Level scheme barium

Other substances, such as barium sulfide, can absorb a certain wavelength of light, but because of the molecular energy level scheme and the quantum mechanical selection rules which govern energy level transitions, the absorbed radiation may be emitted at a longer wavelength and there may also be a time delay in the transition. An examination of Fig. 8.3 will help clarify this statement and also depict the difference between phosphorescent and fluorescent materials. 

From casework statistics the unique particles (those containing the combination lead, antimony and barium, and those containing antimony and barium) occur in the ratio 7 3, respectively. Approximate percentages for indicative particles are lead-only 55% lead, antimony 20% lead, barium 8% antimony-only 7% barium, calcium, silicon 5% barium-only 5%. Table 19.3 gives an indication of the levels of the primary elements in each particle type. Table 19.4 gives an indication of the levels of accompanying elements in each particle type and is the basis for note b in Table 19.5, Particle Classification Scheme. 

II. The polarization detection scheme allows a sensitivity increase by three to four orders of magnitude compared to sophisticated mw spectroscopy techniques, at the same resolution. Application of saturation modulation which is a nonlinear mw spectroscopy technique developed by Tdrring, permits the detection of about 10"° absorption of the incident mw intensity. This allows the study of rotational transitions of alkaline earth monohalides in the 100 to 300 GHz range, i.e. transitions between levels with high rotational quantum numbers in the case of strontium and barium monohalides. Then the hfs is not resolved because... 

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