Abstract
We report time-domain rotational spectroscopy of the ethylene dimer, (C2H4)2, by implementing time-resolved Coulomb explosion imaging. A molecular movie of rotational wave packets of the dimer has been captured with a delay time of up to 11 ns. Pure rotational spectrum of the cluster is obtained with frequency resolution of ∼ 120 MHz by Fourier transformation of the time trace of the alignment parameter. Rotational and centrifugal distortion constants are determined with much improved precision than the previous infrared studies. The present study demonstrates the capability of the newly developed time-domain approach in rotational spectroscopy of weakly bound nonpolar clusters.
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