Determination of molecular line parameters for acrolein (C3H4O) using infrared tunable diode laser absorption spectroscopy |
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Authors: | Charles N Harward Sr W David Thweatt Randall E Baren Milton E Parrish |
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Institution: | aNottoway Scientific Consulting Corporation, 10379 East Colonial Trail Highway, Nottoway, VA 23930, USA;bPhilip Morris USA Post Graduate Research Program, 4201 Commerce Road, Richmond, VA 23234, USA;cPhilip Morris USA, Research Center, 4201 Commerce Road, Richmond, VA 23234, USA |
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Abstract: | Acrolein (C3H4O) molecular line parameters, including infrared (IR) absorption positions, strengths, and nitrogen broadened half-widths, must be determined since they are not included in the high resolution transmission (HITRAN) molecular absorption database of spectral lines. These parameters are required for developing a quantitative analytical method for measuring acrolein in a single puff of cigarette smoke using tunable diode laser absorption spectroscopy (TDLAS). The task is complex since acrolein has many highly overlapping infrared absorption lines in the room temperature spectrum and the cigarette smoke matrix contains thousands of compounds. This work describes the procedure for estimating the molecular line parameters for these overlapping absorption lines in the wavenumber range (958.7–958.9 cm−1) using quantitative reference spectra taken with the infrared lead-salt TDLAS instrument at different pressures and concentrations. The nitrogen broadened half-width for acrolein is 0.0937 cm−1 atm−1 and to our knowledge, is the first time it has been reported in the literature. |
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Keywords: | Acrolein Cigarette smoke Ethylene Pressure broadened half-width Tunable diode laser spectroscopy |
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