Extended analysis of the high resolution spectrum of C2H6 near 7 μm: the ν6, ν8, ν4 + ν12, 2ν4 + ν9 vibrational system, and associated hot transitions

The room temperature high resolution infrared spectrum of C2H6 between 1330 and 1610 cm−1, the region of the ν6 and ν8 fundamentals, has been re-investigated owing to the relevance of this spectral region in atmospheric and planetary applied research. The assignments of transitions from the ground vibrational state to the upper states ν6, ν8, ν4 + ν12 and 2ν4 + ν9 (4592 in total) and from the lower state ν4 to the upper state ν4 + ν8 (1090 lines) have been considerably extended with respect to our previous work [F. Lattanzi, C. di Lauro and J. Vander Auwera, J. Mol. Spectrosc. 248 (2008) 134–145], especially for the hot transitions. In particular, three new series of perturbation activated transitions were found, with ΔK = ±2, made observable by the resonance of the type l(Δl = ±2, ΔK = ∓1) within ν8. Also, new P-transitions to ν6 were found, made observable by the x,y-Coriolis resonance with ν8, at the values of K from 15 to 18. The extension of the assignments in the high frequency wing of ν8 and their ...