نتایج جستجو برای: hydrogen atom

تعداد نتایج: 183172  

2008
N. Miyauchi A. Kouchi

The reactions of cold H atoms with solid O2 molecules were investigated at 10 K. The formation of H2O2 and H2O has been confirmed by in-situ infrared spectroscopy. We found that the reaction proceeds very efficiently and obtained the effective reaction rates. This is the first clear experimental evidence of the formation of water molecules under conditions mimicking those found in cold interste...

In this work the electrooxidation half-wave potentials of some Benzoxazines were predicted from their structural molecular descriptors by using quantitative structure-property relationship (QSAR) approaches. The dataset consist the half-wave potential of 40 benzoxazine derivatives which were obtained by DC-polarography. Descriptors which were selected by stepwise multiple selection procedure ar...

1997
J. L. Friar

Nuclear-size corrections of order (Zα)5 and (Zα)6 to the S-state levels of hydrogenic atoms are considered. These nuclear-elastic contributions are somewhat smaller than the polarizability (nuclear-inelastic) corrections for deuterium, but are of comparable or larger size for the hydrogen case. For deuterium the (attractive) nonrelativistic (Zα)5 correction to the 2S-1S transition is −0.49 kHz,...

Journal: :Ukrainian Journal of Physics 2019

Using ab initio calculations, the hydrogen desorption from Magnesium hydride (MgH2) was studied. We presented the calculated nuclear quadrupole coupling constants (NQCCs) of hydrogen atom in various systems of MgH2. The effect of interactions of some metal atoms as well as Boron atom with MgH2 host matrix; (MgH2+M) nanostructures (M=Al, Ti, V, Fe, Ni ...

Using ab initio calculations, the hydrogen desorption from Magnesium hydride (MgH2) was studied. We presented the calculated nuclear quadrupole coupling constants (NQCCs) of hydrogen atom in various systems of MgH2. The effect of interactions of some metal atoms as well as Boron atom with MgH2 host matrix; (MgH2+M) nanostructures (M=Al, Ti, V, Fe, Ni ...

Journal: :physical chemistry research 0
zohreh ahadi department of science and engineering, abhar branch, islamic azad university, abhar, iran. yavar taghipour azar department of chemistry, faculty of science, university of zanjan, p.o. box 45195-313, zanjan, iran. muhammad shadman physical chemistry group, department of chemistry, faculty of science, university of zanjan , p.o.box 45195-313, zanjan, iran.

the present paper aims to investigate the role of open metal site metal-organic frameworks (mofs) on hydrogen adsorptivity using periodic boundary condition (pbc) density functional theory (dft). hence, mil-47-m (m = v and fe) were selected and one hydrogen molecule adsorptivity was calculated in different orientations on them. four different chemical sites were identified in every cluster sect...

2017
Shigeki Kawai Tomohiko Nishiuchi Takuya Kodama Peter Spijker Rémy Pawlak Tobias Meier John Tracey Takashi Kubo Ernst Meyer Adam S Foster

The hydrogen atom-the smallest and most abundant atom-is of utmost importance in physics and chemistry. Although many analysis methods have been applied to its study, direct observation of hydrogen atoms in a single molecule remains largely unexplored. We use atomic force microscopy (AFM) to resolve the outermost hydrogen atoms of propellane molecules via very weak C═O⋅⋅⋅H-C hydrogen bonding ju...

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