Results 311 to 320 of about 1,830,967 (340)

Expected Number of Blue-shifts and Red-shifts of Ejected Sources [PDF]

Nature, 1966
Doppler effect in quasar red-shifts and theoretical expected number of blue-shifts and red-shifts of ejected ...
John Faulkner, John Faulkner, Bruce A. Peterson, James E. Gunn   +3 more
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On the Physical Origin of Blue-Shifted Hydrogen Bonds

Journal of the American Chemical Society, 2002
For blue-shifted hydrogen-bonded systems, the hydrogen stretching frequency increases rather than decreases on complexation. In computations at various levels of theory, the blue-shift in the archetypical system, F(3)C-H.FH, is reproduced at the Hartree-Fock level, indicating that electron correlation is not the primary cause.
Lei Liu, H. Bernhard Schlegel, Xiaosong Li   +2 more
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Red and blue shifted hydridic bonds

Journal of Computational Chemistry, 2014
By performing MP2/aug‐cc‐pVTZab initiocalculations for a large set of dimer systems possessing a RH hydridic bond involved in diverse types of intermolecular interactions (dihydrogen bonds, hydride halogen bonds, hydride hydrogen bonds, and charge‐assisted hydride hydrogen bonds), we show that this is rather an elongation than a shortening that a ...
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Spectral blue shift of thermal radiators

SPIE Proceedings, 1998
The traditional concept of graybody in IR application is investigated and new viewpoints are proposed. It is found that the spectral distribution of thermal radiation of a real body with emissivity (epsilon) < 1, compared with that of absolute blackbody, will shift to shortwave region, i.e. the blue shift phenomena will appear.
Yifeng Wang, Chitao Feng
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Red versus blue shifts in trimethylammoiumhexafluorosilicate

Chemical Physics Letters, 2004
Abstract Hartree–Fock and density functional methods have been used to obtain the molecular structure, electron density topography and the vibrational frequencies of trimethylammoiumhexafluorosilicate (TMAHFS). In the isolated molecule the N–H⋯F bond is predicted to be nonlinear with a deviation of 16° from linearity and the SiF 6 2− orients with a
Nilesh R. Dhumal, Shridhar P. Gejji
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Blue-Shifting Hydrogen Bonds

The Journal of Physical Chemistry A, 2002
In this paper we put forward the idea that the various improper, blue-shifting hydrogen bond systems discussed in the literature are all of essentially the same nature and occur because of three ne ...
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Improper, blue-shifting hydrogen bond

Theoretical Chemistry Accounts: Theory, Computation, and Modeling (Theoretica Chimica Acta), 2002
The spectral manifestation and the nature of improper, blue-shifting hydrogen-bonded complexes are entirely different from those of standard hydrogen-bonded complexes. While the latter class of complexes is characterized by an elongation of the X–H bond and a concomitant red shift of the respective stretch frequency, a contraction of the X–H bond and a
Pavel Hobza, Zdenek Havlas
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Inhibition of photobleaching and blue shift in quantum dots

Chemical Communications, 2009
Photobleaching and spectral diffusion (blue shift) of quantum dots at the solid/liquid interface are suppressed by adding mercaptoethylamine.
Huaping Chen, Edward S. Yeung, Edward S. Yeung, Hongwei Gai   +3 more
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Neutral Blue-Shifting and Blue-Shifted Hydrogen Bonds

2006
This is a critical review that, first, covers the most important results in the area of blue-shifting hydrogen bonds including their update list containing more than 80 blue-shifting hydrogen-bonded complexes and, second, attempts to classify them on the equal footing with the classical hydrogen bonds and to partly re-examine their origin by means of ...
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Puzzle of SS433: both a blue shift and a red shift

Physics Today, 1979
Recent observations confirm that a fourteenth-magnitude “peculiar” star in our galaxy is a bizarre object indeed, the like of which has not been seen before. Its spectrum exhibits hydrogen (Balmer) and helium emission lines with red and blue shifts indicating velocities up to 50 000 km/sec (0.17c), and these shifts vary roughly sinusoidally with a ...
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