By Roger Chesneau
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Of their contribution to the 1st variation of this guide, entitled "The Teeth," LEHNER and PLENK (1936) mentioned the tissues constituting the "perio dontium" relatively in brief. not like the specified paragraphs facing, for instance, tooth and dentine, the part (about forty pages and 20 illustra tions, commonly drawings) dedicated to periodontal tissues did not supply a authentic evaluation and precis of the modern wisdom and most up-to-date advancements in examine at the a variety of parts of the periodontium.
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These spectral distinctions between molecules may persist for periods that are long compared with the observation time. LUMINESCENCE OF ORGANIC MOLECULES 23 Conventional broad-band optical excitation of such systems might simultaneously excite all the various types of molecules, but a narrow-band laser may only excite a special subset whose energies are shifted into resonance with the laser by their interactions with the medium. Thus the fluorescence spectrum may change as the excitation frequency is shifted, and it may have considerably narrower bands than those obtained by conventional techniques.
Raman Spectrosc. 2, (3) 275 (1974). Berne, B. , Dynamic Light Scattering with Applications To Chemistry, Biology, and Physics, Wiley, New York (1976). ,Nonlinear Optics, W. A. Benjamin, New York (1977). Burns, M. , Lin, W. , and Zewail, A. , Nonlinear laser spectroscopy and dephasing of molecules: An experimental and theoretical overview, in Spectroscopy and Excitation Dynamics of the Molecular Condensed Phase, a series in Modern Problems in Solid State Physics (V. M. Agranovich and R. M. ), North-Holland, Amsterdam (1982).
This hot luminescence can be useful since it provides information about vibrational-relaxation pathways and relaxation times. The nonequilibrium luminescence becomes more important as shorter and shorter time resolution is used in luminescence experiments. In principle the radiative lifetime can be used as an internal clock to gauge the time that optically excited systems take to relax to equilibrium. The basic point is that, to a good approximation, the radiative lifetime is independent of the nature of the vibrational excitation.
Aeroguide 20 - McDonnell Douglas F-18A Hornet by Roger Chesneau