Some of the techniques being investigated include frequency-degenerate and nearly frequency-degenerate resonant four-wave-mixing (DFWM and NDFWM), and resonant multi-wave mixing (RMWM).Ī high resolution portable spectroscopy system Objectives of this work include development of spectral models of important molecular species needed to perform coherent anti-Stokes Raman spectroscopy (CARS) measurements and the investigation of new nonlinear-optical processes as potential diagnostic techniques. These research activities consist of high-resolution inverse Raman spectroscopy (IRS) and resonant wave-mixing spectroscopy to support the development of nonlinear-optical techniques for temperature and concentration measurements in combustion research. [Sandia National Laboratories, Livermore, CA (United States) High-resolution inverse Raman and resonant-wave-mixing spectroscopyĮnergy Technology Data Exchange (ETDEWEB)
These findings have important consequences for molecular imaging and orbital tomography using high harmonic spectroscopy. By solving the time-dependent Schrodinger equation, either. Such information is encoded in the destructive interferences occurring between the harmonic emissions from the different parts of the molecule. High harmonic spectroscopy gives access to molecular structure with Angstrom resolution. Risoud, Francois Leveque, Camille Labeye, Marie Laser-induced blurring of molecular structure information in high harmonic spectroscopy The HR-US measurements can be performed in small sample volumes (down to droplet size, over broad temperature range, at ambient and elevated pressures, and in various measuring regimes such as automatic temperature ramps, titrations and measurements in flow. The technique does not require optical markers or optical transparency. The application areas of HR-US in research, product development, and quality and process control include analysis of conformational transitions of polymers, ligand binding, molecular self-assembly and aggregation, crystallisation, gelation, characterisation of phase transitions and phase diagrams, and monitoring of chemical and biochemical reactions. It is based on precision measurements of ultrasonic velocity and attenuation in analysed samples. 25 refs., 8 figs., 1 tabĭirectory of Open Access Journals (Sweden)įull Text Available High-resolution ultrasonic spectroscopy (HR-US is an analytical technique for direct and non-destructive monitoring of molecular and micro-structural transformations in liquids and semi-solid materials. Vibrationally-resolved photoelectron spectra of PbSe, As 2, As 4, and ZnCl 2 are shown to demonstrate the performance of the new source.
Coupling the source with our hemispherical electron energy analyzer, we can obtain very high resolution HeIα (584 angstrom) photoelectron spectra of high temperature species. This source has the advantages of: producing an intense, continuous, seeded molecular beam, eliminating the interference of the heating mechanism from the photoelectron measurement. Shirley, D.A.Ī high temperature molecular beam source with electron bombardment heating has been built for high resolution photoelectron spectroscopic studies of high temperature species and clusters. High temperature and high resolution uv photoelectron spectroscopy using supersonic molecular beams The significance of the present spectroscopic results in other related fields such as astronomy and atmospheric chemistry is stressed.
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The molecular and electronic structures of free radicals, intramolecular motions of large amplitudes in some labile molecules, and metastable electronic states of carbenes are given special emphasis. A few molecules are used as typical examples to illustrate the results so far obtained. The radicals studied were mainly generated by discharge-induced reactions. High-resolution, high-sensitivity spectroscopy using CW laser and microwave sources has been applied to free radicals and transient molecules to establish their existence and to explore their properties in detail. International Nuclear Information System (INIS) High-resolution spectroscopy and molecular structure
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