(slide 3/21)
(slide 4/21)
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As a means of introducing the field of Spectroscopy, the Electromagnetic Spectrum
is shown to illustrate the different wavelengths (energies) that are involved. In various types of spectroscopic
analysis, a beam of energy (e.g., photons, electrons) is focused onto a diamond (or other substance) and interacts
with the physics and chemistry of the compound. The resulting emission of energy due to scattering and absorption
of the impinging energy is measured. This is indicative of various processes occurring within the diamond. The
focusing of the energy can be done with a lens system or by use of a laser. Such analysis is non-destructive and
can be used for identification of properties within the diamond. (Fig. 3) (slide 3/21) |
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This slide elaborates on some of the different types of spectroscopy that are
used in diamond research. Cathodoluminescence (abbrev. CL; wavelengths in the visible region) is commonly used
to discern zonations in diamond, as these reflect upon the growth ancestry of the diamond in the mantle. Infrared
spectroscopy, more commonly referred to as FTIR due to a Fourier Transformation of the signal, examines spectra
just above the visible region. Such analyses are particularly useful for determination of nitrogen-aggregation
in diamond, as will be discussed below. Raman spectroscopy is used to identify solid and fluid inclusions both
on the surface and deep within diamonds, both qualitatively and quantitatively using a non-destructive laser beam
of @1 micron spot size (micron = mm = micrometer = 10-6 mm). (Fig. 4) (slide 4/21) |
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