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An experimental method is presented for a reasonably precise, direct measurement of the velocity of light using simple apparatus. The method is based on the result that the Fourier transform of a pair of identical pulses yields a frequency spectrum with zeros which are simply related to the time separation of the pulses. The principal pieces of apparatus required for the experiment are a photomultiplier and high-voltage power supply, and a short-wave radio receiver. With this relatively simple equipment and path lengths of fifty to one hundred feet, c may be readily measured to an accuracy of 1% or better.

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Solutions of the Hartree-Fock equations for the 'P and 'P terms of neon (2p'3s) have been obtained.Wave functions are tabulated and results of computations of excitation energies and oscillator strengths are presented. The former fall within 1O% of experimental values. Tt is found that enlarging the size of the "invariant core" used to compute the excited state wave functions has only a small e6ect on the predicted energies. The predicted oscillator strength of the 736 A transition is 0.11, which is in reasonable agreement with available experimental data considering the large uncertainties in the measurements. The computed di™gneticsusceptibility of the ground state is -7.4X10 cm ' mole, in good agreement with experiment.