Mass-correlated rotational Raman spectra and the structure of furan

Abstract

We present mass-correlated rotational alignment spectroscopy and the first high-resolution rotational Raman spectra for furan. Spectra were measured with a spectral range up to 0.5 THz and a resolution down to 1.6 MHz. Spectra for 13C and 18O isotopologues were observed in their corresponding mass channels at natural abundance. Based on our data and literature constants, we performed a purely experimental structure analysis for the effective and equilibrium structures of furan. The results highlight the utility of CRASY to obtain rare isotopologue spectra without isotopically enriched samples. Mass-correlated rotational Raman spectra were observed for furan and its 13C and 18O isotopologues at natural abundance. Measurements were performed in a mass spectrometer, using time-delayed laser pulses for impulsive excitation and subsequent photoionization of a rotational wave packet. A rotational resolution up to 1.6 MHz was achieved by scanning an extended pump-probe delay range up to 1 mu$$ \upmu $$s. The data were used to perform a purely experimental structure analysis of furan. image