Results 221 to 230 of about 13,758 (245)

Associating Physics and Chemistry to Dissociate Molecules

Historical Studies in the Natural Sciences, 2016
A case study of the Clausius-Williamson hypothesis sheds light on the development of the physical sciences during the nineteenth century. In the 1850s, Rudolf Clausius and Alexander William Williamson independently developed similar hypotheses at a time when physics and chemistry were beginning to be considered independent endeavors.
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Sequence Ion Structures and Dissociation Chemistry of Deprotonated Sucrose Anions

Journal of the American Society for Mass Spectrometry, 2018
We investigate the tandem mass spectrometry of regiospecifically labeled, deprotonated sucrose analytes. We utilize density functional theory calculations to model the pertinent gas-phase fragmentation chemistry of the prevalent glycosidic bond cleavages (B1-Y1 and C1-Z1 reactions) and compare these predictions to infrared spectroscopy experiments on ...
Bythell, Benjamin, Rabus, Jordan, Wagoner, Ashley, Abutokaikah, Maha, Maitre, Philippe   +4 more
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Dissociative Pathways in Platinum(ll) Chemistry

Comments on Inorganic Chemistry, 1990
Abstract Steric and electronic factors favor the addition of a fifth ligand to a square planar d8 complex to form five coordinate species either as discrete compounds or reaction intermediates. The search for factors promoting the conversion of the normal associative mode of reaction into a dissociative process has attracted much attention. The attempt
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Orbital specific chemistry: Controlling the pathway in single-molecule dissociation

The Journal of Chemical Physics, 2005
A scanning tunneling microscope (STM) was used to control the pathway of the dissociation of single O2 molecules chemisorbed on Ag(110) at 13K. Tunneling of electrons from the STM tip into the O2 caused dissociation of the molecule, giving rise to two adsorbed O atoms separated along the [11¯0] direction. In contrast, the ejection of electrons from the
J R, Hahn, W, Ho
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The dissociation chemistry of permethylated guanosines as articulated by MS/MS

Tetrahedron Letters, 1993
Abstract Permethylation of covalently modified guanosines is shown to be an effective means of increasing the abundance of structurally significant fragment ions when protonated base ions from nucleosides are subjected to collision-induced dissociation in MS/MS.
John M. Gregson, James A. McCloskey
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The spectrum of a dissociation intermediate of cysteine: a biophysical chemistry experiment

Journal of Chemical Education, 1988
An elegant experiment that integrates the basic concepts of physical and biological chemistry in the study of cysteine.
A. G. Splittgerber, L. L. Chinander
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Dissociative Recombination Chemistry and Plasma Dynamics

2008
Abstract : Advances made in the study of the dissociation dynamics and product branching ratios of energized transient neutral molecules formed by charge-transfer (DCE) and recombination of cations with free electrons (DR) are reviewed. The results obtained include detailed measurements of the three-body dissociation of H3, O4 and sym-triazine (HCN)3 ...
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Use of hydration and dissociation chemistries with the electrolyte–NRTL model

AIChE Journal, 1999
AbstractSound theoretical understanding and accurate mathematical representation of electrolyte solution nonideality were the subject of extensive research efforts for decades. It is demonstrated that these goals can be achieved by incorporation of hydration and partial dissociation chemistries with the semi‐empirical electrolyte NRTL model.
Chau‐Chyun Chen, Paul M. Mathias, Hasan Orbey   +2 more
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Dissociative chemistry of ionic transition metal cluster fragments

Journal of Cluster Science, 1991
The ionic fragments formed by collision-induced dissociation of Mn2(CO) + ions (y=1–10) are reported. The ratio of product ions formed by metal-metal vs. metal-ligand bond cleavage are discussed in terms of the dependence of the metal-metal bond energy on the ...
F. H. Strobel, D. H. Russell
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Molecular ion collision chemistry in CH4 ionization and dissociation

International Journal of Mass Spectrometry, 2016
Abstract The use of the 90° hemispheric electrostatic high resolution analyzer in conjunction with the time-of-flight (TOF) technique allowed us to identify various species associated with the ionization of methane molecular gas by a pulsed fast 19 MeV F4+ beam.
A.T. Hasan, T.J. Gray
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