2010
DOI: 10.1063/1.3326342
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Reconciling FTIR Spectroscopy with Top-off Operations at the Advanced Light Source

Abstract: Abstract. Top-off operations is a quasi-continuous injection mode that increases the flux and brightness of a synchrotron source and improves thermal stability of optical components by maintaining a constant current in the storage ring. Although the increased and constant flux is advantageous for FTIR measurements, the frequent injections (about one every 30 seconds in the ALS case) introduce artifacts into the spectrum by creating spikes in the interferogram data. These spikes are caused by brief beam motion … Show more

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Cited by 3 publications
(3 citation statements)
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“…Although broadband IR laser source development continues, synchrotron IR radiation is currently the only source with the combined spectral irradiance, spectral coverage, and high repetition rate to measure near-field spectra over the entire mid-IR range within a single acquisition. In addition to the tip enhancement, the high sensitivity is achievable because of several advantages of the source, including minimal shot-to-shot fluctuations, high long-term power stability arising from top-off mode operations (48), and the exceptionally stable spectral distribution. These advantages enable effective signal averaging over minutes to hours, if necessary.…”
Section: Perspective and Summarymentioning
confidence: 99%
“…Although broadband IR laser source development continues, synchrotron IR radiation is currently the only source with the combined spectral irradiance, spectral coverage, and high repetition rate to measure near-field spectra over the entire mid-IR range within a single acquisition. In addition to the tip enhancement, the high sensitivity is achievable because of several advantages of the source, including minimal shot-to-shot fluctuations, high long-term power stability arising from top-off mode operations (48), and the exceptionally stable spectral distribution. These advantages enable effective signal averaging over minutes to hours, if necessary.…”
Section: Perspective and Summarymentioning
confidence: 99%
“…The best solution is to reduce the magnitude of the perturbation until it is insignificant. If this is not possible, then some other remedy must be devised [26]. For example, one could omit from the final interferogram average each small ''bad" section in all individual interferograms, which would be flagged by a signal from the machine control electronics.…”
Section: The Storage Ring and Beamlinementioning
confidence: 99%
“…7. This spectrum shows pure rotational transitions of N 2 Oi n a range around 18 cm À1 covering transitions from R(11) to R (26). It was obtained with an absorption path of 6 m and a pressure of 1 Torr.…”
Section: Coherent Srmentioning
confidence: 99%