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Doppler-limited tunable diode laser spectra of v. of 28SiF. have been analyzed and the spectroscopic constants determined. In contrast to most earlier low-resolution studies, the Coriolis constant t •. when combined with t 3 as obtained from previous laser spectroscopy. yields a zeta sum that is within 5% of the expected harmonic value of 1/2. The band origins of 12 overtones and combinations have been obtained from Fourier-transform spectra (0.04 cm-1 resolution). resulting in estimates of the anharmonicity constants and harmonic frequencies. From the Coriolis constants and the isotope shifts in v 3 we have redetermined the general quadratic force field of SiF 4 ,

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