Experimental Determination of Line Strengths for Selected Carbon Monoxide and Carbon Dioxide Absorption Lines at Temperatures between 295 and 1250 K

Abstract

Fourier transform infrared absorption spectroscopy has been used for the determination of the line strengths of 41 CO and CO2 absorption lines at temperatures between 295 and 1250 K. The CO vibrational-rotational lines were from the P branch of the fundamental absorption band (2150–1950 cm−1) while the CO2 vibrational-rotational lines were from the far wing of the R branch of the v3 fundamental band (2395–2380 cm−1). The intensities of the lines were measured from absorption spectra recorded in a high-temperature gas cell containing known concentrations of CO/CO2/N2 gas mixtures at atmospheric pressure. Absorption spectra were recorded through the cell with the use of a moderate-resolution Fourier transform infrared spectrometer. The absorption spectra were mathematically corrected for distortions resulting from the finite resolution of the spectrometer and for peak overlap. Line strength measurements were made from the corrected peaks by using the Bouguer-Lambert law and assuming a Lorenztian line profile. The experimentally obtained line strengths were evaluated (1) by statistical calculations, (2) by consideration of the validity of the Bouguer-Lambert assumption for these data, (3) by comparison with existing room-temperature and high-temperature data, and (4) by comparison with theoretical calculations. For CO, the statistical analysis suggests that the reported values have an uncertainty of ±10–12%, which is similar to the observed discrepancies with other reported values at room temperature. At high temperatures, the difference between these data and previously reported data and theoretical predictions is less than 10%. For CO2, the statistical uncertainty associated with the line strength calculations is less than 5%, which is also the approximate level of agreement with existing room-temperature data. For lines with m indicies of 65–89, at high temperatures, the values reported in this work agree within 5 to 10% of theoretical calculations.

The Dithiolate-Bridged Diiron Hexacarbonyl Complex Na2[(μ-SCH2CH2COO)Fe(CO)3]2 as a Water-Soluble PhotoCORM

“…As tabulated by Medvecz 20 . The equation used is S(m) = , where S(m) refers to the line strength, A(ν 0 ) refers to the absorbance intensity, γ(m) refers to the width at half length, L refers to the path length and C refers to the amount of CO present in atm.…”

“…We have used FTIR spectroscopy to quantify CO by monitoring its gas-phase rovibrational spectrum in the headspace above the aqueous solution 10,20 . The headspace was directly connected to a 15cm-long gas cell equipped with CaF 2 windows for IR transmission.…”

“…Figure 3 shows a typical spectrum of the CO fundamental band centered at ν o = 2143cm -1 . As the line strength of each rovibrational line has been determined accurately, the concentration of CO can be calculated directly using the following equation 20 :…”

Methanol and Ethanol Fuels in Solid Oxide Fuel Cells: A Thermal Imaging Study of Carbon Deposition

“…Band peak absorbances were determined from the spectra and converted to partial pressures using intensity coefficients obtained from literature standard spectra. 4,5 The calculated partial pressures for each species are shown SI1. The partial pressure of C 2 H 5 OH in the fuel stream prior to the furnace is 59.3 Torr.…”

Infrared emission spectroscopy of CO2 at high temperature. Part I: Experimental setup and source characterization

“…Rosenmann et al [3,4] have performed such measurements in the 4.3 µm region up to 800 K, and Mihalcea et al [5] investigated the 2 µm region in order to determine the most suitable absorption lines to be used as a diagnostic tool in combustion applications. André et al [6] have measured CO 2 absorption spectra in the range 3700-3750 cm −1 using high resolution Fourier transform infrared (FTIR) spectroscopy and optical paths of about 2 m up to 700 K. Lower spectral resolution FTIR measurements were performed by Parker et al [7] around 12 µm up to 800 K and by Medvecz et al [8] who measured absorption spectra of CO/CO 2 /N 2 mixtures up to 1250 K in the 4.3 µm region. Phillips [9] has also performed FTIR measurements in the 4.3 µm region up to 1000 K with 0.06 cm −1 spectral resolution and has derived band model parameters from the experimental data.…”