Radiation transfer

Eesley G L 1978 Coherent Raman spectroscopy J. Quant. Spectrosc. Radiat. Transfer 22 507-76... 

Chidsey I L and Crosley D R 1980 Calculated rotational transition probabilities for the A-X system of CH J. Quant. Spectrose. Radiat. Transfer 23 187-99... 

Dieke G H and Crosswhite H M 1963 The ultraviolet bands of CH fundamental data J. Quant. Spectres. Radiat. Transfer 2 97-199... 

Radiation transfer is largely eliminated when an insulant is placed in close contact with a hot surface. Radiation may penetrate an open-cell material but is rapidly absorbed within the immediate matrix and the energy changed to conductive or convective heat flow. It is also inhibited by the use of bright aluminum foil, either in the form of multi-corrugated sheets or as outer facing on conventional insulants. 

Radiation arrives at a grey surface of emissivity 0.75 al a constant temperature of 400 K, at the rate of 3 kW/m2. What is the radiosity and the net rate of radiation transfer to the surface What coefficient of heat transfer is required to maintain the surface temperature at 300 K if the rear of the surface is perfectly insulated and the front surface is cooled by convective heat transfer to air at 295 K ... 

Lightman A., Ben-Reuven A. Line mixing by collisions in the far-infrared spectrum of ammonia, J. Chem. Phys. 50, 351-3 (1969) Cross relaxation in the rotational inversion doublets of ammonia in the far infrared, J. Quant. Spectrosc. Radiat. Transfer 12, 449-54 (1972). 

Hooymayers HP, Alkemade CTJ (1966) Quenching of excited alkali atoms and related effects in flames Part II. Measurements and discussion. J Quant Spectrosc Radiat Transfer 6 847-874... 

Jongerius MJ, Van Bergen ARD, Hollander T, Alkemade CTH (1981) An experimental study of the collisional broadening of the Na-D lines by Ar, N2 and H2 perturbers in flames and vapor cells—I. The line core. J Quant Spectrosc Radiat Transfer 25 1-18... 

L Herman, J Akriche, H Grenat. J Quant Spectrosc Radiat Transfer 2 215-224, 1962. 

Energy transfer quenching. If an impurity is present whose first excited singlet state is below that of the excited state of the analyte then energy can be transferred to the impurity and fluorescence is not seen. This does not have to involve collision and non-radiation transfer can occur. Aromatic molecules are particularly a source of this interference. Removal is an option but sometimes dilution is a solution if the desired fluorescence can still be measured at lower concentration. 

Furthermore, it should be emphasized that the absence of radiation has been assumed. Incorporating radiation transfer is not difficult if one assumes that the radiant intensity of the emitters is known and that no absorption occurs between the emitters and the vaporizing surfaces, that is, it can be assumed that qr, the radiant heat flux to the surface, is known. Then Eq. (6.43) becomes... 

Note that using these assumptions does not make the mathematical solution of the problem significantly more difficult, for again, qr—and hence radiation transfer—is a known constant and enters only in the boundary condition. The differential equations describing the processes are not altered. 

When a photon is absorbed or emitted, energy is gained or lost by electrons within the substance. The photons in high frequency radiation transfer greater amounts of energy than photons in low frequency radiation. 

Castro, T L. G. Ruiz-Suarez, J. C. Ruiz-Suarez, M. J. Molina, and M. Montero, Sensitivity Analysis of a UV Radiation Transfer Model and Experimental Photolysis Rates of NO, in the Atmosphere of Mexico City, Atmos. Environ., 31, 609-620 (1997). Crosley, D. R., Rotational and Translational Effects in Collisions of Electronically Excited Diatomic Hydrides, J. Phys. Chem., 93, 6273-6282 (1989). 

Freckleton, R. S., S. Pinnock, and K. P. Shine, Radiative Forcing of Halocarbons A Comparison of Line-by-Line and Narrow-Band Models Using CF4 as an Example, J. Quant. Spectrosc. Radiat. Transfer, 55, 763-769 (1996). 

Goldstein, R., and S. S. Penner, Transmission of Infrared Radiation through Liquid Water and through Water Vapor near Saturation, J. Quant. Spectrosc. Radiat. Transfer, 4, 359-361 (1964). 

A very important bimolecular deactivation process is the electronic energy transfer (ET). In this process, a molecule initially excited by absorption of radiation, transfers its excitation energy by nonradiative mechanism to another molecule which is transparent to this particular wavelength. The second molecule, thus excited, can undergo various photophysical and photochemical processes according to its own characteristics. 

We consider the non-LTE spectral formation in a spherically expanding atmosphere. The velocity field v(r) is specified in its supersonic part by the usual analytical law with the parameters y, (final velocity) and the exponent 8=1, The temperature structure is derived from the assumption of radiative equilibrium, but only approximately evaluated for the grey LTE case. The atmosphere is assumed to consist of pure helium. The model atom has a total of 28 energy levels, among these 17 levels of He I. The line radiation transfer is treated in the "comoving frame". 

Hamann, W.-R. 1987, in "Numerical Radiation Transfer", W. Kalkofen (ed.), Cambridge University Press (in press)... 

Model calculations performed during PAUR I included three-dimensional regional Chemistry-Transport Models to study chemical processes and transport at the regional and the urban level and radiation transfer models. These models were applied for a number of ozone depletion scenaria. 

At the end of the fifties, Ya.B. gave a qualitative picture of the structure of shock waves with radiation transfer taken into account [20], In front of a compression shock there is a layer heated by radiation from the compressed gas. Behind the discontinuity there is a temperature peak. The simultaneously developed quantitative theory of these effects allowed detailed explanation of the experimentally observed patterns of luminescence of the front in strong shock waves and of the radiation in the early stage of a fire ball in... 

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