Abstract
The ν12 e1u fundamental band of C6H6 has been recorded under collisionless low-temperature (≈10 K) molecular-beam conditions using bolometric detection of molecules excited by a linearscan-controlled color-center laser referenced to a dual-wavelength polarization-stabilized HeNe laser. The sub-Doppler instrumental linewidth of ≈12 MHz (full width at half-maximum) permits resolution of nearly every transition. Improved spectroscopic constants are obtained in a fit yielding a standard deviation of ≈2 MHz, reflecting the measurement precision. A weak anharmonic or parallel z-Coriolis perturbation is observed in the Kl = −5 and −6 sublevels and is attributed to a closely resonant, lower-lying high-order combination level.
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