Geometry of 2,5-dihydrofuran from the free jet rotational spectra of the 13C and 18O isotopic species in natural abundance

The rotational spectra of all singly substituted ¹³C and ¹⁸O isotopic species of the ground vibrational state of 2,5-dihydrofuran have been measured in natural abundance with millimeter-wave free jet technique and the r_s and r₀ heavy atom geometries have been determined.