Download or read book Resonant Multiphoton Ionization Spectra of Molecules and Molecular Fragments Technical Progress Report written by and published by . This book was released on 1997 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Objectives of this research are the development and application of theoretical techniques for studying several resonant multiphoton ionization processes in molecules. Specific problems of interest pertain to experimental studies of such spectra in which the photoelectron energy and angular distributions are determined.

Download or read book Resonant Multiphoton Ionization Spectra of Molecules and Molecular Fragments Annual Technical Report October 1987 September 1988 written by and published by . This book was released on 1988 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of the research under this contract is to carry out studies of resonant enhanced multiphoton ionization (REMPI) processes in molecules. In the (n+1)-REMPI process of interest an atom or molecule in a specific initial state absorbs n photons making a transition to an intermediate state from which it is subsequently ionized by absorption of an additional photon. The studies are designed to provide a quantitatively robust analysis and prediction of key spectral features in several ongoing experimental studies and potentially practical applications of this technique. The specific problems of interest to the authors in these studied are (1) the vibrational distributions of ions that can be expected in REMPI of small molecules and molecular fragments with particular emphasis on their non-Franck-Condon behavior. Such non-Franck-Condon behavior introduces serious complications in the use of the technique for state-specific production of ions, e.g., O2([nu]) and OH([nu]), and in the extraction of state populations from REMPI signals, (2) rotational distributions of ions that can be produced in various REMPI schemes and how these distributions can be tuned by choice of the resonant state and influenced by the molecular character of the photoelectron, and (3) the circular dichroism in photoelectron angular distributions, i.e., the difference in photoelectron angular distributions produced by right- and left-circularly polarized, and their use as a probe of molecular alignment. Here the author will summarize the progress that has been made to date in the studies of these features and applications of REMPI of molecules and molecular fragments. A significant feature of these studies, which will be explicitly assumed throughout the discussion below, is that they are carried out using quantitatively reliable molecular photoelectron orbitals.

Download or read book Resonance Enhanced Multiphoton Ionization Spectra of Molecules and Molecular Fragments Annual Technical Report March 1991 February 1992 written by and published by . This book was released on 1993 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Resonance Enhanced Multiphoton Ionization (REMPI) utilizes pulsed laser radiation to prepare a molecule in an excited state via absorption of one or more photons and to subsequently ionize that state before it can decay. The overall objective of this effort is to carry out theoretical studies of these REMPI processes in molecules and molecular fragments which are designed to provide a robust analysis and prediction of key spectral features of interest in several experimental studies and applications of this technique. A specific and very important objective of the effort is to predict the vibrational and rotational ion distributions which result from REMPI of representative molecules and to understand the underlying mechanisms that give use to these ion distributions. The author highlights progress made during this period.

Download or read book Resonance Enhanced Multiphoton Ionization Spectra of Molecules and Molecular Fragments Annual Progress Report March 1992 February 1993 written by and published by . This book was released on 1993 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this report, the author will review the progress made in his studies of ion rotational distributions resulting from resonance enhanced multiphoton ionization of excited electronic states and from single-photon ionization of ground electronic states of jet-cooled molecules by coherent VUV and XUV radiation. To do so he will select a few examples from his studies which serve to highlight his progress and to identify the background and significance of the specific spectral features and systems he has chosen to study.

Download or read book Resonance Enhanced Multiphoton and Single photon Ionization of Molecules and Molecular Fragments Annual Technical Report May 1 1994 April 30 1995 written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The overall objective of this work is to carry out quantitative theoretical studies of these laser-driven ionization processes in molecules so as to provide both a robust description of key spectral features of interest in applications and related experiments and needed insight into these spectra. A major focus of this effort is combined theoretical-experimental studies of molecular ion spectra which are being widely studied by the zero-kinetic-energy (ZEKE) technique. This ZEKE technique, which is base3d on pulsed-field ionization (PFI) of very high Rydberg states, makes it possible to obtain ion distributions with sub-wavenumber resolution and is clearly opening up entirely new vistas in studies of molecular ionization. Some highlights of the progress include: (1) The author has extended the theoretical formulation and computational procedures used in these studies of molecular ionization spectra to general polyatomic systems; (2) He has completed combined theoretical-experimental studies of the molecular ion distributions for photoionization of H[sub 2]S, H[sub 2]CO, and CH[sub 3] by coherent VUV radiation; (3) He has carried out the first calculations of the molecular ion rotational distributions for electronically excited states of NO[sup+] (a[sup 3][Sigma][sup+]) and CO[sup+] (A[sup 2][Pi]); (4) he has also completed calculations of the ion rotational distributions for laser ionization of the small prototypical radicals OH, NH, and CH; and (5) Extensions of the studies of molecular photoionization processes of interest here to large polyatomic molecules are computationally quite demanding. These computational demands arise primarily from complexities associated with the quantum mechanical equations which must be solved to obtain the photoelectron wavefunctions required in these studies. To meet these computational needs the author is currently developing strategies for carrying out these calculations on massively parallel computers such as the Intel Paragon and Cray T3D.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Download or read book Photoionization and Photo Induced Processes in Mass Spectrometry written by Ralf Zimmermann and published by John Wiley & Sons. This book was released on 2021-07-06 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides comprehensive coverage of laser-induced ionization processes for mass spectrometry analysis Drawing on the expertise of the leading academic and industrial research groups involved in the development of photoionization methods for mass spectrometry, this reference for analytical scientists covers both the theory and current applications of photo-induced ionization processes. It places widely used techniques such as MALDI side by side with more specialist approaches such as REMPI and RIMS, and discusses leading edge developments in ultrashort laser pulse desorption, to give readers a complete picture of the state of the technology. Photoionization and Photo-Induced Processes in Mass Spectrometry: Fundamentals and Applications starts with a complete overview of the fundamentals of the technique, covering the basics of the gas phase ionization as well as those of laser desorption and ablation, pulse photoionization, and single particle ionization. Numerous application examples from different analytical fields are described that showcase the power and the wide scope of photo ionization in mass spectrometry. -The first general reference book on photoionization techniques for mass spectrometry -Examines technologies and applications of gas phase resonance-enhanced multiphoton ionization mass spectrometry (REMPI-MS) and gas phase resonance ionization mass spectrometry (RIMS) -Provides complete coverage of popular techniques like MALDI -Discusses the current and potential applications of each technology, focusing on process and environmental analysis Photoionization and Photo-Induced Processes in Mass Spectrometry: Fundamentals and Applications is an excellent book for spectroscopists, analytical chemists, photochemists, physical chemists, and laser specialists.

Download or read book Energy Research Abstracts written by and published by . This book was released on 1992 with total page 806 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Cities and Their Vital Systems written by Advisory Committee on Technology and Society and published by National Academies Press. This book was released on 1989 with total page 1298 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cities and Their Vital Systems asks basic questions about the longevity, utility, and nature of urban infrastructures; analyzes how they grow, interact, and change; and asks how, when, and at what cost they should be replaced. Among the topics discussed are problems arising from increasing air travel and airport congestion; the adequacy of water supplies and waste treatment; the impact of new technologies on construction; urban real estate values; and the field of "telematics," the combination of computers and telecommunications that makes money machines and national newspapers possible.

Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1974-07 with total page 978 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Research in Progress written by United States. Army Research Office and published by . This book was released on 1984 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vols. for 1977- consist of two parts: Chemistry, biological sciences, engineering sciences, metallurgy and materials science (issued in the spring); and Physics, electronics, mathematics, geosciences (issued in the fall).

Download or read book Molecular Detection Using Rydberg Autoionizing and Cluster States Progress Report written by and published by . This book was released on 1990 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: The author reports on investigations of multiphoton ionization spectroscopy in pure clusters of aromatic molecules and mixed clusters of an aromatic molecule with a rare gas atom. Conditions needed for efficient production of ion clusters are discussed. Experimental results that establish geometry of naphthalene and benzene clusters are described.

Download or read book Journal of Research of the National Bureau of Standards written by United States. National Bureau of Standards and published by . This book was released on 1980 with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Research in Progress written by and published by . This book was released on 1983 with total page 644 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Multiphoton Ionization of Laser Desorbed Neutral Molecules in a Fourier Transform Ion Cyclotron Resonance Mass Spectrometer written by Jeffrey A. Zimmerman and published by . This book was released on 1990 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Resonant multiphoton ionization of laser desorbed non-volatile samples has been achieved in a Fourier transform ion cyclotron resonance mass spectrometer (FTICR). The detection of iron at the 100 parts-per-million doping level in an indium phosphide compound semiconductor sample and the production of molecular ions for a hexapeptide have been observed in a modified FTICR analyzer cell. A unique three laser experiment has been devised in which infrared muliphoton dissociation of laser desorbed dipeptide ions, formed by resonant multiphoton ionization of laser desorbed neutrals, is performed. Multiphoton ionization (MPI), Laser desorption, Semiconductor materials, Trace analysis, Peptide sequencing, Fourier transform ion cyclotron resonance mass spectrometry. (JG).

Download or read book INIS Atomindex written by and published by . This book was released on 1985 with total page 952 pages. Available in PDF, EPUB and Kindle. Book excerpt: