Vibration-rotation-torsion analysis of the high resolution infrared spectrum of C2H6 between 1330 and 1610 cm−1: The ν6, ν8, ν4 + ν12, 2ν4 + ν9 interacting system and hot transitions from ν4 to ν4 + ν8

Several hot transitions originating from the v4 = 1 torsional state have been observed. An analysis of 294 line positions belonging to the (ν4 + ν8) − ν4 hot band has been performed, leading to a fit with a RMS deviation of 5.1 × 10−3 cm−1. It is shown that a complex network of l-type resonances is also active in the ν4 + ν8,2ν4 + ν12 system.