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| - Stark Shift of Rotational Lines in the UV Spectrum of the Charge-Transfer MoleculeBenzonitrile
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| - We present the resolved Stark splitting of rovibronic lines in the resonance enhanced multiphoton ionizationspectrum of benzonitrile caused by an electric field up to 700 V/cm. The Stark spectrum is theoreticallyreproduced yielding a value of 4.5(1) Debye for the dipole moment of the excited S1 state. The same valueis found from the Stark splitting of the 1band at an excess energy of 703 cm-1. The slight increase of thedipole moment compared to the ground-state value of 4.18 D and the absence of local perturbations in thespectra demonstrate that there is no detectable influence of the theoretically predicted charge-transfer statecaused by a rehybridization of the carbon atom in the cyano group. Our results further show that the presenceof electric fields during excitation can lead to a broadening of REMPI spectra and should be avoided inrotational resolution work on polar molecules.
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