The Rapid Measurement of Spectral Intensity with an Oscillating Fabry-Perot Spectrometer: Isotope Abundance in Mercury
Journal Article
·
· Proceedings of the Royal Society. A. Mathematical, Physical and Engineering Sciences
A high-resolution photoelectric spectrometer employing a mechanically scanned Fabry-- Perot interferometer is described. The spectrometer produces high-finesse spectral profiles continuously and rapidly at repetitive frequencies of up to 1000 c/s corresponding to a time resolving limit of 4 mu s for a scan of 5 orders. The display is on an oscilloscope or a pen-recorder function plotter. The instrument was tested with the high-frequency discharge spectrum of mercury. Single intensity measurements are reproducible to better than 0.5%. The wavelength scale is linear to 0.5% over an order and can be corrected to four times this accuracy. Hyperfine structures agree well with recent determinations which use both pressure scanned and photographic Fabry--Perot systems. The mercury isotope abundances were obtained from the spectral intensity measurements agreeing well with mass spectrometer values. The rms deviation for a single determination is less than 0.5% of the percentage abundance. Possible applications to rapidly varying phenomena in gas discharges and shock waves, the determination of refractive indices and extension to the ultraviolet region for spectroscopy from an earth satellite are briefly considered.
- Research Organization:
- Univ. of London
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-15-027822
- OSTI ID:
- 4838869
- Journal Information:
- Proceedings of the Royal Society. A. Mathematical, Physical and Engineering Sciences, Journal Name: Proceedings of the Royal Society. A. Mathematical, Physical and Engineering Sciences Journal Issue: 1311 Vol. 262; ISSN 1364-5021
- Publisher:
- The Royal Society Publishing
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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