Download or read book Ionization Ultra rapide Et Dynamique Rotationnelle Mol culaire en Champs Laser Intenses written by Junyang Ma and published by . This book was released on 2021 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: The investigation of ultrafast molecular dynamics is of great importance towards the understanding of a variety of natural phenomena in physical and chemical sciences. With the rapid development of femtosecond laser systems and precision detection technologies, it is possible now to visualize and steer the motion of molecules in matter as well as the ultrafast dynamics of electrons and nuclei in molecules on a microscopic timescale. When a molecule is exposed to a strong laser field, its electrons can be freed or excited, which often triggers a rapid dissociation of the system, in which the released electrons and nuclei exhibit a strong correlation, while the electronic motion on attosecond timescale is much faster than that of the nuclear ranging from femtosecond to picosecond timescale. One example is the absorbed photon energy shared between electrons and nuclei in a molecular dissociation process. In addition, a lot of physical processes such as electron tunneling ionization show a strong dependence on the spatial direction of the molecular axes with respect to the polarization of the laser field. Confining molecular axes to a specific direction is significant in unambiguously understanding and controlling the ultrafast response of the molecules to the laser fields. Impulsive alignment induced by ultrafast laser pulses with field-free revivals is considered as a powerful method to control the spatiotemporal distribution of the molecules. Field-free alignment is also recognized as an important tool for studying basic physical processes such as rotational dynamics of complex molecules and ultrafast collisional dissipation.By using advanced technologies based on intense femtosecond laser systems, multi-particle coincidence measurements of Cold target recoil ion momentum spectroscopy (COLTRIM), and high-sensitive time-resolved birefringence detections, this thesis reports a variety of studies revealing ultrafast dynamics observed in molecules exposed to strong laser fields, including dissociative Rydberg excitation, tunneling-site-sensitive ionization and dissociation, molecular alignment, rotational echo, and ultrafast collisional dissipation probed by rotational alignment echo.

Download or read book Diffusion in Materials DIMAT 2011 written by Igor Bezverkhyy and published by Trans Tech Publications Ltd. This book was released on 2012-04-12 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt: The International Conference on Diffusion in Materials (DIMAT) is the benchmark conference series for diffusion in solids. DIMAT 2011 was organized by the University of Bourgogne in association with CNRS, Dijon (France). The conference showcased new results concerning theoretical tools as well as applied research approaches. Diffusion processes affect all types of materials: nanomaterials, materials for energy, metallurgy, glasses and ceramics, but each requires its own numerical tools. Volume is indexed by Thomson Reuters CPCI-S (WoS). This volume comprises most of the contributions presented at DIMAT 2011: 4 plenary lectures delivered by famous high-level scientists plus 88 contributions in the form of keynote lectures, talks and posters.

Download or read book Soil Constitutive Models written by Jerry A. Yamamuro and published by Amer Society of Civil Engineers. This book was released on 2005-01 with total page 497 pages. Available in PDF, EPUB and Kindle. Book excerpt: GSP 128 contains papers by 19 prominent constitutive modelers presented at the Geo-Frontier Conference, held in Austin, Texas, January 24-26, 2005.