TY - GEN A1 - Pena, J. A. A1 - Graeff, Christian A1 - Krebs, Andreas A1 - Glüer, Claus-C. T1 - Cross-calibration of different reconstruction kernels for vertebral trabecular microstructure measures on a clinical CT under in-vivo like settings Y1 - 2009 ER - TY - CHAP A1 - Turu, Valenti A1 - Hirsch, Florian A1 - Pena-Monne, J. L. A1 - Raab, Thomas A1 - Ros, X. A1 - Marti-Bono, Carlos A1 - Constante-Orrios, A. ED - Turu, Valenti ED - Constante, Ana T1 - Prospeccion geofisica y geomecanica de la ribera de Biescas (pirineos centrales): estructura del relleno sedimentario del fondo del valle y los sedimentos de vertiente T2 - Resums XIII Reunio Nacional de Quaternari, AEQUA, Andorra 2011 Y1 - 2011 SN - 978-99920-1-861-3 SN - 978-99920-1-860-6 SP - 81 EP - 83 PB - Imp. Envalira [u.a.] CY - Andorra la Vella ER - TY - GEN A1 - Ornelas-Skarin, Chance A1 - Bezriadina, Tatiana A1 - Fuchs, Matthias A1 - Ghimire, Shambhu A1 - Hastings, J. B. A1 - Nguyen, Quynh L. A1 - de la Peña, Gilberto A1 - Sato, Takahiro A1 - Shwartz, Sharon A1 - Trigo, Mariano A1 - Zhu, Diling A1 - Popova-Gorelova, Daria A1 - Reis, David A. T1 - Second-order microscopic nonlinear optical susceptibility in a centrosymmetric material : application to imaging valence electron motion T2 - Physical review X N2 - We report measurements of phase-matched nonlinear x-ray and optical mixing from single-crystal silicon using subresonant 0.95 eV laser pulses and 9.5 keV hard x-ray pulses from the Linear Coherent Light Source free-electron laser. The mixing signal appears as energy and momentum sidebands to the elastic Bragg peak. It is proportional to the magnitude squared of the relevant temporal and spatial Fourier components of the optically induced microscopic charges and currents. We measure the first- and second-order sideband to the 220 Bragg peak and find that the efficiency is maximized when the applied field is along the reciprocal lattice vector. For an optical intensity of approximately 1012  W/cm2, we measure peak efficiencies of 3 ×10−7 and 3 ×10−10 for the first- and second-order sideband, respectively (relative to the elastic Bragg peak). The first-order sideband is consistent with induced microscopic currents along the applied electric field and an isotropic response. The second-order sideband depends nontrivially on the optical field orientation and is consistent with an anisotropic response originating from induced charges along the bonds with C3⁢𝑣site symmetry. The results agree well with first-principles Floquet-Bloch calculations.tions. KW - Charge density waves KW - Charge dynamics KW - Chemical bonding KW - Crystal phenomena KW - Crystal structure KW - Nonlinear optics KW - Dielectric properties KW - Nonlinear optical susceptibility KW - Ultrafast optics KW - Ultrafast phenomena KW - X-ray beams & optics KW - Polarizability Dynamical diffraction KW - X-ray diffraction KW - X-ray scattering KW - X-ray techniques Y1 - 2026 U6 - https://doi.org/10.1103/7vqw-jbs7 SN - 2160-3308 VL - 16 SP - 011006-1 EP - 011006-13 PB - APS CY - College Park, Maryland ER -