Latest Atomic physics Stories

2010-06-25 09:10:47

When light is absorbed by atoms, the electrons become excited. If the light particles, so-called photons, carry sufficient energy, the electrons can be ejected from the atom. This effect is known as photoemission and was explained by Einstein more than hundred years ago. Until now, it has been assumed that the electron start moving out of the atom immediately after the impact of the photon. This point in time can be detected and has so far been considered as coincident with the arrival time...

2010-05-26 10:09:48

Despite a steady improvement in the speed of conventional computers during the last few decades, certain types of problems remain computationally difficult to solve. Quantum computers hold the promise of offering a new route to solving some classes of these problems, such as breaking encryptions. The tremendous computing power of these devices stems from their use of quantum systems, called "qubits," which can exist in a "superposition" of two states at the same time "“ in stark...

2010-05-14 15:00:00

MPQ-LMU scientists demonstrate for the first time exotic multiparticle interactions between ultracold atoms in an artificial crystal of light At extremely low temperatures atoms can aggregate into so-called Bose Einstein conden-sates forming coherent laser-like matter waves. Due to interactions between the atoms fundamental quantum dynamics emerge and give rise to periodic collapses and revivals of the matter wave field. A group of scientists led by Professor Immanuel Bloch (Chair of...

2010-05-07 09:30:00

In an achievement that could help enable fast quantum computers, University of Michigan physicists have built a better Rydberg atom trap. Rydberg atoms are highly excited, nearly-ionized giants that can be thousands of times larger than their ground-state counterparts. As a result of their size, interactions between Rydberg atoms can be roughly a million times stronger than between regular atoms. This is why they could serve as faster quantum circuits, said Georg Raithel, associate chair and...

2010-04-27 08:05:00

CHICAGO, April 27 /PRNewswire/ -- Consider this nightmare: Each night millions of women toss and turn and try to get to sleep but can't because of hormonal hot flashes, night sweats and chills. Add to that the women who can't sleep because of aches and pains, sore muscles and stress and you've got a lot of women starting their days on the proverbial wrong side of the bed. Now, thanks to science and Mother Nature, there's a non-prescription, non-hormonal way for women to get a good...

2010-02-02 09:51:42

First direct observation of exchange process in quantum gas Considerable progresses made in controlling quantum gases open up a new avenue to study chemical processes. Rudolf Grimm's research team has now succeeded in directly observing chemical exchange processes in an ultracold sample of cesium atoms and Feshbach molecules. They report on their findings in the journal Physical Review Letters. Complex processes, which to a large extent cannot be observed directly, determine when chemical...

2009-12-29 08:49:40

Research gives new perspective on periodic table Transforming lead into gold is an impossible feat, but a similar type of "alchemy" is not only possible, but cost-effective too. Three Penn State researchers have shown that certain combinations of elemental atoms have electronic signatures that mimic the electronic signatures of other elements. According to the team's leader A. Welford Castleman Jr., Eberly Distinguished Chair in Science and Evan Pugh Professor in the Departments of Chemistry...

2009-12-11 12:53:48

Study of ultracold atoms proves theory about universal quantum mechanism Using atoms at temperatures colder than deep space, Rice University physicists have delivered overwhelming proof for a once-scoffed-at theory that's become a hotbed for research some 40 years after it first appeared. In a paper available online in Science Express, Rice's team offers experimental evidence for a universal quantum mechanism that allows trios of particles to appear and reappear at higher energy levels in an...

2009-12-08 08:26:04

Physicists face the daunting task of developing new, reliable ways of measuring extreme low temperatures As physicists strive to cool atoms down to ever more frigid temperatures, they face the daunting task of developing new, reliable ways of measuring these extreme lows. Now a team of physicists has devised a thermometer that can potentially measure temperatures as low as tens of trillionths of a degree above absolute zero. Their experiment is reported in the current issue of Physical Review...

2009-11-04 14:55:36

Research creates a readout system for quantum simulation and computation Physicists at Harvard University have created a quantum gas microscope that can be used to observe single atoms at temperatures so low the particles follow the rules of quantum mechanics, behaving in bizarre ways. The work, published this week in the journal Nature, represents the first time scientists have detected single atoms in a crystalline structure made solely of light, called a Bose Hubbard optical lattice. It's...

Latest Atomic physics Reference Libraries

2013-03-16 00:00:00

Niels Henrik David Bohr (October 7, 1885 - November 18, 1962) was a Danish physicist. He made essential contributions to understanding atom structure and quantum mechanics. Born in Copenhagen, Denmark to Christian Bohr and Ellen Adler, Bohr got his doctorate at Copenhagen University in 1911. He then studied under Ernest Rutherford in Manchester, England. Based on Rutherford's theories, Bohr published his Bohr model about atom structure in 1913, introducing the theory of electrons...

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Word of the Day
  • A spider.
  • Figuratively, a peevish, testy, ill-natured person.
'Attercop' comes from the Old English 'atorcoppe,' where 'atter' means 'poison, venom' and‎ 'cop' means 'spider.' 'Coppa' is a derivative of 'cop,' top, summit, round head, or 'copp,' cup, vessel, which refers to 'the supposed venomous properties of spiders,' says the OED. 'Copp' is still found in the word 'cobweb.'