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Author : Tsogbayar Tsednee
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (13 download)
Download or read book Ionization of the Hydrogen Molecular Ion by Strong Infrared Laser Fields written by Tsogbayar Tsednee and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Timo Eduard Karl Wilbois
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (971 download)
Download or read book Single Ionization of Molecular Hydrogen in Strong Laser Fields written by Timo Eduard Karl Wilbois and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Zusammenfassung: The investigation of ionization dynamics of molecular hydrogen exposed to strong fields of ultra-short laser pulses has received continued attention in theory and experiment during the last two decades. Most experiments were addressed to the double ionization of H2 or dissociation of the molecular ion H2+. The investigation of the single ionization process of the neutral molecule however is restricted to very few experiments. In the present thesis single ionization of H2 with pulses of 100 fs duration at intensities in the range of 10^13 to 10^14 W/cm^2 and at wavelengths between 300 and 800 nm is investigated, thus in a domain where neither perturbation theory nor approximative strong-field theories are applicable. The single ionization of H2 is analyzed on basis of measured angular-resolved photoelectron spectra. Comparison with theoretical computations is performed for angular-resolved photoelectron spectra in a simplistic model calculation and for intensity dependent ionization rates with ab initio calculations. In addition to the measurement and analysis of photoelectron spectra, experimental techniques have been improved and a comparison of algorithms addressing the Abel-inversion of experimental imaging data was performed. In order to further investigate the ionization dynamics in H2 a novel spectrometer type was constructed to allow for multi-coincidence measurements of the ionization fragments
Author : Youliang Yu
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (14 download)
Download or read book Computationally Exploring Ultrafast Molecular Ionization written by Youliang Yu and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Strong-field ionization plays a central role in molecules interacting with an intense laser field since it is an essential step in high-order harmonic generation thus in attosecond pulse generation and serving as a probe for molecular dynamics through either the sensitivity of ionization to the internuclear separation or the laser-induced electron scattering. Strong-field molecular ionization has been studied both theoretically and experimentally, dominantly through the Born-Oppenheimer approximation and at equilibrium or small reaction distances. We have extended the theoretical studies of molecular ionization to a much broader extent. Specifically, due to the difficulty of treating ionization in Born-Oppenheimer representation especially for molecular dynamics involving strongly-correlated electron-nuclear motion, we have investigated an alternative time-independent--adiabatic hyperspherical--picture for a one-dimensional model of the hydrogen molecule. In the adiabatic hyperspherical representation, all the reaction channels--including ionization--for the hydrogen molecule have been identified in a single set of potential curves, showing the advantage of studying molecular dynamics involving multiple breakup channels coupled with each other. We have thus proposed a good candidate to study strongly-correlated molecular dynamics, such as autoionization and dissociative recombination. Moving to a time-dependent picture by numerically solving the time-dependent Schrödinger equation (TDSE), we have explored two extreme classes of strong-field ionization of hydrogen molecule ion: at large internuclear distances (R>30 a.u.) and for long-wavelength laser fields. Remarkably, we have found strong-field two-center effects in molecular ionization beyond the long-standing one-photon two-center interference as a manifestation of the double-slit interference. In particular, the total ionization probability at large internuclear distances shows strongly symmetry-dependent two-center dynamics in homonuclear diatomic molecules and two-center induced carrier-envelope phase effect in heteronuclear diatomic molecules. Such two-center effects are expected to generalize to other diatomic systems and could potentially be used to explain phenomena in multi-center strong-field physics. Moreover, we have theoretically confirmed, for the first time, the existence of low energy structure in molecular ionization in long-wavelength laser fields by solving the three-dimensional TDSE. Finally, we have performed a pump-probe study of the hydrogen molecular ion where a pump pulse first dissociates the molecule followed by a probe pulse which ionizes the dissociating wave packet, and surprisingly found a pronounced broad ionization peak at large R or large pump-probe delay (~150 fs). Numerically, we have developed and implemented new theoretical frameworks to more accurately and efficiently calculate quantum mechanical processes for small molecules--hydrogen molecule and its ion--which could readily be adapted to heavier diatomic systems.
Author : Dimitri Batani
Publisher : Springer Science & Business Media
ISBN 13 : 1461513510
Total Pages : 409 pages
Book Rating : 4.4/5 (615 download)
Download or read book Atoms, Solids, and Plasmas in Super-Intense Laser Fields written by Dimitri Batani and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 409 pages. Available in PDF, EPUB and Kindle. Book excerpt: The recent developement of high power lasers, delivering femtosecond pulses of 20 2 intensities up to 10 W/cm , has led to the discovery of new phenomena in laser interactions with matter. At these enormous laser intensities, atoms, and molecules are exposed to extreme conditions and new phenomena occur, such as the very rapid multi photon ionization of atomic systems, the emission by these systems of very high order harmonics of the exciting laser light, the Coulomb explosion of molecules, and the acceleration of electrons close to the velocity of light. These phenomena generate new behaviour of bulk matter in intense laser fields, with great potential for wide ranging applications which include the study of ultra-fast processes, the development of high-frequency lasers, and the investigation of the properties of plasmas and condensed matter under extreme conditions of temperature and pressure. In particular, the concept of the "fast ignitor" approach to inertial confinement fusion (ICF) has been proposed, which is based on the separation of the compression and the ignition phases in laser-driven ICF. The aim of this course on "Atom, Solids and Plasmas in Super-Intense Laser fields" was to bring together senior researchers and students in atomic and molecular physics, laser physics, condensed matter and plasma physics, in order to review recent developments in high-intensity laser-matter interactions. The course was held at the Ettore Majorana International Centre for Scientific Culture in Erice from July 8 to July 14,2000.
Author : Yunquan Liu
Publisher : World Scientific
ISBN 13 : 9814696404
Total Pages : 248 pages
Book Rating : 4.8/5 (146 download)
Download or read book Advances Of Atoms And Molecules In Strong Laser Fields written by Yunquan Liu and published by World Scientific. This book was released on 2015-09-29 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents the latest advancements and future perspectives of atomic, molecular and optical (AMO) physics and its vital role in modern sciences and technologies. The chapters are devoted to a wide range of quantum systems, with an emphasis on the understanding of ionization, high-harmonic generation, molecular orbital imaging and coherent control phenomena originating from light-matter interactions. The book overviews current research landscape and highlight major scientific trends in AMO physics interfacing with interdisciplinary sciences. It may be particularly interesting for young researchers working on establishing their scientific interests and goals.
Author : Alejandro De la Calle
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (117 download)
Download or read book Dissociative Ionisation of the Hydrogen Molecular Ion by Intense Laser Fields written by Alejandro De la Calle and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Roberto Marquardt
Publisher : Elsevier
ISBN 13 : 0128172355
Total Pages : 376 pages
Book Rating : 4.1/5 (281 download)
Download or read book Molecular Spectroscopy and Quantum Dynamics written by Roberto Marquardt and published by Elsevier. This book was released on 2020-09-18 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Molecular Spectroscopy and Quantum Dynamics, an exciting new work edited by Professors Martin Quack and Roberto Marquardt, contains comprehensive information on the current state-of-the-art experimental and theoretical methods and techniques used to unravel ultra-fast phenomena in atoms, molecules and condensed matter, along with future perspectives on the field. Contains new insights into the quantum dynamics and spectroscopy of electronic and nuclear motion Presents the most recent developments in the detection and interpretation of ultra-fast phenomena Includes a discussion of the importance of these phenomena for the understanding of chemical reaction dynamics and kinetics in relation to molecular spectra and structure
Author : Martin Quack
Publisher : John Wiley & Sons
ISBN 13 : 0470066539
Total Pages : 2236 pages
Book Rating : 4.4/5 (7 download)
Download or read book Handbook of High-resolution Spectroscopy written by Martin Quack and published by John Wiley & Sons. This book was released on 2011-09-26 with total page 2236 pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of High-Resolution Spectroscopy has been considerably extended and even redefined in some areas. Combining the knowledge of spectroscopy, laser technology, chemical computation, and experiments, Handbook of High-Resolution Spectroscopy provides a comprehensive survey of the whole field as it presents itself today, with emphasis on the recent developments. This essential handbook for advanced research students, graduate students, and researchers takes a systematic approach through the range of wavelengths and includes the latest advances in experiment and theory that will help and guide future applications. The first comprehensive survey in high-resolution molecular spectroscopy for over 15 years Brings together the knowledge of spectroscopy, laser technology, chemical computation and experiments Brings the reader up-to-date with the many advances that have been made in recent times Takes the reader through the range of wavelengths, covering all possible techniques such as Microwave Spectroscopy, Infrared Spectroscopy, Raman Spectroscopy, VIS, UV and VUV Combines theoretical, computational and experimental aspects Has numerous applications in a wide range of scientific domains Edited by two leaders in this field Provides an overview of rotational, vibration, electronic and photoelectron spectroscopy Volume 1 - Introduction: Fundamentals of Molecular Spectroscopy Volume 2 - High-Resolution Molecular Spectroscopy: Methods and Results Volume 3 - Special Methods & Applications
Author : Max Möller
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book Probing Strong-field Photoionization of Atoms and Diatomic Molecules with Short-wave Infrared Radiation written by Max Möller and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The investigation of the interaction between atoms and diatomic molecules with strong laser fields with peak intensities in the range between ?10?^12 and ?10?^16 W/cm^2 has revealed fascinating phenomena such as high energy above-threshold ionization (HATI), non-sequential ionization (NSDI), high-harmonic generation (HHG) and frustrated tunnel ionization (FTI). Although experimental and theoretical considerations have shown that using longer laser wavelength is interesting from several aspects, the majority of measurements has been performed at laser wavelengths below 1.0 μm. Here, a laser source of intense femtosecond laser pulses with short-wave infrared (SWIR) wavelength is put to operation and applied to investigate strong-field photoionization (SFI) of atoms and diatomic molecules using two different experimental techniques for momentum spectroscopy of laser-induced fragmentation processes. Momentum distributions from strong-field photoionization of Xenon with different pulse duration are measured using the velocity map imaging technique. Besides observation of the pulse duration dependence a low-energy feature is investigated in detail. The corresponding modeling shows that the observations can be traced to rescattering between the laser-driven photoelectron and the remaining ion. SFI of the hydrogen molecular ion, H_2^+ (H_2^+?H^++H^++e^-), is investigated using Ion Target Recoil Ion Momentum Spectroscopy (ITRIMS). Besides measuring intensity dependent vector momentum distributions it is shown that momentum conservation can be used to extract the correlated electron momentum from the measured data, although the electron is not detected. This enables the analysis of the correlated electron-nuclear momentum distribution. Together, with a one-dimensional two-level model, this sheds light on correlated electron-nuclear ionization dynamics during SFI of diatomic molecules by SWIR fields.
Author : Bradley S. Moser
Publisher :
ISBN 13 :
Total Pages : 294 pages
Book Rating : 4.:/5 (712 download)
Download or read book Controlled Excitation of the Hydrogen Molecular Ion Via Intense Laser Pulses written by Bradley S. Moser and published by . This book was released on 2010 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Lutz Fechner
Publisher : Springer
ISBN 13 : 3319320467
Total Pages : 158 pages
Book Rating : 4.3/5 (193 download)
Download or read book High-Resolution Experiments on Strong-Field Ionization of Atoms and Molecules written by Lutz Fechner and published by Springer. This book was released on 2016-04-26 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, the ionization of atoms and small molecules in strong laser fields is experimentally studied using a reaction microscope. The population of autoionizing doubly excited states in the laser fields is proven and a possible connection to the well-known dielectronic recombination processes is discussed. The fundamental process of tunnel ionization in strong laser fields is subject of investigation in a pump-probe experiment with ultrashort laser pulses. A coherent superposition of electronic states in singly charged argon ions is created within the first, and subsequently tunnel-ionized with the second pulse. This gives access to state-selective information about the tunneling process and allows to test common models. Moreover, the ionization of krypton and argon at different wavelengths is studied, from the multiphoton to the tunneling regime. The wavelength-dependent investigations are furthermore extended to molecular hydrogen. In addition to ionization, this system might undergo different dissociative processes. Channel-selective electron momentum distributions are presented and compared to each other.
Author : Paul Corkum
Publisher : Springer Science & Business Media
ISBN 13 : 3540959467
Total Pages : 1031 pages
Book Rating : 4.5/5 (49 download)
Download or read book Ultrafast Phenomena XVI written by Paul Corkum and published by Springer Science & Business Media. This book was released on 2010-03-23 with total page 1031 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultrafast Phenomena XVI presents the latest advances in ultrafast science, including both ultrafast optical technology and the study of ultrafast phenomena. It covers picosecond, femtosecond and attosecond processes relevant to applications in physics, chemistry, biology, and engineering. Ultrafast technology has a profound impact in a wide range of applications, amongst them biomedical imaging, chemical dynamics, frequency standards, material processing, and ultrahigh speed communications. This book summarizes the results presented at the 16th International Conference on Ultrafast Phenomena and provides an up-to-date view of this important and rapidly advancing field.
Author : Tamar Seideman
Publisher : Frontiers Media SA
ISBN 13 : 2889767558
Total Pages : 194 pages
Book Rating : 4.8/5 (897 download)
Download or read book Coherent Phenomena in Molecular Physics written by Tamar Seideman and published by Frontiers Media SA. This book was released on 2022-08-09 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 726 pages
Book Rating : 4.3/5 (91 download)
Download or read book Journal of Experimental and Theoretical Physics written by and published by . This book was released on 2001 with total page 726 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Bernard Piraux
Publisher : Springer Science & Business Media
ISBN 13 : 9780792368632
Total Pages : 444 pages
Book Rating : 4.3/5 (686 download)
Download or read book Super-Intense Laser-Atom Physics written by Bernard Piraux and published by Springer Science & Business Media. This book was released on 2001-03-31 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of atomic systems exposed to super-intense laser fields de fines an important area in atomic, molecular and optical physics. Although the concept of super-intense field has no absolute meaning, it is now usual to call an electromagnetic field super-intense when it exceeds the atomic binding field. In the case of the simplest atomic system, hydrogen in its 16 2 ground state, this occurs above an intensity of 3. 5 x 10 Wattfcm which is the atomic unit of intensity. Presently at the laboratory scale and in ex tremely short and tightly focussed laser pulses, the electric field strength 16 18 2 reaches peak values which are of the order of 10 - 10 Wattfcm in the infrared frequency regime, the prospect being that such peak intensities may be reached within a few years in a regime of much higher frequencies (XUV or even X). The interaction of such electromagnetic fields with an atomic system has a highly non-linear character which has led to the observation of to tally unexpected phenomena. There are three fundamental processes which have marked the beginning of an intensive research in the field of super intense laser-atom physics (SILAP). These processes which only involve one atomic electron are (i) the so-called above-threshold ionisation i. e.
Author : Yuichi Fujimura
Publisher : Frontiers Media SA
ISBN 13 : 2832522114
Total Pages : 161 pages
Book Rating : 4.8/5 (325 download)
Download or read book Electronic and nuclear quantum dynamics of molecules in intense laser fields written by Yuichi Fujimura and published by Frontiers Media SA. This book was released on 2023-04-28 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Zi Jian Long
Publisher :
ISBN 13 : 9780494437230
Total Pages : 74 pages
Book Rating : 4.4/5 (372 download)
Download or read book Intense Laser Field Ionization of Atom and Molecular Ion written by Zi Jian Long and published by . This book was released on 2008 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: In order to understand how does the intense laser interact with matter we first of all study the ionization process. In this highly nonlinear region the conventional perturbation theory will fail to predict the experimental results. Alternative theories have been proposed in the past few decades. The fundamental difficulty in these new approaches is when laser field becomes so intense such that it is comparable to the Coulomb field at where the ground state electron mainly concentrate, we have to treat the laser field and the Coulomb field on an equal footing. The analytical solution that can describe the propagation of electron in both the laser field and the Coulomb field has not been found; therefore, in these new theories the ionization process is either divided temporarily into laser period and Coulomb period or spatially into laser field domain and Coulomb field domain. The propagation of electron in the full Hamiltonian is avoided.
