Stark levels complex energy

The Stark effect is related to a change in energy levels of atoms and molecules in the presence of a strong external electric field and is observed as a shift and splitting of the spectral rotational lines. The applicability of the method is restricted to the gas phase and more complex compounds require the use of isotopically labeled molecules [43,44,50-52]. 

Spectra are a record of transitions between electron energy levels. Each spectral line can be related to the transition from one energy level to another. It is found that an ion in a magnetic field has a more complex spectrum, with more lines present, than has the same ion in the absence of the magnetic field. The presence of additional lines in the spectrum of an atom or ion when in a magnetic field is called the Zeeman effect. A similar, but different, complexity, called the Stark effect, arises in the presence of a strong electric field. The electron configurations described are not able to account for all of the observed transitions, and to derive the possible... 

Since the energy gap between the Stark splitting levels reflects its geometrical symmetry [32], Eu(hfa)3(dppypo) might be similar to Eu(hfa)3(dpppo) and Eu(hfa)3(dpbtpo) in its structure in acetone-t/g. The emission quantum yields of Eu(hfa)3(dpppo), Eu(hfa)3(dppypo) and Eu(hfa)3(dpbtpo) in acetone-dg were found to be 0.60, 0.61 and 0.62, respectively (Table 4.3). These emission quantum yields are similar to those reported for Eu(hfa)3(biphepo) ((Pli, = 0.60 in acetone-t/g) and Eu(hfa)3(tppo)2 (( Ln = 0-65 in acetone-dg), both of which have been reported as highly luminescent Eu(III) complexes [38]. 

In this chapter, the author found that the emission intensities at the electric dipole transition of Eu(III) complexes depended on the organic linker species in phosphine oxide ligands, although the energy gap between Stark splitting levels, radiative and non-radiative rate constants were not affected by them. It seems that... 

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