Linestrengths of the nu(2) and nu(4) bands of (C-12)H4 and (C-13)H4

Statistics – Applications

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Absorption Spectra, Carbon Isotopes, Line Shape, Methane, Spectral Bands, Fourier Transformation, High Resolution, Spectrum Analysis

Scientific paper

Absorption spectra recorded on the high-resolution Fourier transform spectrometer at Kitt Peak National Observatory/National Solar Observatory were used to measure individual line strengths of the nu(2) and nu(4) bands of (C-12)H4 and (C-13)H4. The measurements were used to obtain expressions that could be used to correctly predict individual line strengths through five orders of magnitude of absorption strength and high values of J-prime. Transition strengths were modeled using the dyad formalism of two interacting bands and a seven-term second-order dipole-moment expansion. The successful fitting of these data indicates that the method can be used to model measurements of 2- to 5-percent precision even at high values of J. For remote sensing applications, the present prediction of the dyad spectrum represents a substantial improvement.

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