Articles you may be interested inCluster cross sections from pickup measurements: Are the established methods consistent? J. Chem. Phys. 135, 104305 (2011); 10.1063/1.3633474 Cross sections for rotational decoherence of perturbed nitrogen measured via decay of laser-induced alignment J. Chem. Phys. 133, 044311 (2010); 10.1063/1.3464487Scattering dynamics in HF+He, Ne, and Ar: State-to-state cross sections, Dopplerimetry, and alignment measurement via direct infrared laser absorption in crossed supersonic jets Cross sections for the excitation of the upper laser levels 4p2D6/2 , 2Da/2, 2Pa/2, and 2SI/2 of Ar(lI) by electron impact with ground-state neutral atoms have been found by measuring the incoherent light produced by a triode-type structure filled with argon to pressures near 0.1 torr. Peak values in the vicinity of 5 X 10-19 cm 2 are found. By operating the same structure in an argon-ion laser cavity, an increase in coherent output is measured. The amount of the increase in output may be used in conjunction with the measured upperstate cross section to estimate the cross section for electron excitation of the lower laser levels. 4 R. M. St. John, F. L. Miller, and C. C. Lin, Phys. Rev. 134, A888 (1964).

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Intense Iaser (>lO" W/cm') sources using pulse compression techniques in the sub-picosecond time frame have been used to create dynamic electric field strenghs in excess of 100 Megavolts/micron with associated ma,onetic field strengths in the Gigagauss re,oime. We have begun a series of experiments using the Petawatr Laser system at LLNL to determine the potential of these sources for a variety of applications. Hot electron spectra from laser-tar_pet interactions in Au have been measured with energies up to 100 MeV. Hot x-ray production has been measured using filtered thermoluminescent dosimeters and threshold nuclear activation (y,n) from giant resonance interactions. High resolution radiographs through a pr 2 165 gmkm' have been obtained. Dose levels in the x-ray band Gom 2-8 MeV have been measured at the level of several Rads at one meter from the target for a single pulse. The physics of these sources and the scaling relationships and laser technology required to provide high magnetic fields will be discussed. Results of preliminary magnetic field calculations will be presented along with potential applications of this technology and estimates of the fundamental scaling limits for future development.

The effect of a superimposed mean strain on the fatigue behavior of the aluminum alloy AIMg5Mn 2 Werkstoff und experimentelle Vorgehensweise Die Legierung AlMgSMn (Zusammensetzung nach [ 2 ] : 4,7-5,5 Gew.% Mg, 0,5-1,0 Gew.% Mn, geringe Gehalte an Fe, Si, Zn, Ti und Cu) wurde in den in Tabelle I aufgefuhrten drei Festigkeitszustanden hinsichtlich ihres Wechselverformungsverhaltens untersucht. Mat.-wiss. u. Werkstofftech. 28, 347-363 ( 1 997) 0 VCH Verlagsgesellschaft mbH, D-6945 1 Weinheim, 1997 0933-5 137/97/0707-0347$17.50 + .50/0 347

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