Optical Absorption Microspectroscopy (μ-OAS) Based on Schwarzschild-Type Cassegrain Optics

被引:10
作者
Chasse, Mathieu [1 ]
Lelong, Gerald [1 ]
van Nijnatten, Peter [2 ]
Schoofs, Ivo [2 ]
de Wolf, Jurgen [2 ]
Galoisy, Laurence [1 ]
Calas, Georges [1 ]
机构
[1] Univ Paris 06, Inst Mineral Phys Mat & Cosmochim, Sorbonne Univ, CNRS UMR 7590,IRD UMR 206,Museum Natl Hist Nat, F-75005 Paris, France
[2] OMT Solut BV, NL-5656 AE Eindhoven, Netherlands
关键词
Optical absorption spectroscopy; OAS; Ultraviolet-visible-near-infrared spectroscopy; UV-Vis-NIR spectroscopy; Microspectrophotometry; Cassegrain microscope; Glass inclusions; Temperature; Spinel; VISIBLE MICROSPECTROSCOPY; SILICATE-GLASSES; IRON; INCLUSIONS; MINERALS; SAMPLES; MELTS;
D O I
10.1366/14-07628
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
A 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 AM 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 spine! 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.
引用
收藏
页码:457 / 463
页数:7
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