Abstract
new experimental setup, combining a custom-designed Schwarzschild-type Cassegrain-based microscope and an ultraviolet-visible-near infrared
(UV-Vis-NIR) spectrophotometer, has been developed, focusing the light
beam down to 20 μm diameter. Optical absorption spectra (in the 300–2500
nm range) have been measured on micrometer-sized natural glass
inclusions providing information on iron speciation in magmatic melts.
The absence of contribution from the host crystal matrix provides a test
of the efficiency of micro-focusing. A microthermometric stage has been
adapted on the microscope for measuring optical absorption spectra up
to 900 K with application to the thermochromism of minute natural spinel
crystals (MgAl2O4:Fe2+,Cr3+).
This experimental setup provides an easy and fast way to follow the
evolution of spectral properties and color of glasses or crystals with
temperature as well as the possibility of measuring spatially resolved
optical absorption spectra.
Original language | English |
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Pages (from-to) | 457-463 |
Number of pages | 7 |
Journal | Applied Spectroscopy |
Volume | 69 |
Issue number | 4 |
DOIs | |
Publication status | Published - Apr 2015 |
Externally published | Yes |
Keywords
- Cassegrain microscope
- Glass inclusions
- Microspectrophotometry
- OAS
- Optical absorption spectroscopy
- Spinel
- Temperature
- UV-Vis-NIR spectroscopy
- Ultraviolet-visible-near-infrared spectroscopy