News tagged with atomic level
Technique allows researchers to examine how materials bond at the atomic level
(PhysOrg.com) -- An approach pioneered by researchers at North Carolina State University gives scientists new insight into the way silicon bonds with other materials at the atomic level. This technique could lead to improved ...
Oct 07, 2010 |
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CERN scientists confine antihydrogen atoms for 1000 seconds
(PhysOrg.com) -- Seventeen minutes may not seem like much, but to physicists working on the Antihydrogen Laser Physics Apparatus (ALPHA) project at the CERN physics complex near Geneva, 1000 seconds is nearly ...
May 04, 2011 |
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Researchers discover how key enzyme repairs sun-damaged DNA
Researchers have long known that humans lack a key enzyme -- one possessed by most of the animal kingdom and even plants -- that reverses severe sun damage.
Medicine & Health / Medical research
Jul 25, 2010 |
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Scientists view a quantum jump in real time
(PhysOrg.com) -- For more than two decades, scientists have been "watching" electrons in atoms make the jump between energy levels in real time. "Atoms have energy levels, and when electrons 'jump' from one level to another, ...
Apr 11, 2011 |
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Graphene Yields Secrets to Its Extraordinary Properties
(PhysOrg.com) -- Applying innovative measurement techniques, researchers from the Georgia Institute of Technology and the National Institute of Standards and Technology have directly measured the unusual energy ...
May 14, 2009 |
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New picture of atomic nucleus emerges
(PhysOrg.com) -- When most of us think of an atom, we think of tiny electrons whizzing around a stationary, dense nucleus composed of protons and neutrons, collectively known as nucleons. A collaboration between ...
Mar 02, 2012 |
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Does weak equivalence break down at the quantum level?
(PhysOrg.com) -- One of the givens in physics is the weak equivalence principle. This principle has been considered solid since Einstein proposed that it is not possible to detect the difference between uniform acceleration ...
Dec 08, 2009 |
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An energy-saving magnetic fridge? Perhaps, but first some basic research
(PhysOrg.com) -- Forget the magnets on your fridge. How about a magnet in your fridge, one that keeps your leftover pizza cold while consuming less energy than today’s refrigerators?
Jul 05, 2010 |
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Caltech scientists film photons with electrons
(PhysOrg.com) -- Techniques recently invented by researchers at the California Institute of Technology -- which allow the real-time, real-space visualization of fleeting changes in the structure of nanoscale ...
Dec 16, 2009 |
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Researchers discover source for generating 'green' electricity
University of Minnesota engineering researchers in the College of Science and Engineering have recently discovered a new alloy material that converts heat directly into electricity. This revolutionary energy conversion method ...
Jun 22, 2011 |
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Physicists get an up-close look at synthetic quantum materials
(PhysOrg.com) -- Physicists at Harvard University have, for the first time, tracked individual atoms in a gas cooled to extreme temperatures as the particles reorganized into a crystal, a process driven by ...
Jun 17, 2010 |
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Researchers Develop Material That Could Boost Data Storage, Save Energy
(PhysOrg.com) -- North Carolina State University engineers have created a new material that would allow a fingernail-size computer chip to store the equivalent of 20 high-definition DVDs or 250 million pages of text, far ...
Nanotechnology / Nanomaterials
Oct 20, 2009 |
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A new class of electron interactions in quantum systems
Physicists at the University of New South Wales have observed a new kind of interaction that can arise between electrons in a single-atom silicon transistor.
Jan 23, 2012 |
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'Air laser' may sniff bombs, pollutants from a distance (w/ Video)
Princeton University engineers have developed a new laser sensing technology that may allow soldiers to detect hidden bombs from a distance and scientists to better measure airborne environmental pollutants ...
Jan 28, 2011 |
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Record measurement of extremely small magnetic fields
Researchers at the research center QUANTOP at the Niels Bohr Institute at the University of Copenhagen (Denmark) have constructed an atomic magnetometer, which has achieved the highest sensitivity allowed ...
Apr 12, 2010 |
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Perturbation theory (quantum mechanics)
In quantum mechanics, perturbation theory is a set of approximation schemes directly related to mathematical perturbation for describing a complicated quantum system in terms of a simpler one. The idea is to start with a simple system for which a mathematical solution is known, and add an additional "perturbing" Hamiltonian representing a weak disturbance to the system. If the disturbance is not too large, the various physical quantities associated with the perturbed system (e.g. its energy levels and eigenstates) can, from considerations of continuity, be expressed as 'corrections' to those of the simple system. These corrections, being 'small' compared to the size of the quantities themselves, can be calculated using approximate methods such as asymptotic series. We can therefore study the complicated system based on our knowledge of the simpler one.
For more information about Perturbation theory (quantum mechanics), read the full article at
Wikipedia.
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