Abstract
A new hot band spectrum of ethylene has been recorded from 2970 to 3015 cm−1at low rotational temperatures in a seeded molecular jet, using vibrational energy transfer from SF6to C2H4. An IR–IR double resonance technique has been applied to pump the lower states and subsequently probe the hot bands. Two new hot bands, ν10+ ν11− ν10and ν7+ ν11− ν7, have been found. The weak hot band starting from ν7has been identified by direct labeling of some rotational levels in the ν7manifold. High resolution FTIR spectra at ambient and at elevated temperatures have been recorded, too; it has thus become possible to extend the analysis to higher rotational quantum numbers. The previously analyzed ν9+ ν10level has been reinvestigated and ab-type Coriolis interaction with the nearby ν7+ ν11state has been observed. Rotational energy levels of ν7+ ν11and of ν9+ ν10have been fitted simultaneously, taking into account the local perturbations due to five dark states. From the shift of allK≠ 0 levels to higher frequencies in the ν10+ ν11state, a globala-type Coriolis interaction with ν8+ 2ν12has been identified.
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