The present state of understanding of the dynamics of magnetic domain walls and magnetic bubbles is reviewed. The theory of domain wall motion for the linear and non-linear regions is outlined. Experimental techniques for straight walls and magnetic bubbles are discussed. An extensive comparison between theory and experiment is made. Topics included are peak and saturation velocities, mobility, inertial effects and overshoot, hard bubbles, wall states and state transformations in magnetic bubbles. Origins of wall damping are also discussed.

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The molecular-beam electric resonance method served to measure the radio-frequency spectra of NaCl and to determine the hyperfine constants and the dipole moments for the '/)=0, 1, 2, and 3 vibrational levels of Na 35 Cl, and for the '/)=0 and 1 vibrational levels of Na 37 Cl.

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It is necessary to use this form of the rate equations which involves the negative, rather than those which involve the positive exponentials [Eqs. (13) and (14) of Ref. 4J to avoid roundoff errors in the sums which would eliminate all significant figures. The averaged populations used in Eq. (0 are calculated by n=![n(±to) +exp( -=to) ·n(±to) J. (A6)In calculations for the intermediate-and high-pressure regions, the approximation can be used that nCO) =n8q THE JOURNAL OF CHEMICAL PHYSICS andn(±to) =n P , wherenPis the steady-state population with the pumping power on. This approximation speeds up the calculation greatly, as it eliminates the calculation of exp( -=-5=)t o and the solving of the homogeneous set of equations (AS). In the low-pressure region, the program calculates the complex relative amplitude both exactly and with this approximation. As the pressure is increased, the two results agree to within better than experimental error, and only the approximate calculation is carried out for subsequent higher pressures. This approximation has proved to be accurate down to 10 p..Copies of this program, on cards, together with instructions for its use and sample input data are available from the authors.The molecular-beam electric-resonance method has been used to observe the radio-frequency spectra of 39K79Br and 39~81Br ~n the J = 1 rotational state and the 11=0, 1, and 2 vibrational levels. Analysis of the spectra has given dipole moments and hyperfine interaction constants of these molecules.