نتایج جستجو برای: vibrational spectroscopy

تعداد نتایج: 185545  

1998
David E. Powers Michael B. Pushkarsky Min-Chieh Yang Terry A. Miller

The CF3S radical has been investigated using the LIF and fluorescence depletion techniques. The vibrational structure of the first excited à A1 state has been assigned. The photodissociation process at energies above the origin of the à state has been characterized by fluorescence temporal decay and fluorescence depletion spectroscopy. Above the photodissociation threshold the ratio of the rate...

2002
Christoph Scheurer Shaul Mukamel

We survey the principles for the design of multidimensional vibrational spectroscopies that draw upon the analogy with liquid or solid state NMR and EPR spectroscopy. The much faster time-scales and the different energy regime in laser spectroscopy provide additional possibilities that lack magnetic spectroscopy counterparts. We also discuss the notion of through-bond vs through-space couplings...

1997
A. Tokmakoff M. J. Lang D. S. Larsen G. R. Fleming S. Mukamel

Two-dimensional fifth-order Raman spectroscopy has the ability to probe nonlinear interactions between well defined vibrational motions in liquids. It can reveal the nonlinear dependence of the molecular polarizability on vibrational coordinates, intermolecular interaction-induced effects, and anharmonic couplings between modes. We use this technique to probe these interactions at an intramolec...

Journal: :Science 2008
Philipp Gruene David M Rayner Britta Redlich Alexander F G van der Meer Jonathan T Lyon Gerard Meijer André Fielicke

The catalytic properties of gold nanoparticles are determined by their electronic and geometric structures. We revealed the geometries of several small neutral gold clusters in the gas phase by using vibrational spectroscopy between 47 and 220 wavenumbers. A two-dimensional structure for neutral Au7 and a pyramidal structure for neutral Au20 can be unambiguously assigned. The reduction of the s...

2001
Martin GRUEBELE Mark POLAK Richard J. SAYKALLY

The lowest six vibrational hot bands of CF+ have been measured in a heIium/CsF, discharge by velocity moduiation laser spectroscopy. A total of 56 transitions has been fitted to Dunham expansion for v = O-7, yielding the parameters: we = 1792.6654(18) cm-*, Be = 1.7204176(75) cm-‘, r, = 13.22968(54) cm-‘, and D,, = 62086(30) cm-‘. The rotational temperature of CFC in the plasma is near 650 K an...

2003
Ji-Xin Cheng X. Sunney Xie

Coherent anti-Stokes Raman scattering (CARS) microscopy permits vibrational imaging with high-sensitivity, high speed, and three-dimensional spatial resolution. We review recent advances in CARS microscopy, including experimental design, theoretical understanding of contrast mechanisms, and applications to chemical and biological systems. We also review the development of multiplex CARS microsp...

2011
Jung-Fu Lin Ercan E. Alp Alexander F. Goncharov

Herein is presented a review of recent technical advances in Raman and nuclear resonance spectroscopy (both Mössbauer spectroscopy and nuclear resonant inelastic Xray scattering spectroscopy (NRIXS)), as they have great implications for geoscience. Optical and X-ray spectroscopies probe different momentum and energy transfers caused by interactions between the incident light and the lattice, ma...

As cancer is the top killer diseases in the world, the scientists and researchers have been searching the new drugs and remedy methods. Most of the anticancer drugs are organic compounds which were approved by the FDA while metallodrugs are very rare. In the present time, some palladium and rhodium complexes are going to use as anticancer molecules. The palladium (II) complex has higher antican...

Journal: :The journal of physical chemistry. A 2007
Xiaohu Li Virginia E Teige Srinivasan S Iyengar

In this study, we construct the hydroxide water cluster, OH-(H2O)6, that (a) could support a stable hydroxide ion with a four-coordinated (pentavalent) hydroxide oxygen and (b) displays hydroxide ion migration. We study the energetic stability and dynamical evolution of the system at different internal temperatures and analyze the corresponding "dynamically averaged" vibrational density of stat...

Journal: :Physical review letters 2003
John B Asbury Tobias Steinel C Stromberg K J Gaffney I R Piletic Alexi Goun M D Fayer

Hydrogen bond dynamics are explicated with exceptional detail using multidimensional infrared vibrational echo correlation spectroscopy with full phase information. Probing the hydroxyl stretch of methanol-OD oligomers in CCl4, the dynamics of the evolving hydrogen bonded network are measured with ultrashort (<50 fs) pulses. The data along with detailed model calculations demonstrate that vibra...

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