Author: Hamzeh Moh'd Abdel-HalimPublisher:
ISBN:
Category : Carbon monoxide lasers
Languages : en
Pages : 328
Book Description
Vibrational Energy Transfer in Liquids
Author: Hamzeh Moh'd Abdel-HalimPublisher:
ISBN:
Category : Carbon monoxide lasers
Languages : en
Pages : 328
Book Description
Vibrational energy transfer studies in gas, liquid and supercritical rare gases
Author: Antonis MoustakasEnergy Transfer and Vibrationally Mediated Photodissociation in Liquids
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Vibrational energy is a central aspect of chemical reactivity. Because a few vibrationally energized molecules are the ones that actually overcome the barriers to reaction to form products, the means by which molecules acquire and lose energy is at the heart of chemistry. Thus, vibrationally excited molecules are important in an enormous variety of environments, ranging from the conventional, such as solutions, to the exotic, such as plasmas. The authors have extended their previous studies of the energy transfer and photodissociation dynamics of isolated molecules into the more complex environment of liquids with the goal of understanding the role that solvents play in the behavior of vibrationally excited molecules. In these experiments, a 100-fs pulse of near or mid-infrared light excites a high frequency stretching vibration of a solute molecule and another short pulse of ultraviolet light monitors the energy content of a subset of the vibrations by transient absorption. The measurements have revealed the influence that vibrational state structure and solvent interactions have on the flow of energy within the vibrationally excited molecule and into the surrounding solvent. (4 figures, 28 refs.).
The Effect of the Liquid Environment on Vibrational Energy Flow in Small Molecules
Author: Donald Way LupoPublisher:
ISBN:
Category : Carbon monoxide
Languages : en
Pages : 324
Book Description
Intramolecular Vibrational Energy Transfer and Bond-Selected Photochemistry in Liquids
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 9
Book Description
The research described in this Final Report was directed toward measuring the time for energy flow within isolated molecules and in molecules in solution. The approach was to use a 100-fs pulse of light from a Ti:sapphire laser to pump two optical parametric amplifiers in order to generate infrared pulses, for exciting vibrations, and ultraviolet light, for exciting electronic transitons. In the gas phase experiments, one pulse excited the first overtone of the O-H stretching vibration in nitric acid and the second pulse probed the excited molecule by excitation to a dissociative electronic surface, which led to the production of electronically excited products that emitted light. The experiment showed that the flow of energy out of the O-H stretch takes about 12 ps. In the liquid experiments, the infrared pulse excited the first overtone of the C-H stretch in methylene iodide and the ultraviolet pulse probed the molecule by transient absorption. The flow of energy within the molecule took about l0 ps, and the flow of energy into the solvent took between 70 ps (in carbon tetrachloride) and 30 ps (in benzene) depending on the solvent.
Vibrational Energy Transfer in Gas Phase Water and Ammonia
Author: Floyd Eugene HovisDynamics of Molecular Collisions
Author: W. MillerPublisher: Springer Science & Business Media
ISBN: 1475706448
Category : Science
Languages : en
Pages : 391
Book Description
Activity in any theoretical area is usually stimulated by new experimental techniques and the resulting opportunity of measuring phenomena that were previously inaccessible. Such has been the case in the area under consideration he re beginning about fifteen years aga when the possibility of studying chemical reactions in crossed molecular beams captured the imagination of physical chemists, for one could imagine investigating chemical kinetics at the same level of molecular detail that had previously been possible only in spectroscopic investigations of molecular stucture. This created an interest among chemists in scattering theory, the molecular level description of a bimolecular collision process. Many other new and also powerful experimental techniques have evolved to supplement the molecular be am method, and the resulting wealth of new information about chemical dynamics has generated the present intense activity in molecular collision theory. During the early years when chemists were first becoming acquainted with scattering theory, it was mainly a matter of reading the physics literature because scattering experiments have long been the staple of that field. It was natural to apply the approximations and models that had been developed for nuclear and elementary particle physics, and although some of them were useful in describing molecular collision phenomena, many were not.
Study of Vibrational Energy Transfer at a Liquid Tin Surface
Author: W. B. NilssonPublisher:
ISBN:
Category :
Languages : en
Pages : 21
Book Description
Single collision vibrational energy transfer for a canonical ensemble (T=300K) of cyclobutene molecules at a liquid tin surface was studied at temperatures from 500K to 775K. Transport above the reaction threshold for isomerization to butadiene was used as the criterion for efficiency of vibrational energy accommodation. The surface was found to function as a strong collider below 550 K. Experiments both above and below the freezing point revealed no discontinuity in the vibrational accommodation efficiency.
Ultrafast Infrared Vibrational Spectroscopy
Author: Michael D. FayerPublisher: CRC Press
ISBN: 1466510137
Category : Science
Languages : en
Pages : 491
Book Description
The advent of laser-based sources of ultrafast infrared pulses has extended the study of very fast molecular dynamics to the observation of processes manifested through their effects on the vibrations of molecules. In addition, non-linear infrared spectroscopic techniques make it possible to examine intra- and intermolecular interactions and how such interactions evolve on very fast time scales, but also in some instances on very slow time scales. Ultrafast Infrared Vibrational Spectroscopy is an advanced overview of the field of ultrafast infrared vibrational spectroscopy based on the scientific research of the leading figures in the field. The book discusses experimental and theoretical topics reflecting the latest accomplishments and understanding of ultrafast infrared vibrational spectroscopy. Each chapter provides background, details of methods, and explication of a topic of current research interest. Experimental and theoretical studies cover topics as diverse as the dynamics of water and the dynamics and structure of biological molecules. Methods covered include vibrational echo chemical exchange spectroscopy, IR-Raman spectroscopy, time resolved sum frequency generation, and 2D IR spectroscopy. Edited by a recognized leader in the field and with contributions from top researchers, including experimentalists and theoreticians, this book presents the latest research methods and results. It will serve as an excellent resource for those new to the field, experts in the field, and individuals who want to gain an understanding of particular methods and research topics.
Author: Reiner Wertheimer