3 2P 3/2–3 2S 1/2) i.e. We found that the D 2 to D 1 intensity ratios were not constant, varying from 2 to 1.2. In between you get a range of different emission spectra from the same atom. In hot enough environments they may tend to be fully ionized and it is the free-interaction spectrum that you see most. The 18 O/ 17 O ratios can readily be determined from C 18 O/C 17 O line intensity ratios (see details in, e.g. Room-temperature spectra are compared with laboratory measurements and data. The cluster of four spectra obtained at temperatures of 100 C and lower are significantly stronger than the two obtained at 125 C and 150 C. In cool environments most atoms dont get excited and therefore dont emit. line intensity ratio gives an electron temperature of 3.4 x 10 6 K. Figure 3 Raman spectra of different N-GQD samples prepared from pyrene with different urea amounts at 200 ☌ (10 h) and GQDs. In this paper we present the results of intensity measurements of D 1 (589.5224 nm) and D 2 (588.9950 nm) sodium doublet spectral lines emitted from a short-lifetime plasma randomly appearing across the aluminum anode surface during its electrolytic oxidation from the water solution of boric acid with sodium tetraborate. The peak position of the Raman band at room temperature is 520.6 cm -1 and the band shifts to progressively lower energy, reaching 517.3 cm -1 at 150 C. Values of D peak and G peak frequency, intensity of each vibrational spectral peak, and intensity ratio (I D /I G) taken from the spectra are presented in Table 2. ![]()
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