Term diagram

Term-schema, n. term diagram, -verschie-bung, /. term shift, -wert, m. term value. 

It is seen from the term diagram that the energy of interaction of the spin of the electron and its orbital motion is not very great. This energy of interaction increases rapidly with increase in the atomic number of the element and becomes large for the heavy atoms. 

Figure 49. Partial term diagram of Hg(II), indicating the two clockwise Hg(II) laser lines (solid lines), several pulsed Hg(II) laser lines (dashed lines), and other Hg(H) lines of interest. All wavelengths are in an angstroms. Energy available from He+ is also shown.360...

Figure 12. The term diagrams for the Cu(II)-0, complex of various configurations determined by the angles and 4 0 defined in the top drawing. The symmetry labels A and A" denote orbitals symmetric and antisymmetric with respect to the reflection plane of the Clh group at = 30° and — 90°. The individual orbitals at = 90°, <, — 44°, G/ — 2300 cm 1, and Gt = 1800 cm 1 have the following form ...

Figure 13. The term diagram of the Cu(Il)-0, complex at —= 90°, 0 = 44°, and varying Ot ligand strength G/. Vertical bars indicate the positions of experimentally observed bands of Figure 9c.

Figure 8.24 Term diagram for XPS, AES, and EDX. The vacuum energy Evac defines the zero point of the energy scale. The binding energy of electrons Eb, the Fermi energy Ef and the kinetic energy of free electrons Ekin are indicated.

Fig. 1. Partial term diagram of the Si13+ ion, showing the transition that would be induced in an n = 2 laser resonance experiment. (Not to scale)...

It is now appropriate to look at an actual term diagram we choose Balmer-a, figure 1. 

Figure 2.3-1 Principle of infrared absorption a Quanta of the energy hu[, hvs and huo hit the molecule, only hvs is absorbed b term diagram c infrared absorption spectrum.

The term diagrams in Figs. 3-5 allow the expected pattern of electronic excitation to be predicted for a surface splitting of Csv symmetry, provided the strength of the interaction with the surface is known. Conversely, we might hope to deduce the magnitude of the surface interaction from knowledge of excitation spectra, if these can be obtained from adsorbates. 

The first term in Eq. (34a), Vj4, has only one term (diagram) that corresponds to a single excitation, the fourth in number 3 above. The next... 

Fig. 3.—Term diagram ibr the hydrogen atom. The most important lines of the hydrogen spectrum (with some wave-lengths, in A.) are shown as transitions between two terms.

Here again, therefore, we obtain for our term scheme an equidistant succession of energy levels, as in Bohr s theory. The sole difference lies in the fact that the whole term diagram of quantum mechanics is displaced relative to that of Bohr s theory by half a quantum of energy. Although this difference does not manifest itself in the spectrum, it plays a part in statistical problems. In any case it is important to note that the linear harmonic oscillator possesses energy hv in. the lowest state, the so-called zem-jpoint energy. 

P. J. Ilutta to all possible low-symmetry local structures that may occur in zeolite sites [7J. Specific reported examples are the d -> d term diagrams applied to observed optical spectra of transition-ion complexes with olefins, dioxygen, mono-oxygen, and a number of other intrazeolite sorption assemblies. Predictive diagrams have been calculated for the specific locations of the Mn(ll) ions in zeolites, which have been analyzed for magnetic properties [8] and structure [9],... 

Fig. 8 shows a term diagram for this line, together with the relative probabilities of the allowed transitions calculated from the Diraa theory. Beneath the term diagram is a microphotometer tracing obtained by Series. The reality of the... 

If in the next step fluorescence happens, it is called high-temperature or a-phosphorescence (delayed fluorescence). All the processes discussed are included in the term diagram given in Fig. 1.1. If appropriate acceptor molecules B are present, the molecules A and A" can transfer energy according to... 

The tetragonal distortion of the MeFe unit in the crystal is so distinct in most examples (see Table 1) that we must start from a D4A term diagram to describe the electronic transitions. As the elongated coordination obviously predominates, the Bij term will be the ground state, and. 

Fig. 7. Calculated term diagram of a tetragonal [CuFb] - complex. Left side compressed octahedron right side elongated octahedron. Short Cu-F distances always 1.93 A.

Fig. 2. Term diagram for electronic transitions. A Absorption F fluorescence Ph phosphorescence IC internal conversion ISC intersystem crossing. Reprinted from Hesse M, Meier H, Zeeh B (1995) Spektroskopische Methoden in der organischen Chemie, with kind permission of Georg Thieme Verlag, Stuttgart...

The energy term diagrams, i.e., energies of multi-electron states vs. parameter G4 both in units of Racah parameter B, obtained for d°+ (d°) ions in D31, sites... 

Fig. 24. Energy term diagrams for d + (d ) ions in a Djij ligand field with the parameters p=90°, 02/64=10, C/B=4. Reprinted with permission from [56], Copyright 1977 American Chemical Society...

Fig. 29. Term diagram of a Co(II) ion (i) in aTj environment with degeneracy lifting of the T, states by a dynamic Jahn-Teller effect indicated as a symmetric term splitting (left-hand side of the vertical dotted line) (ii) in an environment of lower symmetry (e.g., Q) with removal of the degeneracy (right-hand side of the vertical dotted Une). The best fit for Co(II)-ethylene is obtained for 64/6=6.6 (vertical dotted line). Reprinted from [32] with permission of Academic Press, Inc...

Fig. 35. The n molecular orbitals according to Huckel MO calculations (kfi), energy level diagram (center) and term diagram of benzene with electronic transitions indicated (right). Quoted from [6]. Copyright John Wiley and Sons, Ltd. Reproduced with permission. The other parts are taken from Chang R (1971) Basic principles of spectroscopy. McGraw-Hill Kogakushi, Ltd, Tokyo. Reproduced with permission of the McGraw-Hill Companies...

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