An Approximation to True Peak Absorbance from Observed Peak Absorbance for Gas Phase Fourier Transform Spectroscopy

An approximation is developed to yield true peak absorbance, A sub p, from observed peak absorbance, A sub obs, from gas phase infrared spectra obtained using low resolution Fourier transform spectroscopy employing triangular apodization of the interferogram. The approximation is of the form A sub p...

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Bibliographic Details
Main Authors: McNesby, Kevin L, Fifer, Robert A
Format: Report
Language:English
Subjects:
ABSORPTION SPECTRA
ASH43
Atomic and Molecular Physics and Spectroscopy
CONSTANTS
FOURIER SPECTROSCOPY
HEIGHT
INFRARED SPECTRA
INSTRUMENTATION
LOW RESOLUTION
PE61102A
PHASE TRANSFORMATIONS
RATIOS
RESOLUTION
SPECTRAL LINES
VAPOR PHASES
WIDTH
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Summary:An approximation is developed to yield true peak absorbance, A sub p, from observed peak absorbance, A sub obs, from gas phase infrared spectra obtained using low resolution Fourier transform spectroscopy employing triangular apodization of the interferogram. The approximation is of the form A sub p = k((A sub obs) ot the l power)(rho to the n power), where k, 1, and n constants and rho is equal to the ratio of the resolution of the instrument to twice the half width at half height of the absorbing line. Values of k, 1, and n are given as a function of A sub p and instrument resolution. Comparison is made with a previous approximation. Keywords: Peak absorbance correction, Gas phase, Low resolution, Absorption.