[en] Radiative corrections using third-order perturbation theory are considered in a theoretical calculation of the Zeeman effect. The corrections have been calculated for the states 2³P of helium, and found to be of the same order as other radiative corrections calculated by Anthony and Sebastian [Phys. Rev. A 48, 3792 (1993)]. copyright 1997 The American Physical Society

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[en] The two-photon ionization cross section for the neutral argon atom is calculated. A double perturbation expansion in the Coulomb correlations and the atom--radiation-field interaction is made. Contributions from intermediate states are obtained by direct summation over Hartree-Fock bound and continuum single-particle states. The effects of electron correlations and photon-radiative corrections are investigated. Comparison is made with previous theoretical methods

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[en] Unfortunately, the Acknowledgment section was missing in the original article. It is given below.

[en] We use the supersymmetric formalism to derive an integral formula for the density of states of the Gaussian Orthogonal Ensemble, and then apply saddle-point analysis to give a new derivation of the 1/N-correction to Wigner's law. This extends the work of Disertori on the Gaussian Unitary Ensemble. We also apply our method to the interpolating ensembles of Mehta–Pandey

[en] In this note are described the global DC closed orbit correction experiments conducted on the X-ray ring at National Synchrotron Light Source (NSLS). The beam response matrix, defined as beam motion at BPM locations per unit kick by corrector magnets, was measured and then inverted using the technique of singular value decomposition (SVD). The product of the inverted matrix and the difference orbit gives the incremental kick strengths necessary to correct the orbit. As a result, the r.m.s. orbit error around the ring was reduced from 208 μm to 61 μm

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