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Showing 1 to 12 of 3763 entries
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Soil water vapour isotopes identify missing water source for streamside trees

EPSCoR Research Infrastructure Improvement Program AND Program Evaluation

Bowen G, Bowling DR, Oerter EJ.
GSID: -emAxfG1rNYJ
EJ Oerter, G Siebert, DR Bowling, G Bowen - Ecohydrology, 2019 - Wiley Online Library

In a seminal study, Dawson and Ehleringer used deuterium measurements on water to show that boxelder (Acer negundo) and bigtooth maple (Acer grandidentatum) trees growing directly next to a perennial stream in a mountain meadow did not use the...

Towards a field theoretical understanding of kaonic deuterium: leading order retardation effects

Theoretical frames STEM

Epelbaum E, Mai M.
GSID: yMx6KZFK_AQJ
V Baru, E Epelbaum, M Mai, A Rusetsky - Hyperfine Interactions, 2015 - Springer

… field theory (EFT) approach. The largest contribution to the Kd scattering length stems from … A systematic perturbative framework for the calculation of any number of recoil insertions is …

New progress of high current gasdynamic ion source (invited).

The Review of scientific instruments

Skalyga V, Izotov I, Golubev S, Sidorov A, Razin S, Vodopyanov A, Tarvainen O, Koivisto H, Kalvas T.
PMID: 26931934
Rev Sci Instrum. 2016 Feb;87(2):02A716. doi: 10.1063/1.4934213.

The experimental and theoretical research carried out at the Institute of Applied Physics resulted in development of a new type of electron cyclotron resonance ion sources (ECRISs)-the gasdynamic ECRIS. The gasdynamic ECRIS features a confinement mechanism in a magnetic...

Modulation of a Molecular π-Electron System in a Purely Organic Conductor that Shows Hydrogen-Bond-Dynamics-Based Switching of Conductivity and Magnetism.

Chemistry (Weinheim an der Bergstrasse, Germany)

Ueda A, Hatakeyama A, Enomoto M, Kumai R, Murakami Y, Mori H.
PMID: 26311352
Chemistry. 2015 Oct 12;21(42):15020-8. doi: 10.1002/chem.201502047. Epub 2015 Aug 27.

New important aspects of the hydrogen-bond (H-bond)-dynamics-based switching of electrical conductivity and magnetism in an H-bonded, purely organic conductor crystal have been discovered by modulating its tetrathiafulvalene (TTF)-based molecular π-electron system by means of partial sulfur/selenium substitution. The prepared...

Fragmentation behavior of DOTA complexes under different activation conditions.

Journal of mass spectrometry : JMS

Beck S, Trog S, Knizia S, Linscheid MW.
PMID: 28455851
J Mass Spectrom. 2017 Jul;52(7):442-451. doi: 10.1002/jms.3942.

We have investigated the fragmentation behavior of a number of DOTA-metal complexes under collision-induced dissociation, infrared-multiphoton dissociation and higher-energy collisional dissociation activation conditions. Both, positive and negative ion mode electrospray ionization was applied. The results show that characteristic fragmentations...

The Development and Application of Two-Chamber Reactors and Carbon Monoxide Precursors for Safe Carbonylation Reactions.

Accounts of chemical research

Friis SD, Lindhardt AT, Skrydstrup T.
PMID: 26999377
Acc Chem Res. 2016 Apr 19;49(4):594-605. doi: 10.1021/acs.accounts.5b00471. Epub 2016 Mar 21.

Low molecular weight gases (e.g., carbon monoxide, hydrogen, and ethylene) represent vital building blocks for the construction of a wide array of organic molecules. Whereas experimental organic chemists routinely handle solid and liquid reagents, the same is not the...

Evidence for the spontaneous formation of N-heterocyclic carbenes in imidazolium based ionic liquids.

Chemical communications (Cambridge, England)

Daud NMAN, Bakis E, Hallett JP, Weber CC, Welton T.
PMID: 28890962
Chem Commun (Camb). 2017 Oct 18;53(81):11154-11156. doi: 10.1039/c7cc06112a. Epub 2017 Sep 11.

We present a study of the reactions of aldehydes in ionic liquids which gives evidence for the spontaneous formation of N-heterocyclic carbenes in ionic liquids based on 1,3-dialkyl substituted imidazolium cations from the lack of a deuterium isotope effect...

Recovery of Acid-Gas-Degraded Zeolitic Imidazolate Frameworks by Solvent-Assisted Crystal Redemption (SACRed).

ACS applied materials & interfaces

Jayachandrababu KC, Bhattacharyya S, Chiang Y, Sholl DS, Nair S.
PMID: 28949125
ACS Appl Mater Interfaces. 2017 Oct 11;9(40):34597-34602. doi: 10.1021/acsami.7b11686. Epub 2017 Oct 02.

The acid stability of zeolitic imidazolate frameworks (ZIFs) is an important issue hindering their application. Acid-gas damage of ZIFs has been considered irreversible. However, we demonstrate a methodology called solvent-assisted crystal redemption (SACRed) to reverse acid-gas damage to ZIFs...

Pomeranz-Fritsch Synthesis of Isoquinoline: Gas-Phase Collisional Activation Opens Additional Reaction Pathways.

Journal of the American Chemical Society

Banerjee S, Liu F, Sanchez DM, Martínez TJ, Zare RN.
PMID: 28949532
J Am Chem Soc. 2017 Oct 18;139(41):14352-14355. doi: 10.1021/jacs.7b06813. Epub 2017 Oct 04.

We have investigated the gas-phase production of isoquinoline by performing collisional activation on benzalaminoacetal, the first intermediate in the classic solution-phase Pomeranz-Fritsch synthesis of isoquinoline. We have elucidated the reaction pathways in the gas phase using tandem mass spectrometry....

Enantiospecific C-H Activation Using Ruthenium Nanocatalysts.

Angewandte Chemie (International ed. in English)

Taglang C, Martínez-Prieto LM, del Rosal I, Maron L, Poteau R, Philippot K, Chaudret B, Perato S, Sam Lone A, Puente C, Dugave C, Rousseau B, Pieters G.
PMID: 26371960
Angew Chem Int Ed Engl. 2015 Sep 01;54(36):10474-7. doi: 10.1002/anie.201504554.

The activation of C-H bonds has revolutionized modern synthetic chemistry. However, no general strategy for enantiospecific C-H activation has been developed to date. We herein report an enantiospecific C-H activation reaction followed by deuterium incorporation at stereogenic centers. Mechanistic...

Source reconstruction for neutron coded-aperture imaging: A sparse method.

The Review of scientific instruments

Wang D, Hu H, Zhang F, Jia Q.
PMID: 28863656
Rev Sci Instrum. 2017 Aug;88(8):083502. doi: 10.1063/1.4996193.

Neutron coded-aperture imaging has been developed as an important diagnostic for inertial fusion studies in recent decades. It is used to measure the distribution of neutrons produced in deuterium-tritium plasma. Source reconstruction is an essential part of the coded-aperture...

Mass separation of deuterium and helium with conventional quadrupole mass spectrometer by using varied ionization energy.

The Review of scientific instruments

Yu Y, Hu J, Wan Z, Wu J, Wang H, Cao B.
PMID: 27036832
Rev Sci Instrum. 2016 Mar;87(3):035120. doi: 10.1063/1.4944560.

Deuterium pressure in deuterium-helium mixture gas is successfully measured by a common quadrupole mass spectrometer (model: RGA200) with a resolution of ∼0.5 atomic mass unit (AMU), by using varied ionization energy together with new developed software and dedicated calibration...

Showing 1 to 12 of 3763 entries