Author: Benjamin Jefferys GreenblattPublisher:
ISBN:
Category :
Languages : en
Pages : 484
Book Description
Femtosecond Photoelectron Spectroscopy
Author: Benjamin Jefferys GreenblattPublisher:
ISBN:
Category :
Languages : en
Pages : 484
Book Description
Femtosecond Photoelectron Spectroscopy for Observation of Chemical Reactions
Author: Oksana GraefeFemtosecond Photoelectron Spectroscopy: a New Tool for the Study of Anion Dynamics
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
A new experimental technique for the time-resolved study of anion reactions is presented. Using femtosecond laser pulses, which provide extremely fast ([approx] 100 fs) time resolution, in conjunction with photoelectron spectroscopy, which reveals differences between anion and neutral potential energy surfaces, a complex anion reaction can be followed from its inception through the formation of asymptotic products. Experimental data can be modeled quantitatively using established theoretical approaches, allowing for the refinement of potential energy surfaces as well as dynamical models. After a brief overview, a detailed account of the construction of the experimental apparatus is presented. Documentation of the data acquisition program is contained in the Appendix. The first experimental demonstration of the technique is then presented for I[sub 2][sup -] photodissociation, modeled using a simulation program which is also detailed in the Appendix. The investigation of I[sub 2][sup -] photodissociation in several size-selected I[sub 2][sup -](Ar)[sub n] (n= 6-20) and I[sub 2][sup -](CO[sub 2])[sub n] (n= 4-16) clusters forms the heart of the dissertation. In a series of chapters, the numerous effects of solvation on this fundamental bond-breaking reaction are explored, the most notable of which is the recombination of I[sub 2][sup -] on the ground[tilde X]([sup 2][Sigma][sub u][sup+]) state in sufficiently large clusters. Recombination and trapping of I[sub 2][sup -] on the excited[tilde A]([sup 2][Pi][sub 3/2,g]) state is also observed in both types of clusters. The studies have revealed electronic state transitions, the first step in recombination, on a[approx]500 fs to[approx]10 ps timescale. Accompanying the changes in electronic state is solvent reorganization, which occurs on a similar timescale. Over longer periods ([approx]1 ps to & gt;200 ps), energy is transferred from vibrationally excite d I[sub 2][sup -] to modes of the solvent, which in turn leads to solvent evaporation. These effects become more important as cluster size increases. In addition, differences in timescale and mechanism are observed between clusters of Ar, which binds to I[sup -] and I[sub 2][sup -] rather weakly, and CO[sub 2], whose large quadruple moment allows substantially stronger binding to these anions.
Femtosecond time resolved photoelectron spectroscopy in the extreme ultraviolet region
Author: Peter ŠiffalovičFemtosecond Time-resolved Photoelectron Spectroscopy of Phenol
Author: Carolyn Patricia SchickPublisher:
ISBN:
Category :
Languages : en
Pages : 300
Book Description
Towards Femtosecond Time Resolved Electron Spectroscopy for Chemical Analysis
Author: Annette PietzschPublisher:
ISBN: 9783899637991
Category :
Languages : en
Pages : 89
Book Description
Femtosecond Photoelectron Spectroscopy
Author: Benjamin Jefferys GreenblattPublisher:
ISBN:
Category :
Languages : en
Pages : 554
Book Description
Femtochemistry and Femtobiology
Author: Abderrazzak DouhalPublisher: World Scientific
ISBN: 9810248660
Category : Science
Languages : en
Pages : 854
Book Description
This book contains important contributions from top international scientists on the-state-of-the-art of femtochemistry and femtobiology at the beginning of the new millennium. It consists of reviews and papers on ultrafast dynamics in molecular science.The coverage of topics highlights several important features of molecular science from the viewpoint of structure (space domain) and dynamics (time domain). First of all, the book presents the latest developments, such as experimental techniques for understanding ultrafast processes in gas, condensed and complex systems, including biological molecules, surfaces and nanostructures. At the same time it stresses the different ways to control the rates and pathways of reactive events in chemistry and biology. Particular emphasis is given to biological processes as an area where femtodynamics is becoming very useful for resolving the structural dynamics from techniques such as electron diffraction, and X-ray and IR spectroscopy. Finally, the latest developments in quantum control (in both theory and experiment) and the experimental pulse-shaping techniques are described.
Photodissociation and Charge Transfer Dynamics of Negative Ions Studied with Femtosecond Photoelectron Spectroscopy
Author: Martin Thomas ZanniTime-resolved Photoelectron Spectroscopy and Imaging Studies of Anion Dynamics
Author: Alison Virginia DavisPublisher:
ISBN:
Category :
Languages : en
Pages : 362
Book Description