CF 3 I Photodissociation Dynamics PDF Download
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Author: Julius Yang
Publisher:
ISBN:
Category : Dissociation
Languages : en
Pages : 116
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Author: Julius Yang
Publisher:
ISBN:
Category : Dissociation
Languages : en
Pages : 116
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Book Description
Author: Reinhard Schinke
Publisher: Cambridge University Press
ISBN: 9780521484145
Category : Science
Languages : en
Pages : 446
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Book Description
Photodissociation induced by the absorption of single photons permits the detailed study of molecular dynamics such as the breaking of bonds, internal energy transfer and radiationless transitions. The availability of powerful lasers operating over a wide frequency range has stimulated rapid development of new experimental techniques which make it possible to analyse photodissociation processes in unprecedented detail. This text elucidates the achievements in calculating photodissociation cross-sections and fragment state distributions from first principles, starting from multi-dimensional potential energy surfaces and the Schrödinger equation of nuclear motion. Following an extended introduction in which the various types of observables are outlined, the book summarises the basic theoretical tools, namely the time-independent and the time-dependent quantum mechanical approaches as well as the classical picture of photodissociation. The discussions of absorption spectra, diffuse vibrational structures, the vibrational and rotational state distributions of the photofragments form the core of the book. More specific topics such as the dissociation of vibrationally excited molecules, emission during dissociation, or nonadiabatic effects are also discussed. It will be of interest to graduate students and senior scientists working in molecular physics, spectroscopy, molecular collisions and molecular kinetics.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 38
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Book Description
We present correlated measurements of the CF3 internal energy, the initial electronic excitation, and the final iodine state in the photodissociation of CF31 at 304 nm by using state-selective photofragment translational spectroscopy. The simultaneous determination of the three properties is achieved by measuring the translational energy distribution of the state-selected iodine fragment as a function of its recoil angle with respect to the electric vector of the photolysis laser. We found that the excited state I (2P1/2) atoms are formed predominantly from the parallel 3Q(0)-N transition while the I(2P3/2) atoms are formed from both the perpendicular Q1 - N transition (70%) and the parallel 3Q(0) - N transition (30%) followed by curve crossing to the 1QI state. By comparing the average internal energies of CF3 produced in the two dissociation channels of the 3Q(O)- N excitation at 304 nm with the recent results of Felder at 248 nm, we examine the effect of the photon energy and that of the curve crossing in the dynamics of the vibrational excitation. For the I* channel, we observe a strong photon energy dependence of the CF3 internal excitation, suggesting a strong final state interaction in the dynamics of the 3Q0 potential as suggested by a number of model calculations. The best agreement obtained with the model calculation of van Veen et al. supports the assumption of the dominant involvement of the 1/2 umbrella vibration. For the 3Q(0) component of the I channel, we observe a similar strong photon energy dependence in terms of its slope, but with an enhanced CF3 internal excitation.
Author: M. N. R. Ashfold
Publisher: CRC Press
ISBN:
Category : Science
Languages : en
Pages : 268
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Book Description
Molecular Photodissociation Dynamics was the first title to be published in this series and provides overviews of selected aspects of the subject. The experimental study of photodissociation has been revolutionized by the ready availability of intense, tunable laser sources, operational over a substantial portion of the electromagnetic spectrum, and with parallel developments in theoretical chemistry has opened the way to detailed theoretical study of the fragmentation dynamics of the excited state. This book will therefore be essential reading for those working in this area.
Author: Joseph Isaac Cline (III.)
Publisher:
ISBN:
Category :
Languages : en
Pages : 418
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Book Description
Author: Jonelle Harvey
Publisher: Springer Science & Business Media
ISBN: 3319029762
Category : Science
Languages : en
Pages : 184
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Book Description
Jonelle Harvey's book outlines two related experimental techniques, threshold photoelectron spectroscopy and threshold photoelectron photoion coincidence techniques, which are utilised to investigate small halogenated molecules. All the experiments were conducted at the vacuum ultraviolet beamline of the Swiss Light Source, a synchrotron photon source, which has the advantage over popular laser photon-sources of extreme ease of tunability. Three studies are presented which combine experimental and computational ab initio approaches: studying the fast dissociations of halogenated methanes in order to construct a self-consistent thermochemical network; investigating the fragmentations of fluoroethenes from timebombs, which break apart very slowly but explosively, to fast dissociators; and uncovering how vital conical interactions underpin both the results of photoelectron spectra and dissociation patterns. The details included in this thesis are useful for researchers working in the same field and those readers wishing to obtain a solid introduction into the types of systems encountered in threshold photoelectron photoion coincidence spectroscopy.
Author: Kiyoshi Ueda
Publisher: Springer Nature
ISBN: 9819729149
Category :
Languages : en
Pages : 484
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Author: Jürgen Hinze
Publisher: Springer Science & Business Media
ISBN: 1461336678
Category : Technology & Engineering
Languages : en
Pages : 606
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Book Description
We characterize an isolated molecule by its compos~t~on, i.e. the number and types of atoms forming the molecule, its structure, i.e. the geometrical arrangement of the composite atoms with respect to each other, and its possible, i.e. quantum mechanically allowed, stationary energy states. Conceptually we separate the latter, being aware that this is an approximation, into electronic, vibrational and rotational states, including fine and hyperfine structure splittings. To be sure, there is an intimate relation between molecular structure and molecular energy states, in fact it is this relation we use, when we obtain structural information through spectroscopy, where we determine transitions between various stationary states of the molecule. The concepts above have proven extremely useful in chemistry and spectroscopy, however, the awareness of the limitations of these concepts has grown in recent years with the increasing recognition of (i) fluctional molecules, (ii) multiphoton absorption processes and (iii) influences due to the surroundings on "isolated" molecules.
Author: Kasra Amini
Publisher: Royal Society of Chemistry
ISBN: 1837671141
Category : Science
Languages : en
Pages : 671
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Book Description
Author: Gabriel G. Balint-Kurti
Publisher:
ISBN: 9780952273615
Category : Molecular dynamics
Languages : en
Pages : 43
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Book Description
