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The probability and the amplitudes (2,)~-parameters) for exciting the magnetic sublevels of Mg+(3p) in collisions with Ar-atoms have been computed within the coupledchannel impact parameter approximation. An excitation mechanism is found which accounts for most of the pecularities observed in the energy and impact parameter dependence of the 2,z-parameters for this collision system: the a3sMg + orbital acquires 3d-character at internuclear distances <1.8 a.u. and by strong rotational coupling among the 3d-molecular orbitals in this region primarily the 3dn MO becomes populated. The final distribution among the magnetic sublevels of Mg+(3p) is determined by the rotational coupling at intermediate and large internuclear distances (>3 a.u.) between the cr3p and ~3p magnetic substates of Mg+(3p).

The design and operation of a new 5/10 kW CO2 laser with unstable resonator and integrated RF power stags will be described. The system3is characterized by a discharge power density of 25 W /cm for cw operation and 100 W /cm for superpulse operation. The gas is circulated by three axial flo/ blowers. The volume of the laser system including the power stage is 1.8 x 1.7 x 1.6 m . The output power can be controlled in the range between 10 and 100% using a 25 kHz pulse modulation and varying the duty cycle at constant power level. The beam quality and pointing stability was investigated using a beam analyser (LBA) at the expanded far -field, generated by means of a concave mirror with large radius of curvature (R = 20 m). Good beam quality and pointing stability has been demonstrated for this transverse flow laser with RF excitation. DESIGN

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