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SINGLET OXYGEN LUMINESCENCE SPECTRA: A COMPARISON OF INTERFEROMETER‐ AND GRATING‐BASED SPECTROMETERS
Author(s) -
Wessels Jurina M.,
Charlesworth Paul,
Rodgersf Michael A. J.
Publication year - 1995
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1995.tb08621.x
Subject(s) - monochromator , interferometry , grating , optics , spectral resolution , michelson interferometer , spectrometer , astronomical interferometer , spectrograph , signal (programming language) , luminescence , fourier transform , physics , spectral line , wavelength , computer science , quantum mechanics , astronomy , programming language
— The current trend in methodology for determining IR and near‐IR absorption spectra is to employ interferometer‐based instruments to replace the monochromator‐based devices used heretofore. As a dispersion element, the interferometer offers major improvements in spectral resolution (Connes advantage), light throughput (Jacquinot advantage) and data acquisition through multiplexing (Felgett advantage). We have compared signal‐to‐noise (S/N) ratios of grating‐based and interferometer‐based instruments for making spectral determinations of near‐IR luminescence. Our results show that under identical excitation and detector conditions the interferometer instrument easily outperforms the grating, giving a 10‐fold improvement in S/N at high signal amplitude (A 488nm = 0.97) and a 20‐fold improvement when the signal amplitude is low (A 488nm = 0.06). Although some spectral resolution is sacrificed when scan times on the Fourier transform (FT)IR are significantly shortened, the S/N ratio was found only to decrease by a factor of 2 for a 10‐fold decrease in scan time. This adds to the advantages of the FT1R technique because the S/N will thus improve for the same total acquisition time.