Excited electronic configuration

In the excited electron configuration given, there are two electrons in partly filled orbitals, a Ad (electron 1) and a 5/ electron (electron 2). These are non-equivalent electrons (Section 7.1.2.3a) and we need consider only the coupling of the orbital angular momenta, fj andf2> and the spin angular momenta, Sj and S2-... 

Photon absorption produces excited electron configurations by promotion of an electron from an occupied to a vacant MO. These electronic transitions are described as ... 

As a relevant example, Figure 6.4 shows the room temperature absorption spectrum of Eu + in sodium chloride (NaCl). In this crystal, europium is incorporated in the divalent state, replacing Na+ lattice ions. The spectrum of Eu + ion in NaCl consists of two broad bands, centered at about 240 nm and 340 nm, which correspond to transitions from the ground state ( 87/2) of the 4f electronic configuration to states of the 4f 5d excited electronic configuration. In fact, the energy separation between... 

The symmetry of the quinolizinium ion is such that only four monosubstitution products are possible for any given substituent. On the basis of a computation using the Pariser-Parr-Pople method, including all singlet mono-excited electronic configurations, Galasso (68MI21000) concluded The carbon atoms at 3 and 7 are expected to be most reactive towards electrophilic substitution. ... 

The ground states of most molecules are singlet and contain a pair of electrons with antiparallel spins. On electronic excitation, the ground and the excited electronic configurations are delinked and singlet and triplet states are possible. 

The direct product is also useful for determining the symmetry of ip9l from the symmetry of the occupied MOs. For two nonequivalent electrons outside closed subshells, the symmetry species of el is given by the direct product of the species of the orbitals of the two electrons. For example, the first excited electronic configuration of H20 is... 

Fermi resonance is only a special example of the general phenomenon called configuration interaction, which has been discussed earlier in connection with electronic spectra (page 179). In the latter case each of two different excited electronic configurations gave rise to states which then mixed and... 

If the ir - 77 transition leads to a non-planar structure the first excited electron configuration (31), in which the excited states are labelled by the D2h species classification,... 

Main characteristics of the ground and first excited electron configurations of trivalent RE... 

In passing, it is of interest to note that, according to Fig. 7.1.2, the first excited electronic configuration is (lai )2(l 2)2(2ai )2(lfii)1 (2b2) giving rise to states 3A2 and XA2. It is easy to show that electronic transition Ai A2 is not allowed for a molecule with C2v symmetry. In other words, lA XA2... 

R.F. Nalewajski, Molecular communication channels of model excited electron configurations, Mol. Phys. 104 (2006) 1977. 

Closson and Gray attribute the absorption band at 260 nm to the transition of an electron from the highest occupied TrJ-orbital to the lowest unoccupied 7r -orbital. This transition leads to the excited electronic configuration. .. The band at 200 nm... 

The formula(3) was newly proposed in this paper and the coefficients were so determined as the spectrum of benzene molecules in n-hexane solutions was exactly predicted In the calculations considering all singly excited electronic configurations. The core resonance Integrals Pj.g are ... 

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