High Resolution Spectroscopic Studies of Metal-containing Molecules PDF Download

Author: Li Baozhong
Publisher:
ISBN:
Category : Iron compounds
Languages : en
Pages : 150

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Author: Anderson Mark Adrian
Publisher:
ISBN:
Category : Alkaline earth metals
Languages : en
Pages : 222

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Author: Jerald Scott Robinson
Publisher:
ISBN:
Category : High resolution spectroscopy
Languages : en
Pages : 278

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Author: Shanshan Yu
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author: Hailing Wang
Publisher:
ISBN:
Category : Chemistry, Physical and theoretical
Languages : en
Pages : 336

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Author: Benjamin Paul Nuccio
Publisher:
ISBN:
Category : Alkaline earth metals
Languages : en
Pages : 152

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Author: Jaan Laane
Publisher: Elsevier
ISBN: 0128112212
Category : Science
Languages : en
Pages : 788

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Frontiers and Advances in Molecular Spectroscopy once again brings together the most eminent scientists from around the world to describe their work at the cutting-edge of molecular spectroscopy. Much of what we know about atoms, molecules and the nature of matter has been obtained using spectroscopy over the last one hundred years or so. Going far beyond the topics discussed in Jaan Laane’s earlier book on the subject, these chapters describe new methodologies and applications, instrumental developments and theory, which are taking spectroscopy into still new frontiers. The robust range of topics once again demonstrates the wide utility of spectroscopic techniques. New topics include ultrafast spectroscopy of the transition state, SERS/far-uv spectroscopy, femtosecond coherent anti-Stokes Raman spectroscopy, high-resolution laser induced fluorescence spectroscopy, Raman spectroscopy and biosensors, vibrational optical activity, ultrafast two-dimensional spectroscopy, biology with x-ray lasers, isomerization dynamics and hydrogen bonding, single molecule imaging, spectra of intermediates, matrix isolation spectroscopy and more. Covers spectroscopic investigations on the cutting edge of science Written and edited by leading experts in their respective fields Allows researchers to access a broad range of essential modern spectroscopy content from a single source rather than wading through hundreds of scattered journal articles

Author: Fang Wang
Publisher:
ISBN:
Category : Chemistry, Physical and theoretical
Languages : en
Pages : 138

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This thesis describes the studies for two groups of molecules in the gas-phase: (a) copper monofluoride (CuF) and copper hydroxide (CuOH); (b) thorium monoxide (ThO) and tungsten carbide (WC). Copper-containing molecules (Group a) are selected to investigate the ionic bonding in transition metal-containing molecules because they have a relatively simple electronic state distribution due to the nearly filled 3d-orbital. ThO and WC (Group b) are in support of particle physics for the determination of electron electric dipole moment (eEDM), de2, the existence of which indicates new physics beyond the Standard Model. The determination of the tiny eEDM requires large electric fields applied to the electron. The 3(Delta)1 states for heavy polar molecules were proposed [E.R. Meyer, J.L. Bohn, and M.P. Deskevich, Phys. Rev. A73, 062108 (2006)] to determine de with the following attractive features: (1) large electric dipole moments; (2) large internal electric fields, Eeff, experienced by valence electrons; (3) nearly degenerate omega-doublets; (4) extremely small magnetic dipole moments. The H3(Delta)1 state for ThO and the X3(Delta)1 state for WC are both good candidates. Spectroscopic parameters (i.e. molecular electric and magnetic dipole moments, omega-doubling parameters, etc) are required for the 3(Delta)1 states of ThO and WC. High resolution optical spectra (linewidth ~50 MHz) of CuF, CuOH, ThO and WC were recorded field-free and in the presence of a static electric field (or magnetic field) using laser ablation source/supersonic expansion and laser induced fluorescence (LIF) detection. The spectra were modeled by a zero-field effective Hamiltonian operator and a Stark (or Zeeman) Hamiltonian operator with various molecular parameters. The determined molecular parameters are compared to theoretical predictions. The small omega-doubling parameter was well determined using the pump/probe microwave optical double resonance (PPMODR) technique with a much higher resolution (linewidth ~60 kHz) than optical spectroscopy. In addition to the above mentioned studies of the two groups of molecules, a resonance enhanced multi-photon ionization (REMPI) combined with a time-of-flight mass spectrometer (TOFMS) has been developed to identify the molecules responsible for observed LIF signals. The operation of this spectrometer has been tested by recording the mass spectrum of Ti/O2 and the REMPI spectrum for TiO using a two-color excitation scheme.

Author: Eizi Hirota
Publisher: Springer Science & Business Media
ISBN: 3642824773
Category : Science
Languages : en
Pages : 245

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It is a great challenge in chemistry to clarify every detail of reaction processes. In older days chemists mixed starting materials in a flask and took the resul tants out of it after a while, leaving all the intermediate steps uncleared as a sort of black box. One had to be content with only changing temperature and pressure to accelerate or decelerate chemical reactions, and there was almost no hope of initiating new reactions. However, a number of new techniques and new methods have been introduced and have provided us with a clue to the examination of the black box of chemical reaction. Flash photolysis, which was invented in the 1950s, is such an example; this method has been combined with high-resolution electronic spectroscopy with photographic recording of the spectra to provide a large amount of precise and detailed data on transient molecules which occur as intermediates during the course of chemical reac tions. In 1960 a fundamentally new light source was devised, i. e. , the laser. When the present author and coworkers started high-resolution spectroscopic stud ies of transient molecules at a new research institute, the Institute for Molecu lar Science in Okazaki in 1975, the time was right to exploit this new light source and its microwave precursor in order to shed light on the black box.

Author: Michael Aaron Flory
Publisher:
ISBN:
Category :
Languages : en
Pages : 624

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Small diatomic and triatomic 3d transition metal species are excellent model systems for understanding metal-ligand interactions important to larger complexes. Because of the unpaired 3d electrons, these radicals often occur in states with high angular momentum (electron spin, orbital, or nuclear spin). Three questions are particularly relevant to studying monosubstituted 3d metal compounds. What are the fundamental geometric, bonding, and electronic properties? How accurately does currentquantum mechanical theory describe the interactions in high spin states? Assuming these molecules may be present in the interstellar medium, what are the precise transition frequencies that can be used for radioastronomy?To answer these questions, pure rotational spectroscopy has been applied to eleven simple molecules containing 3d transition metals. The small radicals were synthesized in the gas phase and examined in situ. Both direct absorption, submillimeter spectroscopy and Fourier transform microwave spectroscopy were used to cover thefrequency range 8-660 GHz. New synthetic techniques, including oven-insulating methods, use of a longitudinal AC discharge, and emphasis on organometallic precursors, were developed to improve reaction yields. Spectra were recorded for four categories of 3d metal compounds: vanadium molecules, cobalt radicals, zinc species, and several monocyanides. Frequently, the data exhibited signs of perturbations either from low-lyingexcited electronic states, a common feature with 3d electrons, or from avoided crossings of hyperfine levels. The data were analyzed using effective Hamiltonians, and spectroscopic constants have been determined for rotational, fine structure, and hyperfine interactions. The measurements haveprovided transition frequencies as references for astronomical studies; these values are accurate to within 50 kHz for direct measurements and usually within 100 kHz for frequencies calculated from determined molecular constants. Rotational constants have been used to establish precise molecular geometries. Fine structure and hyperfine data provided insight into 3d metal bonding properties (molecular orbital composition and electron distribution) and structure of electronic state manifolds. In some cases, it was necessary to develop new terms for the Hamiltonian expressions to accurately describe the interactions observed in the spectra. These terms include deperturbation parameters and the first complete description of lambda-doubling for Phi states.