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High-Resolution Spectroscopy Using an Acousto-Optic Tunable Filter and a Fiber-Optic Fabry–Perot Interferometer

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A compact, solid-state, high-resolution spectrometer consisting of an acousto-optic tunable filter (AOTF) and a fiber-optic Fabry-Perot (FFP) interferometer has been developed. The system has been designed for high-resolution inductively coupled plasma atomic emission spectroscopy (ICP-AES) applications. A description of the AOTF-FFP and its performance is presented. The resolution of the AOTF-FFP was determined by measuring the physical widths of ICP emission lines using a 1.5-m-focal-length grating spectrometer and deconvoluting the physical line shapes from the acquired AOTF-FFP spectra. Over the optimum range of the FFP mirror coatings, the resolution is sufficient for the determination of isotopic and hyperfine emission features in ICP-AES experiments, and approaches that of the 1.5-m spectrometer. The application of the AOTF-FFP to the determination of uranium isotopes (U-235 and U-238) introduced into the ICP is presented.

Keywords: Acousto-optic tunable filter; Actinides; Fabry-Perot interferometry; High-resolution spectroscopy; Inductively coupled plasma atomic emission spectroscopy; Isotope emission; Physical linewidths

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702963906032

Affiliations: Ames Laboratory—USDOE, Ames, Iowa 50011

Publication date: April 1, 1996

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