Determination of line strengths by Fourier-transform spectroscopy.

A rigorous test of the photometric accuracy of commercial high-resolution Fourier transform spectrometers has been made by measuring line strengths in the pure rotational spectrum of carbon monoxide. Measurements have been made with a Bruker IPS 120 HR spectrometer (transitions: J″ = 7 . . . 23) and a Bomen DA3.002 spectrometer (J″ = 27 . . . 35). A least-squares fit of individual data sets and the combined data gave permanent electric dipole moments in the range 0.1091-0.1101 D and quadratic Herman-Wallis factors in the range -0.188 to -0.229 × 10(-3), in good agreement with literature values within the overall uncertainty. Sources of systematic errors in the Fourier-transform spectrometer and in the algorithms used to reduce the data are discussed in detail. The experimental results show that such errors affected the retrieved line strengths by less than 1%.

[1]  R. H. Tipping,et al.  Vibration-rotational and rotational intensities for CO isotopes , 1983 .

[2]  J. W. C. Johns,et al.  Absolute intensity and pressure broadening measurements of CO2 in the 4.3-μm region , 1987 .

[3]  J. Watson.  Quadratic Herman-Wallis factors in the fundamental bands of linear molecules , 1987 .

[4]  J. Watson.  Forbidden rotational spectra of polyatomic molecules , 1971 .

[5]  P Saarinen,et al.  Line-shape distortions in misaligned cube corner interferometers. , 1992, Applied optics.

[6]  J. Johns,et al.  High resolution and the accurate measurement of intensities , 1987 .

[7]  P. Wyder,et al.  Spectrum distortion in far-infrared Fourier spectroscopy by multiple reflections between sample and Michelson interferometer , 1980 .

[8]  G. Guelachvili,et al.  CO 1-0 band isotopic lines as intensity standards , 1983 .

[9]  J. Muenter,et al.  Electric dipole moment of carbon monoxide , 1975 .

[10]  S. R. Drayson.  Rapid computation of the Voigt profile , 1976 .

[11]  C. Webster.  Stratospheric composition measurments of Earth and Titan using high-resolution tunable diode laser spectroscopy , 1988 .

[12]  R. C. Weast.  CRC Handbook of Chemistry and Physics , 1973 .

[13]  R. May.  Line intensities and collisional-broadening parameters for the v4 and v6 bands of carbonyl fluoride , 1992 .

[14]  R. F. Wallis,et al.  Influence of Vibration‐Rotation Interaction on Line Intensities in Vibration‐Rotation Bands of Diatomic Molecules , 1955 .

[15]  V. M. Devi,et al.  THE HITRAN MOLECULAR DATABASE: EDITIONS OF 1991 AND 1992 , 1992 .

[16]  J. J. Remedios,et al.  The effect of sample emission on measurements of spectral parameters using a fourier transform absorption spectrometer , 1992 .

[17]  R. Tipping.  Vibration-rotation intensities for “hot” bands☆ , 1976 .