Sentences with phrase «oxygen atoms at»

Synchrotron - based x-ray absorption spectroscopy for both aluminum and oxygen reveals that the aluminum coordination in the ideal material is a distorted octahedral geometry with oxygen atoms at two, discrete distances from the central aluminum atom.

Scientists at the Department of Energy's Oak Ridge National Laboratory have developed a new oxygen «sponge» that can easily absorb or shed oxygen atoms at low temperatures.

In contrast to previous methods, the bond between the oxygen atom at the tip and copper base is particularly strong, thereby reducing imaging artefacts to a minimum.

Not exact matches

For example, what must be the nature of physical existents such that the composite, the molecule of water, not only consists of one oxygen atom and two hydrogen atoms, but that they are at a particular distance from each other and in a particular three - dimensional pattern?

Researchers looked at the ratios of two forms of oxygen atoms in the minerals deposited in layers in two stalagmites that had formed in a cave in the Himalayan foothills about 200 kilometers north of New Delhi.

Krissansen - Totton explains in more detail: «Having methane and carbon dioxide together is unusual, because carbon dioxide is carbon's most oxidized state, and methane (composed of a carbon atom linked to four hydrogen atoms rather than any oxygen at all) is its least,» he says.

Alternatively, the water at Cabeus may have been created when hydrogen atoms carried by the solar wind slammed into oxygen - rich materials in the lunar surface.

Like hydrogen, oxygen, and iodine, nitrogen normally exists as two - atom molecules in the form of a gas at room temperature.

The ions get out of the Earth's atmosphere because when sunlight or the occasional cosmic ray hits atoms of oxygen (or any other gas) at the edge of space, those atoms can lose an electron, becoming charged.

The researchers also found that at high pressures, oxygen atoms are much more compressible than silicon atoms.

This material, in which carbon substitutes for some of the lattice oxygen atoms, absorbs light at wavelengths below 535 nanometers and has a lower band - gap energy than rutile (2.32 versus 3.00 electron volts).

I knew that heme, the oxygen - carrying molecule in hemoglobin, contained an iron atom within a porphyrin ring (for more information on porphyrin chemistry see this site at Washburn University), but Dr. Datta - Gupta and his laboratory technician attempted to chemically add different metals such as copper, magnesium, or manganese to porphyrins using column chromatography.

«On the surface of nickelate, you have one nickel atom at the center of a square of four oxygen atoms,» Cooper said.

The increase in density, and a corresponding increase in stiffness of the molten material, results because the high pressure found deep within the planet would have forced each silicon atom to have six oxygen neighbors, not the four neighbors typically found at lower pressures.

Hughes and his co-workers also saw plenty of silicon - rich blobs in Cas A, believed to arise from the explosive burning of oxygen atoms into silicon further out from the core at temperatures of perhaps 3 billion degrees.

«The oxygen atoms don't need to move much at all,» Johnson said.

He knew he needed to find metals that were deft at breaking the carbon - hydrogen bonds that are at the heart of methane, ethane, and propane, short hydrocarbons known as alkanes, and then add in oxygen atoms that would transform the alkanes into alcohols.

Early in 1969, Snyder and Buhl set up shop at NRAO's Green Bank Telescope in West Virginia and chose their first target: formaldehyde, an organic molecule made up of two hydrogen atoms and an oxygen atom tethered to an atom of carbon.

They are particularly good at identifying the position of light atoms such as hydrogen, oxygen, carbon and nitrogen in samples.

At the atomic level, in the many batteries that use lithium - nickel - manganese oxide, the manganese and oxygen atoms form orderly rows.

Nitrogen, in the form of nitric oxide (one nitrogen atom and one oxygen atom), has been detected for the first time on the surface of Mars by a team of researchers using the Sample Analysis at Mars (SAM) instrument suite aboard NASA's Curiosity rover, adding to the growing speculation that life could have once flourished on ancient Mars.

Results: When oxygen atoms escape, they change the local electronic structure and cause the voltage to fade in a next - generation battery, according to theoreticians at Pacific Northwest National Laboratory and University College London, UK.

At low pressure, carbon bonds to three oxygen atoms, while silicon bonds to four.

Oxygen atoms (red) are detected at the edge of the flake after air exposure.

Above 140 ° F, myoglobin loses its ability to bind oxygen, and the iron atom at the center of its molecular structure loses an electron.

A little olivine crystal in the Bunbury Basalt, for instance, or whether it's in the lava fields of Hawaii — taking it down to the nitty gritty in theoretical chemistry is the magnesium, iron and oxygen atom, which they do in Year 9 in looking at ionic compounds.

``... this pulls the carbon in one direction and the oxygens in another, so an electromagnetic wave that vibrates at the correct frequency can excite the molecule into a vibrational motion in which the carbon atom moves in the opposite direction to the two oxygen atoms.

Any gas with 3 or more atoms can be a greenhouse gas, (as at least three atoms are necessary for the gas to vibrate and capture the infrared light) so gases made up of one atom (Hydrogen, H) or two atoms (Oxygen, O2) are not greenhouse gases.

Ozone - depleting substances are emitted by human activity at the planet's surface and eventually travel to the stratosphere, where there the chlorine atoms and certain other constituent parts break apart the three oxygen atoms that make up an ozone molecule.

Ozone is one of the criteria air pollutants and is a form of oxygen, the molecule contains three oxygen atoms and has the same chemical structure whether it is found high in the atmosphere or at ground - level.

However, my main point was not so much about the «make up» of ozone but more about the possibility that as long as oxygen atoms and molecules absorb enough energy from UV radiation to alter their structure it may be that they also produce an increase in their heat content, which should be greater at any points nearest to the source — i.e..