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The nine-line magnetic resonance spectrum of N"0" is observed at 6elds in the range of 8600 oersted at a frequency of 9360 megacycle/sec. The spectrum arises from magnetic-dipole transitions between Zeeman levels in the J=-, state of the 'II3~~spin component. The line positions allow a determination of the magnetic IJ coupling constant, which is 29.8~0.3 megacycle /sec. , and the nuclear electric quadrupole coupling, which is -1.7~0.5 megacycle /sec, The line position and triplet spacings, which arise from molecular perturbations, are in good agreement with the theory of Margenau and Henry. The absolute intensity of the three stronger lines is measured to be g"=1.2X10 ' which also agrees with theory.

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IONIZATION BY 5-MEV a PARTICLES IN A 645 of the argon atoms with methane molecules would be approximately 10 8 per second per excited argon atom. The assumption that the cross section measured by Biondi for the destruction of metastable helium by argon applies to the argon-methane reaction leads to approximately 5X10 6 destructions (hence ionizations) per second per excited argon. Therefore an excited state * Assisted by the Office of Naval Research and the du Pont Company. t du Pont Company Fellow in Physics.The magnetic resonance spectrum of the 4 5 ground state of atomic nitrogen-14 has been observed using the microwave absorption method. The magnetic-dipole hyperfine interaction constant is ^ = 10.45±0.02Mc/sec.No evidence was obtained for electric quadrupole interaction.