We investigate the possibility to measure the nonforward gluon distribution function by means of diiractively produced + ? and K + K ? pairs in polarized lepton nucleon scattering. The resulting cross sections are sizable and are dominated by the gluonic contribution. We nd large spin asymmetries, both for + ? and for K + K ? pairs.

The alkali fulleride Rb4C60 has been investigated by studies of the resistance and by Raman spectroscopy under pressures up to 2 GPa and 13 GPa, respectively. Our data show a reversible phase separation into metallic Rb3C60 and Rb6C60 at pressures above 1 GPa. The reversibility indicates that the phase separation primarily occurs on the nanometer length scale. The data explain several puzzling ...

We review the compelling case for establishing a capability to accelerate positrons at Jefferson Lab. The potential appplications range from the study of two-photon exchange and deeplyvirtual Compton scattering to exploiting the charge current weak interaction to probe the flavor structure of hadrons and nuclei. There are also fascinating ideas for using such a capability to discover new physic...

Department of Chemistry, University of California, Irvine, Irvine, California 92697, United States Department of Materials Science and Engineering, Institute for Advanced Materials Devices and Nanotechnology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States Department of Physics, University of California, Irvine, Irvine, California 92697, United States De...

We develop a rigorous electromagnetic theory of diffraction of light by a grating impressed on a nonlinear material. The theory can be used to study Surface. Enhanced Raman Scattering or Second Harmonic Generation.

The stimulated Raman scattering signal is often accompanied by unwanted background arising from other pump-probe modalities. We demonstrate an approach to overcome this challenge based on spectral domain modulation, enabled by a compact, cost-effective angle-to-wavelength pulse shaper. The pulse shaper switches between two spectrally narrow windows, which are cut out of a broadband femtosecond ...

Photo-excitation and size-dependent Raman scattering studies on the silicon (Si) nanostructures (NSs) prepared by laser-induced etching are presented here. Asymmetric and red-shifted Raman line-shapes are observed due to photo-excited Fano interaction in the quantum confined nanoparticles. The Fano interaction is observed between photo-excited electronic transitions and discrete phonons in Si N...

B. Chen, D. V. S. Muthu, Z. X. Liu, A. W. Sleight, and M. B. Kruger Department of Physics, University of Missouri, Kansas City, Missouri 64110 Department of Physics, Indian Institute of Science, Bangalore 560 012, India Geophysical Laboratory and Center for High Pressure Research, Carnegie Institution of Washington, Washington, D.C. 20015 Department of Chemistry, Oregon State University, Corval...