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We have performed an extensive level-resolved experimental study of vibrotationally inelastic collisions in this system Li* (vtjt) + Ne -* Li* (u/ = vt + &»Jf -. / ' , • 4-Aj) + Ne, with 8 < j) < 76. At high j t , the rate of vibrational transfer is large, exceeding the purely rotationally inelastic rate, and extremely specific, populating only a few rotational levels per Ay. The most probable A/ obeys the rule Aj = -4Av. These effects are enhanced at low collision velocity and are quite insensitive to u, -and the target gas. Classical trajectory calculations reproduce these results.

We report the first observation of natural circular dichroism (CD) in the x-ray region. Measurements at the Nd L 3 edge in single crystals of Na 3 Nd͑digly͒ 3 ? 2NaBF 4 ? 6H 2 O show CD with a dissymmetry factor g ഠ 10 23 of the same order of magnitude as observed in the visible-uv region and ϳ100 times greater than in the vibrational infrared. Calculations using multiple scattering theory (MST) are in excellent agreement with the measured CD in the near-edge region (about 100 eV from the rising edge) and show that the effect arises from the electric dipole-electric quadrupole interference mechanism.[S0031-9007(98)06201-2]

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