Results 281 to 290 of about 1,928,900 (335)
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Blue shifts vs red shifts in σ-hole bonding
Journal of Molecular Modeling, 2008Sigma-hole bonding is a noncovalent interaction between a region of positive electrostatic potential on the outer surface of a Group V, VI, or VII covalently-bonded atom (a sigma-hole) and a region of negative potential on another molecule, e.g., a lone pair of a Lewis base.
Jane S, Murray +4 more
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One Shift, Two Shifts, Red Shift, Blue Shift: Reported Election Returns in the 2020 Election
SSRN Electronic Journal, 2021Shifting vote margins in the hours and days following the close of polls was a highlighted issue in the 2020 election. The tendency of vote margins in recent presidential elections to trend in favor of the Democratic presidential candidate as the count proceeds has been previously studied and given the label “blue shift.” We address how these shifts ...
John Curiel +2 more
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Proceedings of the 37th ACM International Conference on the Design of Communication, 2019
Communication scholars employ metaphors to illustrate the ways that knowledge is produced in professional contexts. This poster argues that current metaphors casting professional texts in ecological and economical terms deserve reevaluation. To do this, it uses a content analysis of ethnographic notes from "ride-along" sessions and interviews with ...
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Communication scholars employ metaphors to illustrate the ways that knowledge is produced in professional contexts. This poster argues that current metaphors casting professional texts in ecological and economical terms deserve reevaluation. To do this, it uses a content analysis of ethnographic notes from "ride-along" sessions and interviews with ...
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General Relativity and Gravitation, 1983
Red shifts can turn blue and blue shifts can turn red in real astrophysical situations involving magnetic neutron stars. It is also possible for red shifts and blue shifts to be emitted simultaneously from the same object. With this general relativistic effect, the red shift may be arbitrarily large but the blue shift cannot exceed 1/2.
Jeffrey M. Cohen, Mitchell F. Struble
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Red shifts can turn blue and blue shifts can turn red in real astrophysical situations involving magnetic neutron stars. It is also possible for red shifts and blue shifts to be emitted simultaneously from the same object. With this general relativistic effect, the red shift may be arbitrarily large but the blue shift cannot exceed 1/2.
Jeffrey M. Cohen, Mitchell F. Struble
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Anomalous Blue Shift of Exciton Luminescence in Diamond
Nano Letters, 2022Generally speaking, for a semiconductor, the temperature dependence of excitonic emission corresponds to that of its band gap. However, an anomalous behavior is exhibited by the excitonic luminescence of diamond where as the temperature increases (from 10 to 300 K), its indirect exciton luminescence peak displays a spectral-distinguishable blue shift ...
Lu Cheng +5 more
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Improper, blue-shifting hydrogen bond
Theoretical Chemistry Accounts: Theory, Computation, and Modeling (Theoretica Chimica Acta), 2002The 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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Blue-Shifting Intramolecular C−H···O Interactions
The Journal of Physical Chemistry A, 2007Two model systems, 3-methylacroleine and 3-(difluoromethyl)acroleine, are investigated computationally with respect to the character of the C-H...O interaction in their chelate-type (ZZ) conformers. By selecting the appropriate reference conformers, the C-H...O interaction is shown to result in the increase of the C-H stretching frequency (i.e., in the
Mirosław, Jabłoński +1 more
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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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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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Red and blue shifted hydridic bonds
Journal of Computational Chemistry, 2014By performing MP2/aug‐cc‐pVTZab initiocalculations for a large set of dimer systems possessing a RH 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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Blue shift paradox in selective reflection
AIP Conference Proceedings, 1995Blue shift of selective reflection line predicted theoretically has never been seen in the experiments. To solve this paradox we study the origin of this blue shift in more detail.
T. A. Vartanyan, D. Bloch, M. Ducloy
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