15min:
DEUTERIUM QUADRUPOLE COUPLING IN PROPIOLIC ACID AND FLUOROBENZENES MEASURED WITH FTMW SPECTROMETER USING MULTIPLE FIDS .

MING SUN, BRYAN M. SARGUS, SPENCER J. CAREY AND STEPHEN G. KUKOLICH, Department of Chemistry and Biochemistry, The University of Arizona, Tucson, Arizona 85721..

Rotational spectra of deuterated propiolic acids (Pro-OD and Pro-CD), 1-fluorobezence (4-D), and 1,2-difluorobezence (4-D) in their ground states have been measured using the newly constructed Fourier transform microwave (FTMW) spectrometer with 12" dia. mirrors and 5 kHz resolution. Multiple Free Induction Decays (FIDs) [up to 15] as well as background subtraction can be achieved with each beam pulse. For 1-fluorobezence (4-D), three hyperfine lines from the lowest J=1-0 transition were measured to check the synthesis method. For 1,2-difluorobezence (4-D), we obtained 35 hyperfine transitions from 3 to 12 GHz, including four different DeltaJ transitions. Deuterium quadrupole coupling along three the inertia axes was well resolved. For deuterated propiolic acids, 37 hyperfine lines of Pro-OD and 59 hyperfine lines of Pro-CD, both including four different DeltaJ transitions, were obtained from 5 to 16 GHz. Deuterium quadrupole coupling along three the inertia axes was well resolved for Pro-OD. For Pro-CD, only the eQqaa was determined due to the near-coincidence of the CD bond and the a inertial axis.