Photodissociation Dynamics in a Pulsed Molecular Beam PDF Download
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Author: Richang Lu
Publisher:
ISBN:
Category :
Languages : en
Pages : 27
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Book Description
The ArF laser photodissociation of C2N2, C1CN and BrCN have been studied in a pulsed beam. Comparisons are made between these results and the radical product distirbutions measured in an effusive beam. Comparisons are also made between the effects of cooling by expansion in argon and expansion in methane. The later is known to more effectively cool vibrational modes in the parent molecule. (Author).
Author: Richang Lu
Publisher:
ISBN:
Category :
Languages : en
Pages : 27
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Book Description
The ArF laser photodissociation of C2N2, C1CN and BrCN have been studied in a pulsed beam. Comparisons are made between these results and the radical product distirbutions measured in an effusive beam. Comparisons are also made between the effects of cooling by expansion in argon and expansion in methane. The later is known to more effectively cool vibrational modes in the parent molecule. (Author).
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
A description is presented of a study of the photodissociation dynamics of molecules in a molecular beam. Photo-fragmentation translational spectroscopy has been utilized to observe the photodissociation dynamics of ozone. Using a supersonic molecular beam and a 10 nanosecond pulsed laser at lambda = 266 nm, the velocities of the fragment products are measured by the method of time of flight. The resolution of the time of flight spectrum of ozone is sufficiently high that the electronic and vibrational states are clearly resolved and identified. Above the threshold (lambda 310 nm), the quantum yield for the production of O(1D) has been estimated in the past to be unity for the process O3 (1A1) + h.nu.)lambda 300 nm) .--. O3(1B2) .--. O2(1.delta./sub g/) + O(1D). However a small production of O2 (3.sigma./sub g/−) + O(3P) has been observed in this study. The O2(1.delta./sub g/) product yields four vibrational states (v = 0, 1, 2, 3) which yields a vibrational temperature of 2700°K along with narrow energy distributions of rotational levels. These energy distributions are compared with photodissociation models along with the polarization dependence of the dissociative process which was also measured. 143 references.
Author: Urmi Ray
Publisher:
ISBN:
Category :
Languages : en
Pages : 290
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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: Roger Campargue
Publisher: Springer Science & Business Media
ISBN: 3642568009
Category : Science
Languages : en
Pages : 1013
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Book Description
This title covers the state of the art in this field both theoretically and experimentally. With contributions from leading researchers including several Nobel laureates, it represents a long-lasting source of reference on all aspects of fundamental research into or using atomic and molecular beams.
Author: J. Matthew Hutchison
Publisher:
ISBN:
Category :
Languages : en
Pages : 296
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Book Description
Author: Mark Douglas Nachbor
Publisher:
ISBN:
Category :
Languages : en
Pages : 374
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Book Description
Author: Mark Arles Hoffbauer
Publisher:
ISBN:
Category : Chemical kinetics
Languages : en
Pages : 596
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Book Description
Author: Cheuk-Yiu Ng
Publisher: World Scientific
ISBN: 9812813470
Category : Science
Languages : en
Pages : 1415
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Book Description
Owing to the advances of vacuum ultraviolet and ultrafast lasers and third generation synchrotron sources, the research on photoionization, photoelectrons, and photodetachment has gained much vitality in recent years. These new light sources, together with ingenious experimental techniques, such as the coincidence imaging, molecular beam, pulsed field ionization photoelectron, mass-analyzed threshold ion, and pulsed field ion pair schemes, have allowed spectroscopic, dynamic, and energetic studies of gaseous species to a new level of detail and accuracy. Profitable applications of these methods to liquids are emerging.This invaluable two-volume review consists of twenty-two chapters, focusing on recent developments in photoionization and photodetachment studies of atoms; molecules, transient species, clusters, and liquids.
Author: Cheuk-Yiu Ng
Publisher: World Scientific
ISBN: 9789810204303
Category : Science
Languages : en
Pages : 590
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Book Description
This monograph reviews the recent progress in vacuum ultraviolet (VUV) photoionization and photodissociation processes. Photoionization, photoelectron, and fluorescence spectroscopic techniques have played an important role in revealing the photoionization and photodissociation dynamics of molecules in the vacuum ultraviolet region and in providing accurate energetic and spectroscopic information of ions as well as neutral molecules. The book represents the first detailed review of major experimental developments in the studies of single vacuum ultraviolet photon ionization and dissociation processes of gaseous molecules and clusters.
