Metals, radiative properties

Touloukian, Y.S., and DeWitt, D.P. (1972), Thermal Radiative Properties of Non-metallic Solids, in Thermophysical Properties of Matter, Plenum, New York, pp. 3a-48a. 

Sc(OEP)C>2CMe is 0.4 s, which is the longest for any porphyrin, while the fluorescent yield of 0.2 is very high. The radiative properties are explained in terms of covalent interactions between the metal and the ring as modified by the probable location of the metal ion above the porphyrin plane.24 Scandium OEP complexes are reduced to the a, y-dihydro derivatives on reduction with sodium anthracenide and methanol.25 The redox potentials of Sc(OEP)OH have been determined by cyclic voltammetry to be ligand oxidation in PrCN, 1.03 and 0.70 ligand reduction in DMSO, —1.54 (Ey2 values in V vs. SCE) no metal redox wave was observed.26... 

Table A-2 Boiling and freezing point properties 843 Table A-3 Properties of solid metals 844 846 Table A-4 Properties of solid nonmetals 847 Table A-5 Properties of building materials 848-849 Table A-6 Properties of insulating materials 850 Table A-] Properties of common foods 851-852 Table A-8 Properties of miscellaneous materials 853 TableA-9 Properties of saturated water 854 Table A 10 Properties of saturated refrigerant-134a 855 Table A-11 Properties of saturated ammonia 856 Table A-12 "Properties of saturated propane 857 Table A-13 Properties of liquids 858 Table A-14 Properties of liquid metals 859 Table A- 5 Properties of air at 1 atm pressure 860 TableA-16 Properties of gases at 1 atm pressure 861-862 Table A-17 Properties of the atmosphere at high altitude 863 Table A-18 Emissivities of surfaces 864-865 Table A-19 Solar radiative properties of materials 866 Figure A-20 The Moody chart for friction factor for fully developed flow in circular pipes 867...

Surface enhanced fluorescence (SEE) takes place in the proximity of metal structures. The effect of fluorescence enhancement has been intensively studied by several groups [74]. In the proximity of metals, the fluorophore radiative properties are modified and an increase in the spontaneous emission rate is observed. 

The available data for radiative properties of metallic and nonmetallic surfaces can be found in a number of data bases [9,10] they are too extensive to be included in this chapter. Also, the reader is referred to a number of recent handbooks and reviews for more detailed data [11-17],... 

The relations given for both dielectrics and metals are for unpolarized incident radiation if polarization is important, then more detailed analysis must be used (see Refs. 1, 3,18,19). Also, the refractive index and absorption index may show spectral dependence, in which case the computed radiative properties will also be spectral in nature. 

In the case of metals processing, surface impurities such as thin layers deposited either by adsorption or chemical reaction (such as oxide layers) can increase the surface emissivity dramatically (Fig. 18.31). Because of the extreme sensitivity of the effective radiative properties of metals to minor surface roughness or contamination, it is recommended that measured radiative property values be used when possible. 

Y.S. Touloukian and D.P. DeWitt, Thermal Radiative Properties -Metallic Elements and Alloys, Thermophysical Properties of Matter-Volume 7, IFI/Plenum, New York, 1970. 

Speed is equal to the speed of sound in the material. The waves are treated as a particle, called a phonon, in definite discrete unit or quantum of vibration mechanical energy. Electrons dominate energy transport in metals. Photons are quanta of electromagnetic energy as phonon is quantum of vibrational mechanical energy. One mode of energy fiansport in vacuum is by photons. Photons can interact with photons and phonons to render radiative properties of solids. 

Alkali metal atoms represent a suitable model system for studying adsorbate fluorescence due fo fheir simple energy strucfure and prominent radiative properties. Figure 6.17 shows the energy levels of a sodium atom. The ground state 5Sj/2 can be excited either in two steps via successive 3Si/2 3P3/2 and 3P3/2 5Si/2 transitions, or via a direct two-photon... 

Metal d-orbital contributions are important for radiative properties of the excited states and determine the zero-field splittings (zfs) of the triplets into sublevels via spin-orbit coupling (soc). 

Thermal Radiative Properties—Metallics Elements, Alloys... 

The optical and PL spectroscopies have been undertaken to understand the structure-property correlations of this important family of triplet-emitting polymers. The red shift in the absorption features upon coordination of the metal groups is consistent with there being an increase in conjugation length over the molecule through the metal center. The trade-olf relationship between the phosphorescence parameters (such as emission wavelength, quantum yield, rates of radiative and nonradiative decay) and the optical gap will be formulated. For systems with third-row transition metal chromophores in which the ISC efficiency is close to 100%,76-78 the phosphorescence radiative (kr)y, and nonradiative (/cm)p decay rates are related to the measured lifetime of triplet emission (tp) and the phosphorescence quantum yield ([Pg.300]

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