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The Energetics And Dynamics Of Free Radicals Ions And Clusters Progress Report
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Book Synopsis The Energetics and Dynamics of Free Radicals, Ions, and Clusters. Progress Report by :
Download or read book The Energetics and Dynamics of Free Radicals, Ions, and Clusters. Progress Report written by and published by . This book was released on 1994 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: The structure and energetics of free radicals, ions, and clusters have been investigated by photoelectron photoion coincidence (PEPICO) and analyzed with the aid of ab initio molecular orbital and statistical theory (RRKM) calculations. The two major themes are the quantitative analysis of unimolecular reactions with no adjustable parameters, and the study of cluster ion dissociation processes. Molecules (or free radicals) were prepared in a molecular beam so that they are translationally and vibrationally cold. The translational temperature was calculated from the measured time of flight (TOF) peak width, while the vibrational temperature was determined from the shift in the dissociation onset. Free radicals are produced by pyrolysis in the nozzle, and subsequent cooling of the free radicals is demonstrated. Ion dissociation rates in the range from 104 to 107 sec−1 are measured from the asymmetric TOF distribution. This method was used to measure the dissociation rates of a number of cold and warm ions, among them HCl (DCl) loss from C2H5Cl (C2D5Cl), a reaction that proceeds via tunneling. The analysis of the butene ion dissociation provided information about the role of angular momentum in dissociation reactions. This dissociative ionization of ethylene clusters demonstrated that ethylene dimer ions rearranged to butene ions prior to dissociation. Finally, a new value for the t-butyl ion heat of formation, which corrects a 15 kJ/mol error in the previous value, was obtained from the 0 K breakdown diagram of t-butyl iodide.
Book Synopsis The Energetics and Dynamics of Free Radicals, Ions, and Clusters. Progress Report, April 1992--March 1993 by :
Download or read book The Energetics and Dynamics of Free Radicals, Ions, and Clusters. Progress Report, April 1992--March 1993 written by and published by . This book was released on 1993 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Structure and energetics of free radicals, ions, and clusters are being investigated by photoelectron photoion coincidence and analyzed using ab initio molecular orbital and statistical theory (RRKM). Molecules or free radicals are prepared in a molecular beam. Translational temperature is found from measured time of flight peakwidth; the vibrational temperature, from shift in dissociation onset. Free radicals are produced by pyrolysis in the nozzle; their subsequent cooling is demonstrated. Ion dissociation rates in the range from 104 to 107 s−1 are measured from the asymmetric TOF distribution; this method was used to measure the dissociation rates of cold and warm butene ions. 2 figs.
Book Synopsis The Energetics and Dynamics of Free Radicals, Ions, and Clusters. Progress Report, August 1, 1991--March 31, 1992 by :
Download or read book The Energetics and Dynamics of Free Radicals, Ions, and Clusters. Progress Report, August 1, 1991--March 31, 1992 written by and published by . This book was released on 1992 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The structure and energetics of free radicals, ions, and clusters have been investigated by photoelectron photoion coincidence (PEPICO) and analyzed with ab initio molecular orbital and statistical theory RRKM calculations. In these experiments, molecules are prepared in a molecular beam so that their internal as well as translational energies are cooled to near O K. The coincidence condition between energy analyzed electrons and their corresponding ions insures that the ions are energy selected. The primary experimental information includes ionization and fragment ion appearance energies, and the ion time of flight (TOF) distributions. The latter are obtained by using the energy selected electron as a start signal and the ion as the stop signal. These types of experiments allow us to measure the ion dissociation rates in the 104 to 107 sec −1 range. Such ions are commonly referred to a metastable ions. In addition, the TOF peak widths are related to the release of translational energy in the ion dissociation process. Perhaps the most important advance during the past year has been in the study of cluster photoionization. We have developed an experimental method for differentiating similar mass cluster ions based on the kinetic energy of the ions measured by TOF.
Book Synopsis The Energetics and Dynamics of Free Radicals, Ions, and Clusters by :
Download or read book The Energetics and Dynamics of Free Radicals, Ions, and Clusters written by and published by . This book was released on 1992 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The structure and energetics of free radicals, ions, and clusters have been investigated by photoelectron photoion coincidence (PEPICO) and analyzed with ab initio molecular orbital and statistical theory RRKM calculations. In these experiments, molecules are prepared in a molecular beam so that their internal as well as translational energies are cooled to near O K. The coincidence condition between energy analyzed electrons and their corresponding ions insures that the ions are energy selected. The primary experimental information includes ionization and fragment ion appearance energies, and the ion time of flight (TOF) distributions. The latter are obtained by using the energy selected electron as a start signal and the ion as the stop signal. These types of experiments allow us to measure the ion dissociation rates in the 104 to 107 sec −1 range. Such ions are commonly referred to a metastable ions. In addition, the TOF peak widths are related to the release of translational energy in the ion dissociation process. Perhaps the most important advance during the past year has been in the study of cluster photoionization. We have developed an experimental method for differentiating similar mass cluster ions based on the kinetic energy of the ions measured by TOF.
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Book Synopsis Scientific and Technical Aerospace Reports by :
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Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1995 with total page 602 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Book Synopsis ERDA Energy Research Abstracts by : United States. Energy Research and Development Administration
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Book Synopsis Publications of the National Institute of Standards and Technology ... Catalog by : National Institute of Standards and Technology (U.S.)
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Book Synopsis Winter Waterfront : Year-round Use in Metropolitan Toronto by : Xenia Klinger
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Download or read book Energy Research Abstracts written by and published by . This book was released on 1983 with total page 756 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes all works deriving from DOE, other related government-sponsored information and foreign nonnuclear information.
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Book Synopsis Annual Report 1989-90 by : New Brunswick. Department of Transportation
Download or read book Annual Report 1989-90 written by New Brunswick. Department of Transportation and published by . This book was released on 1991 with total page 1272 pages. Available in PDF, EPUB and Kindle. Book excerpt: General activity review of associated branches and agencies to the Department which includes corporate securities registrations, a list of tenders received, and general financial data. Branches and agencies reviewed are responsible for motor vehicle activity, highway construction, traffic engineering, telecommunications and public utilities.
