FTIR Measurements of N(2)-Induced Pressure Broadening of Allene (C(3)H(4)) in the nu(10) Band.
Nitrogen pressure-broadening coefficients have been measured in the 841 cm(-1) nu(10) band of allene (H(2)C&dbond;C&dbond;CH(2)). The high-resolution absorption infrared spectra were recorded by a FTIR spectrometer at a temperature of 201 K. The Voigt line profile, convolved with a sinc instrument function, was applied to the fit of the observed rovibrational lines. No regular J or K dependence of the broadening coefficients was observed for this strong symmetric-top-molecule band. The power-exponential-gap (PEG) fitting law and the infinite-order-sudden (IOS) scaling law were modified for the fit of the N(2)-broadening coefficients. The wavefunction mixing arising from the nu(10)/nu(9) Coriolis resonance was taken into account for the IOS law. A total of 180 broadening coefficients measured at 201 K were reproduced with an accuracy of 8.6 and 7.9% by the PEG and IOS laws, respectively. Copyright 1999 Academic Press.
Wang
WF
Joint Center for Earth Systems Technology, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, Maryland, 21250
Sirota
JM
Reuter
DC