Microwave spectra of 1,3hyphen;difluoroallene and fluoroallene

摘要

The microwave spectra of 1,3minus;difluoroallene and fluoroallene have been recorded from 12.4 to 40.0 GHz. For the 1,3minus;difluoroallene molecule, bothRminus;branch andQminus;branch assignments have been made for the ground vibrational state for thebminus;type transitions. The rotational constants were found to be:A= 25101.15plusmn;0.12,B= 2170.02plusmn;0.07, andC= 2117.40plusmn;0.04 MHz. The value of the dipole moment was obtained from Stark splittings to be 1.77plusmn;0.01 D. For the fluoroallene molecule, onlyRminus;branchaminus;type transitions were assigned from which theBandCrotational constants were determined to be 4300.11plusmn;0.05 and 4039.34plusmn;0.05 MHz, respectively. The dipole moment components for fluoroallene were found to be: mgr;a= 1.44, mgr;b= 1.34, and mgr;t= 1.97 D from the Stark splittings. The dipole moments are compared to those of similar molecules.