By Jose Solé, Luisa Bausa, Daniel Jaque
This functional consultant to spectroscopy and inorganic fabrics meets the call for from academia and the technology group for an introductory textual content that introduces the various optical spectroscopic ideas, utilized in many laboratories, for cloth characterisation.
- Treats the main uncomplicated features to be brought into the sphere of optical spectroscopy of inorganic fabrics, allowing a scholar to interpret basic optical (absorption, reflectivity, emission and scattering) spectra
- Contains basic, illustrative examples and solved exercises
- Covers the idea, instrumentation and purposes of spectroscopy for the characterisation of inorganic fabrics, together with lasers, phosphors and optical fabrics resembling photonics
This is a perfect beginner’s consultant for college kids with a few prior wisdom in quantum mechanics and optics, in addition to a reference resource for pros or researchers in fabrics technological know-how, particularly the starting to be box of optical materials.
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Additional resources for An Introduction to the Optical Spectroscopy of Inorganic Solids
4 LUMINESCENCE Luminescence is, in some ways, the inverse process to absorption. We have seen in the previous section how a simple two-level atomic system shifts to the excited state after photons of appropriate frequency are absorbed. This atomic system can return to the ground state by spontaneous emission of photons. This de-excitation process is called luminescence. However, the absorption of light is only one of the multiple mechanisms by which a system can be excited. In a general sense, luminescence is the emission of light from a system that is excited by some form of energy.
In fact, the reﬂectivity, R(ν), and the absorption spectra, α(ν), can be interrelated by using the so-called Kramers–Kr¨onig relations (Fox, 2001). 12) where I R is the reﬂected intensity. Reﬂectivity spectra can be registered in two different modes: (i) direct reﬂectivity or (ii) diffuse reﬂectivity. Direct reﬂectivity measurements are made with well-polished samples at normal incidence. Diffuse reﬂectivity is generally used for unpolished or powdered samples. 7 shows the experimental arrangements for measuring both types of spectra.
14(b)). The main line corresponds to Rayleigh scattered light, while the WY062-Sole 30 January 5, 2005 11:28 Char Count= 0 FUNDAMENTALS 239 IS (Arb. 15 The Raman spectrum of lithium niobate at room temperature. 14(c). This spectrum has the following particular properties: (i) The Ωi are the characteristic frequencies of the substance (in case of solids, they correspond to phonon frequencies). 14(c)) are always at frequencies located that are symmetrically to both sides of the main line (Rayleigh line) at ω0 .