Garnets absorption spectra

Frentrup, K. R. Langer, K. (1981) Mn3+ in garnets optical absorption spectrum of a synthetic Mn3+-bearing silicate garnet. Neues Jahrb. Mineral. Mh., pp. 245-56. 

A fluorometric analysis results in the collection of two spectra, the excitation spectrum and the emission spectrum. The excitation spectrum should be the same as the absorption spectrum obtained spectropho tome trie ally. Differences may be seen due to instrumental factors, but these are normally small, as seen in Fig. 5.45, which shows the absorption and excitation spectra for Alizarin garnet R, a fluorometric reagent for aluminum ion and fluoride ion. The longest wavelength absorption maximum in the excitation spectrum is chosen as the excitation wavelength this is where the first monochromator is set to excite the sample. It would seem reasonable to choose the wavelength that... 

Figure 5.45 Absorption and fluorescence spectra of the aluminum complex with acid Alizarin garnet R (0.008%) Curve A, the absorption spectrum Curve B, the fluorescence excitation spectrum Curve C, the fluorescence emission spectrum. (From Guilbault, used with permission.)...

White, R. G., 1964. Handbook of Industrial Infrared Analysis. New York Plenum Press. Wickersheim, K. A., R. A. Lefever, and B. M. Hanking, 1960. Infrared absorption spectrum of the silicate ion in the garnet structure. J. Chem. Phys. 32 271. 

The technique of laser heating in a DAC is based on three main features optical transparency of diamond anvils the samples can be heated via the optical absorption of intense laser radiation, and the temperature can be determined from the thermal radiation spectrum of the heated sample using the Planck formula [10]. Laser radiation for heating of a sample in a DAC was first implemented by Ming and Bassett [11], who used a pulsed ruby laser, and a continuous-wave Nd-YAG (yttrium-aluminum-garnet) laser to heat samples in a DAC above 3300 K, and up to 2300 K, respectively. Today two types of continuous wave infrared (IR) lasers are extensively used in laser heating experiments Solid state lasers (Nd-doped YAG, or YLF (yttrium-lithium-fluorite) crystals with the most intense line at... 

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