Author: Mark David MoserPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Studies of Vibrational Energy Transfer and Photodissociation Dynamics
Author: Mark David MoserEnergy Transfer and Vibrationally Mediated Photodissociation in Liquids
Author: F. CrimPublisher:
ISBN:
Category :
Languages : en
Pages : 11
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.)
Photodissociation Dynamics
Author: Reinhard SchinkePublisher: Cambridge University Press
ISBN: 9780521484145
Category : Science
Languages : en
Pages : 446
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.
The Dynamics of Vibrationally Excited Molecules
Author: C. B. MoorePublisher:
ISBN:
Category :
Languages : en
Pages : 7
Book Description
This work studies the transfer of vibrational energy among molecular degrees of freedom and the chemical reactions of vibrationally excited molecules. By resolving the dependence of energy transfer and reaction processes on quantum numbers the mechanism of and forces involved in these processes are identified. Keywords: Photofragment spectroscopy; Vibrational energy transfer; Matrix isolation; Photodissociation; Vibrational photochemistry.
Experimental Studies of Energy Transfer Dynamics Using Pulsed Molecular Beams
Author: Mark Arles HoffbauerPublisher:
ISBN:
Category : Chemical kinetics
Languages : en
Pages : 596
Book Description
Ultrafast Studies of Photodissociation in Solution
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 126
Book Description
Photodissociation of M(CO)6 (M=Cr, Mo, W) and the formation of solvated M(CO)5·S complex was studied in cyclohexane; rate-limiting step is vibrational energy relaxation from the new bond to the solvent. For both M=Cr and Mo, the primary relaxation occurs in 18 ps; for Cr, there is an additional vibrational relaxation (150 ps time scale) of a CO group poorly coupled to other modes. Relaxation of M=W occurs in 42 ps; several possible mechanisms for the longer cooling are discussed. Vibrational relaxation is also investigated for I2− and IBr− in nonpolar and slightly polar solvents. Attempts were made to discover the mechanism for the fast energy transfer in nonpolar solvent. The longer time scale dynamics of I3− and IBr2− were also studied; both formed a metastable complex following photodissociation and 90-95% return to ground state in 100 ps, implying a barrier to recombination of 4.3 kcal/mol and a barrier to escape of e".5 kcal/mol. The more complex photochemistry of M3(CO)12 (M=Fe, Ru) is also investigated, using visible and ultraviolet radiations, dissociation, geminate recombination, vibrational relaxation, and bridging structures and their reactions were studied. Attempts were made to extend ultrafast spectroscopy into the mid-infrared, but signal-to-noise was poor.
Studies in Vibrational Energy Transfer
Author: Robert Leonard BrownStudies of Vibrational Energy Transfer of Small Molecules
Author: C. Tom Wickham-JonesPublisher:
ISBN:
Category : Energy transfer
Languages : en
Pages : 624
Book Description
Photodissociation and Energy Transfer
Author: Julie Alexandra MuellerPublisher:
ISBN:
Category :
Languages : en
Pages : 456
Book Description
Studies of Vibrational Energy Transfer of Small Molecules
Author: C. Tom Wickham-JonesPublisher:
ISBN:
Category : Energy transfer
Languages : en
Pages : 0
Book Description