HIGH-RESOLUTION FTIR AND MILLIMETER-WAVE STUDY OF FCLO3 - GROUND-STATE ROTATIONAL-CONSTANTS INCLUDING A0, STRUCTURE, AND THE NU-2, NU-3, NU-5, AND NU-6 EXCITED-STATES

The millimeter-wave spectrum of natural FClO3 has been recorded in the 350-400 GHz range, and transitions with 33 ≦ J ≦ 37 and 0 ≦ K ≦ 30 have been measured. The infrared spectrum of monoisotopic F35ClO3 has been investigated in the 350-800 cm-1 region with a resolution of 3-4 × 10-3 cm-1, and the fundamentals ν2, ν3, ν5, and ν6 were rotationally resolved. The ground state constants B0, DJ0, and DJK0 were obtained by combining microwave and millimeter-wave data and ground state combination differences determined from the ν2 and ν5 infrared bands. The axial rotational constant A0 of F35ClO3 has been accurately determined from ΔK = ±3 resonance effects detected in the ν5 band. Equilibrium rotational constants of F35ClO3 were deduced with the help of vibrational corrections αiA,B, i = 1-6, and the rs, r0, and re structure of FClO3 determined. © 1991.