Measurements of the HCN ν3 band broadened by N2 |
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Authors: | MAH Smith GA Harvey GL Pellett A Goldman DJ Richardson |
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Institution: | NASA Langley Research Center, Hampton, Virginia 23665 USA;Department of Physics, University of Denver, Denver, Colorado 80208 USA;Systems and Applied Sciences Corporation, Hampton, Virginia 23666 USA |
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Abstract: | N2-broadened halfwidths have been measured for 51 absorption lines belonging to the ν3 fundamental band of hydrogen cyanide (1H12C14N) near 3311 cm?1. The data were recorded at room temperature using a Fourier transform spectrometer with a nominal resolution of 0.06 cm?1. A nonlinear least-squares spectral-fitting procedure was used to obtain both line intensities and collision-broadened halfwidths from scans recorded at several different pressures. The N2-broadened halfwidths, determined for all lines with J ≤ 25 in both the P and R branches of the band, show the expected distribution with J for broadening by a nonpolar gas. The halfwidth values range from approximately 0.17 cm?1 atm?1 near the band center to 0.11 cm?1 atm?1 for high-J lines. The band intensity for the ν3 fundamental derived from these measurements is 236.2 ± 9.5 cm?2 atm?1 at 296 K, and empirical coefficients for the vibration-rotation interaction F-factor were also determined. |
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