# ANTICROSSING RESONANCES IN THE FIR LMR SPECTRUM OF $FO_{2}$: A CLASSIC EXAMPLE

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 Title: ANTICROSSING RESONANCES IN THE FIR LMR SPECTRUM OF $FO_{2}$: A CLASSIC EXAMPLE Creators: Davies, P. B.; Sears, Trevor J.; Temps, F. Issue Date: 1990 Publisher: Ohio State University Abstract: We have detected strong laser magnetic resonance (LMR) spectra of the $FO_{2}$ radical on two closely spaced laser lines around $919 \mu m$. The spectra show two distinct types of pattern, one has an extended progression of narrow resonances while the other exhibits an extremely strong, broad, doublet with an unsymmetrical lineshape. We have assigned these spectra following predictions of nearby zero field transitions using our earlier mm-wave $results^{1}$. The patterns arise from a very complicated set of anticrossings involving seven different rotational levels and give information on the off diagonal elements of the spin-rotation and spin g-factor tensors. Although the observed spectra are complicated, it is likely that similar mechanisms will dominate the FIR LMR spectra of all heavier asymmetric top radicals Description: $^{1}$ M. Bogey, P. B. Davics, C. Demuynck, J. L. Destombes and T. J. Sears, Molec. Phys. 67 1033 (1989). Work at Brookhaven National Laboratory was carried out under contract DE-ACO2-76CH00016 with the U.S. Department of Energy and supported by its Division of Chemical Sciences, Office of Basic Energy Sciences. Author Institution: Department of Chemistry, University of Cambridge; Department of Chemistry, Brookhaven National Laboratory; Department of Chemistry, MPI f\""{u}r Stroemungsforschung URI: http://hdl.handle.net/1811/18346 Other Identifiers: 1990-TH-7