Abstract

The microwave centrifugal distortion moment spectrum of the symmetric top 16O 31P 19P 3 in its ground vibronic state has been studied between 9 and 18 GHz with a Stark modulated spectrometer of high sensitivity. The frequencies of 152 transitions obeying the selection rules ΔJ = 0, ΔK = ±3 have been measured. A unique identification of the lines has been made by using the current results in a reanalysis of the allowed R-branch spectrum reported recently. From the Q-branch data, values were obtained for the rotational constant difference ( A 0 - B 0), two quartic distortion constants and three sextic distortion constants. In kHz, these are: ( A 0 - B 0) = 217,495 ± 2; D JK = (1.2971 ± 0.0007); D K = −(1.114 ± 0.012); H JK = (9.10 ± 0.27) × 10 −6; H KJ = −(6.8 ± 0.8) × 10 −6; H K = −(73 ± 30) × 10 −6. The value of ( A 0 - B 0) has been combined with the R-branch values of B 0 for 16OPF 3 and 18OPF 3 to give improved structural parameters. By comparing the intensities of two phosphoryl fluoride lines with the intensities of two silane lines of matching frequencies, the distortion dipole moment of 16OPF 3 has been determined to be (4.0 ± 1.4) × 10 −6 D.

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