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Pure Appl. Chem.,
Vol. 70, No. 10, pp. 2039-2045, 1998
PHYSICAL
CHEMISTRY DIVISION
COMMISSION ON MOLECULAR STRUCTURE AND SPECTROSCOPY*
Specification of Components, Methods
and Parameters in Fourier Transform Spectroscopy by Michelson and Related
Interferometers
(Technical Report)
Back to Index - Introduction
- List A - List C
LIST B: For Fourier Transform Spectroscopy at High
Resolution
The following should be specified in all papers when relevant
or should be deducible directly from other information in the paper
or in specifically cited references.
- The instrument type, its manufacturer and model number.
- The sample, its purity and how this was determined, the method of
sampling.
- Identified line width contributions due to the Doppler effect,
pressure broadening, or other sample properties.
- How water and carbon dioxide were removed from the optical path.
- Wavenumber calibration: Conditions used for calibration spectra
and source of calibration reference data.**
- Signal-to-noise ratio: Value at peak background energy in an absorption
measurement, or maximum recorded value in an emission measurement,
or equivalent information.
- The radiation source.
- The beamsplitter used and its useful wavenumber range.
- Optical filters used, their range and temperature.
- The detector,and its temperature, D* value, and wavenumber
range.
- Step scan or continuous scan.
- The optical retardation velocity (for continuous scan).
- Whether the interferogram was one-sided or two-sided.
- The total elapsed time for measurement AND the efficiency of the
measurement cycle; OR equivalent information including the number
of scans or, for step-scan systems, the integration time at each point.
- The digitization (sampling) interval, dx, or the alias bandpass,
dx-1, after any digital filtering.
- The maximum optical path difference in the interferogram, Xmax
OR the nominal resolution defined as 1/Xmax.
- The apodization function used.
- The diameter, d, of the limiting aperture of the spectrometer.
- The focal length, F, of the collimating mirror.
- The wavenumber interval between original calculated spectral points.
- Characteristics of electronic filters used.
- Characteristics of digital filters used.
The following should also be specified when quantitative significance
is claimed for absolute or relative intensities or lineshapes
- The Fourier transform algorithm used, e.g., Cooley-Tukey, variable
radix, or other.
- The type of phase correction used, e.g., multiplicative or convolution.
- The type of spectrum calculated from the Fourier transform, e.g.,
phase corrected amplitude spectrum or magnitude spectrum (in which
zero baseline noise is all positive).
- Information about the linearity of cooled detectors, if used.
- Details of any arithmetic processing of the spectra after Fourier
transformation and phase correction, including the use of a reference
spectrum to calculate the transmittance or absorbance spectrum.
** e.g., Guy Guelachvili and 23 others,
Pure and Applied Chemistry 68, 193 (1996); reprinted in
J. Molecular Spectroscopy 177, 164 (1996) and in Spectrochimica
Acta 52, 717 (1996).
Back to Index - Introduction
- List A - List C
Page last modified 1 June 1999.
Copyright ©1997, 98,99 International Union of Pure and Applied Chemistry.
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