Results 261 to 270 of about 261,173 (297)
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Molecular contrast in optical coherence tomography by use of a pump–probe technique
Optics Letters, 2003We describe a novel technique for contrast enhancement in optical coherence tomography (OCT) that makes possible molecular-specific imaging for what is believed to be the first time. A pump-probe technique is employed in which a pulsed pump laser is tuned to ground-state absorption in a molecule of interest.
K Divakar, Rao +4 more
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Journal of Agricultural and Food Chemistry, 2013
Triazole fungicides, one category of broad-spectrum fungicides, are widely applied in agriculture and medicine. The extensive use leads to many residues and casts potential detrimental effects on aquatic ecosystems and human health. After exposure of the human body, triazole fungicides may penetrate into the bloodstream and interact with plasma ...
Jing, Zhang +3 more
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Triazole fungicides, one category of broad-spectrum fungicides, are widely applied in agriculture and medicine. The extensive use leads to many residues and casts potential detrimental effects on aquatic ecosystems and human health. After exposure of the human body, triazole fungicides may penetrate into the bloodstream and interact with plasma ...
Jing, Zhang +3 more
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New molecular probe technique for the assessment of ultramicroporous structure
Journal of the Chemical Society, Faraday Transactions, 1993Adsorption–desorption isotherms of nitrogen and especially hydrogen at 18 °C and pressures up to 1 atm have been found to be good molecular probes to assess specifically ultramicroporous carbon structures such as constrictions and other restricted regions that are responsible for the molecular sieving property of these carbons.
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Study of molecular mobility in ultraoriented polypropylene by the spin‐probe technique
Journal of Polymer Science: Polymer Physics Edition, 1985AbstractThe rotational mobility of nitroxide radicals in polypropylene samples with draw ratios varying from 1 to 18 has been studied between 30 and 110°C by the ESR technique. The drop in the rotational frequency with increasing orientation correlates very well with the behavior of various other measures of molecular mobility such as organic vapor ...
C. L. Choy, W. P. Leung, T. L. Ma
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Local Molecular Spectroscopy Using the Evanescent Microwave Probe Technique: Electron Spin Resonance
IEEE Sensors, 2005., 2006A method based on evanescent microwave microscopy (EMM) was developed to spatially resolve small number of electron spin resonant (ESR) transitions in single crystal ruby (Cr3+). The EMM probe operates at a resonance frequency of 3.77 GHz (S-band ESR) in a modulated electromagnetic field in the range of 0.02 to 0.6 Tesla.
M. Tabib-Azar, null Xiying Li, J.A. Mann
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Probing Detonation Physics and Chemistry Using Molecular Dynamics and Quantum Chemistry Techniques
MRS Proceedings, 1995AbstractModem quantum chemistry and molecular dynamics computer codes are powerful tools with which to study the physics and chemistry of energetic materials at the molecular level. Quantum chemistry calculations, on one or two energetic molecules, can give valuable information about the initial steps in their decomposition.
M. D. Cook, J. Fellows, P. J. Haskins
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The Journal of Physical Chemistry, 1985
In this Letter, we report measurements of the picosecond relaxation time of trans-stilbene in S1 under collisionless conditions. By acurate determination of the zero-time in our picosecond pump-probe experiments we obtained r = 3 ± 0.5 ps, which is entirely consistent with our earlier measurements of IVR rates of stilbene in bulbs and beams.
Scherer, N. F. +3 more
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In this Letter, we report measurements of the picosecond relaxation time of trans-stilbene in S1 under collisionless conditions. By acurate determination of the zero-time in our picosecond pump-probe experiments we obtained r = 3 ± 0.5 ps, which is entirely consistent with our earlier measurements of IVR rates of stilbene in bulbs and beams.
Scherer, N. F. +3 more
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Chemical Physics, 1978
Abstract Normal vibrational modes which are broadened by a distribution of frequencies are coherently excited via transient stimulated Raman scattering. The dephasing time of a subgroup of molecules is observed using a new selective k -vector technique.
A. Laubereau, G. Wochner, W. Kaiser
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Abstract Normal vibrational modes which are broadened by a distribution of frequencies are coherently excited via transient stimulated Raman scattering. The dephasing time of a subgroup of molecules is observed using a new selective k -vector technique.
A. Laubereau, G. Wochner, W. Kaiser
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The Journal of Chemical Physics, 1990
Fluorescence lifetimes and rotational reorientation times for four structurally similar dye molecules—three monocations: cresyl violet, nile blue, and oxazine 720 and one neutral but polar: nile red—have been measured by picosecond time-resolved fluorescence depolarization spectroscopy using the single-photon counting technique, in a number of solvents,
G. B. Dutt +3 more
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Fluorescence lifetimes and rotational reorientation times for four structurally similar dye molecules—three monocations: cresyl violet, nile blue, and oxazine 720 and one neutral but polar: nile red—have been measured by picosecond time-resolved fluorescence depolarization spectroscopy using the single-photon counting technique, in a number of solvents,
G. B. Dutt +3 more
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Operando Scanning Electrochemical Probe Microscopy during Electrocatalysis
Chemical Reviews, 2023, Wolfgang Schuhmann, Corina Andronescu
exaly