Absolute line intensities for oxirane in the 11.4 μm spectral region.

Absolute individual line intensities of numerous transitions of the fundamental ν15, ν12and ν5bands of oxirane (ethylene oxide, cyc-C2H4O) have been measured in the 750–950 cm−1region using eight high-resolution Fourier transform spectra recorded at 0.002 cm−1resolution and various pressures. These line intensities were least-squares fit using a theoretical model which takes into account the vibration–rotation interactions linking the upper state rotational levels and, therefore, accurate rotational expansions of the transition moments of the ν15, ν12and ν5vibrational bands were derived. Using the coefficients obtained in the fitting, a line list has been generated and used to perform comparisons with the present measurements. Also, comparisons with measurements taken at medium–low resolution of the ν15/ν12/ν5system show excellent agreement. [ABSTRACT FROM PUBLISHER]