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Large aperture cube corner interferometer with a resolution of 0.001 cm(-1)
Applied Optics
|August 12, 2010
Summary
The Fourier transform spectrometer at the University of Oulu has been upgraded, achieving a maximum instrumental resolution better than 10(-3) cm(-1). This enhancement significantly improves spectral analysis capabilities for various molecules.
Area of Science:
- Spectroscopy
- Optical Physics
- Analytical Chemistry
Background:
- The University of Oulu's Fourier transform spectrometer previously operated at a resolution of 4.5 x 10(-3) cm(-1).
- Advancements in instrumental design are crucial for high-resolution molecular spectroscopy.
Purpose of the Study:
- To enhance the instrumental resolution of the Fourier transform spectrometer.
- To improve the precision of spectral measurements for atmospheric and molecular gases.
Main Methods:
- Modification of the interferometer using large cube corner mirrors and a Mylar beam splitter.
- Construction of corner mirrors with three adjustable flat mirrors.
- Implementation of the upgraded interferometer for practical use.
Main Results:
- Achieved a maximum instrumental resolution better than 10(-3) cm(-1), a significant improvement over the previous 4.5 x 10(-3) cm(-1).
- Successfully recorded initial spectra of water (H2O), carbon dioxide (CO2), nitrous oxide (N2O), and carbonyl sulfide (OCS).
Conclusions:
- The modified Fourier transform spectrometer offers superior resolution for detailed spectral analysis.
- The enhanced instrument is suitable for precise measurements of molecular absorption bands in the infrared region.
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