The excitation function for Li + HF → LiF + H at collision energies below 80 meV.

We have measured the dependence of the relative integral cross section of the reaction Li + HF → LiF + H on the collision energy (excitation function) using crossed molecular beams. By varying the intersection angle of the beams from 37° to 90° we covered the energy range 25 meV ≤ E(tr) ≤ 131 meV. We observe a monotonous rise of the excitation function with decreasing energy over the entire energy range indicating that a possible translational energy threshold to the reaction is significantly smaller than 25 meV.

Kinematic slowing and electrostatic guiding of KBr molecules formed by the reactive collision process: K + HBr --> KBr + H.

We have generated a beam of translationally cold KBr molecules formed by exoergic reactive collisions in counterpropagating beams of K atoms and HBr molecules. The method relies on the extreme mass ratio of the products and the proper choice of the beam velocities (Liu, N.-N.

Kinematic slowing of molecules formed by reactive collisions.

We report the generation of a beam of slow (translationally cold) KBr molecules formed by exoergic reactive collisions in counterpropagating beams of K atoms and HBr molecules. The intensity of the slow beam is estimated to 4x10(11) s-1 sr-1. The velocity distribution (density) peaks at 42.

Outcomes of vaginal reconstructive surgery with and without graft material.

Objective: This study was undertaken to evaluate the outcomes of vaginal surgery for pelvic organ prolapse, comparing cases implementing graft augmentation to those without graft augmentation.

Study Design: This was a retrospective cohort study of 312 patients who underwent vaginal surgery for prolapse from February 1998 to January 2004.

Results: Of the 312 patients, 98 (31.

Effect of rotational energy on the reaction Li + HF(upsilon = 0,j)-->LiF + H: an experimental and computational study.

In a crossed molecular-beam study we have measured angular and time-of-flight distributions of the product LiF from the reaction Li + HF(upsilon = 0)-->LiF + H at various collision energies ranging from 97 to 363 meV for three markedly different rotational state distributions of HF obtained at nozzle temperatures close to 315, 510, and 850 K. Particularly, for the low and intermediate collision energies we observe significant effects of the varying j-state populations on the shape of the product angular distributions. At 315 K an additional feature appears in the angular distributions which is interpreted as being due to scattering from HF dimers.

Levator contraction strength and genital hiatus as risk factors for recurrent pelvic organ prolapse.

Objective: To correlate levator ani contraction strength and genital hiatus measurements with surgical failure in prolapse.

Study Design: This retrospective study involved chart review for documentation of levator contraction strength, genital hiatus measurement, and recurrent pelvic floor disorders in women who underwent surgery for prolapse.

Results: The recurrent prolapse rate was 34.

Molecules on kepler orbits: An experimental study.

We have demonstrated experimentally that polar molecules revolve around the inner electrode of a charged cylindrical capacitor in helical trajectories that result from a superposition of a translational motion along and an orbital motion around the cylinder axis. In this way molecular beams can be guided over any given distance. The results have been obtained for nozzle beams of NaCl, NaBr, and NaI seeded in Kr.

Orientation and alignment in reactive beam collisions: recent progress.

The concept of directional axis distributions and orientation-dependent reaction cross sections is used to describe the effect of the mutual orientation of reagents on the outcome of reactive beam collisions. The axis distributions and cross sections are expanded in series of Legendre polynomials and real spherical harmonics, respectively, and characterized by the expansion coefficients (moments). The interrelations between the moments of the cross sections and the directionally dependent experimental data (steric effects) on the one hand and the anisotropic properties of the potential energy surfaces on the other hand are presented.