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Topic: Atomic Pulse

In the News (Thu 31 Dec 09)

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Hugh Jackman

	oe magazine - Pulsed Lasers Speed Up (Site not responding. Last check: 2007-10-16)
		Pulses having the same C-E phase, and hence the same waveform, are selected from the 80-MHz train at a 1-kHz repetition rate and amplified in a Ti:sapphire multipass, chirped-pulse amplifier system to a pulse energy of about 1 mJ.
		The reproducible generation of single sub-femtosecond pulses was not possible until 2003, when researchers created a method to precisely control the giant atomic dipole oscillations with intense waveform-controlled, few-cycle laser pulses.
		Although the intensity of the 5-fs pulse leads to x-ray emission, the use of waveform-controlled light excites the atomic oscillations in a manner that is precisely reproducible from one laser shot to the next.
	oemagazine.com /fromTheMagazine/may04/pulsed.html (2441 words)

	Gain-assisted superluminal light propagation (Site not responding. Last check: 2007-10-16)
		The observed superluminal light pulse propagation is not at odds with causality, being a direct consequence of classical interference between its different frequency components in an anomalous dispersion region.
		A portion of the pulsed probe beam is divided at a beam-splitter before the atomic cell and aligned onto photodiode D1 as a reference.
		The pulses measured with detector D1 are also recorded in the sequence of the off-, on-, off-resonance pulse-propagation measurements and are found to be identical to within 1.5 ns.
	www.nature.com /cgi-taf/DynaPage.taf?file=/nature/journal/v406/n6793/full/406277a0_r.html (2577 words)

	CHP - Atomic Emission Spectroscopy (Site not responding. Last check: 2007-10-16)
		Atomic emission spectroscopy (AES or OES [optical emission spectroscopy]) uses quantitative measurement of the optical emission from excited atoms to determine analyte concentration.
		Since the transitions are between distinct atomic energy levels, the emission lines in the spectra are narrow.
		Since the atomic emission lines are very narrow, a high-resolution polychromator is needed to selectively monitor each emission line.
	www.chem.vt.edu /chem-ed/spec/atomic/aes.html (279 words)

	Femtosecond to Attosecond science (Site not responding. Last check: 2007-10-16)
		An optimized laser pulse results in a series of x-ray bursts from an atom that are all in phase, thus enhancing the x-ray output.
		By manipulating a light pulse on the fastest possible time-scale relevant to atomic and molecular processes—that corresponding to less than a single undulation of the electromagnetic field of the light—we have manipulated atomic and molecular quantum wave functions in a demonstrably useful way.
		In general, if the laser pulse is not carefully-shaped, the x-ray bursts from adjacent cycles of the laser pulse will not necessarily add completely in phase, leading to a partial destructive interference that limits the intensity of the x-ray emission.
	jilawww.colorado.edu /~rachael/research/Femtosecond.htm (846 words)

	Pulsed NMR Spectrometer from TEL-Atomic
		Hahn’s pulse spectroscopy idea matured in the 1960’s when technology allowed Anderson and Ernst the use of computers for Fourier Transformations (for his contribution to modern NMR Ernst received the Nobel Prize in 1991).
		Advanced experiments such as multiple pulse sequences and rotating frames of reference, as well as, angle dependence on spectra shape lets the student explore more deeply into the uses of NMR.
		Second pulse is twice as long as first one is. For a brief generation of Hahn’s spin-echo.
	www.telatomic.com /nmr.html (1666 words)

	Physics News Update
		Since the front edge of the signal pulse enters the cell (and hence is decelerated) first, the pulse experiences dramatic spatial compression: from several kilometers in free-space to a few centimeters inside the rubidium vapor.
		Next, the Harvard-Smithsonian scientists stop the signal pulse of light by gradually turning off the control beam, which causes more atoms to be mixed with fewer photons, thereby increasing the polariton mass and further reducing the signal pulse's speed.
		Thus, the information that the light pulse carried (all that one can know about the photons) is stored in the atomic spin wave, waiting to be released as a light pulse that is in principle identical to the incident pulse.
	www.aip.org /pnu/2001/split/521-1.html (1053 words)

	Atomic species identification in Scanning Tunneling Microscopy by Time-of-Flight spectroscopy (Site not responding. Last check: 2007-10-16)
		where t is the flight time, m the atomic mass, n the ionic charge and L = 200mm (figure 1) on the assumption that the ions are accelerated to their final velocity within a few microns of the tip, due to the rapid falloff in potential near the tip.
		The mass resolution of the TOF spectrometer is influenced by several factors including the variation in time between axial and marginal rays (2% error) and the shape of the evaporation pulse (ions leaving the tip at the beginning of the pulse are accelerated for longer than those emitted near the end).
		After pulsing, the right hand image was obtained in a second scan (with the transferred material still on the tip).
	www.public.asu.edu /~weier/sap/sap.j.vac.sci.html (2133 words)

	Glossary [Thermal Energy to Yield] \| atomicarchive.com
		A measure of the energy released in the detonation of a nuclear (or atomic) weapon, or in the explosion of a given quantity of fissionable material, expressed in terms of the mass of TNT which would release the same amount of energy when exploded.
		Electromagnetic radiation emitted (in two pulses from an air burst) from the fireball as a consequence of its very high temperature; it consists essentially of ultraviolet, visible, and infrared radiations.
		In the early stages (first pulse of an air burst), when the temperature of the fireball is very high, the ultraviolet predominates; in the second pulse, the temperatures are lower and most of it is in the visible and infrared regions of the spectrum.
	www.atomicarchive.com /Glossary/Glossary10.shtml (1361 words)

	Atomic Physics: Steven Chu Group at Stanford University
		The use of ultra-cold atoms, atomic fountains and hyperfine ground states allow interrogation time of up to 1 second thereby improving the precision of such measurements by orders of magnitude.
		The combination of cold atoms in an atomic fountain and the use of an active vibration isolation system with an effective resonance frequency of 1/100 Hz allow us to achieve a long time between the interferometer pulses.
		Appropriate time between the pulses allows the huge phase shift due to g to cancel in different loops resulting in the measurement of the minute differences of g in these loops due to gradient.
	www.stanford.edu /group/chugroup/amo/interferometry.html (1100 words)

	The art of taming light: ultra-slow and stopped light
		While the pulse is in the atom cloud, its group velocity and spatial extent are both proportional to the intensity of the coupling field and inversely proportional to the atom density.
		The observed boomerang shape of the light pulse (at 5 µs) reflects that the light speed along the centreline of the condensate is significantly lower than at the edges due to the high atom density in the middle of the cloud.
		The pulse delay is 12 µs, and the arrow indicates the point in time when the light pulse is slowed, compressed, and totally contained in the middle of the atom cloud.
	www.europhysicsnews.com /full/26/article1/article1.html (6866 words)

	Atomic Pulse - Wikipedia, the free encyclopedia
		Atomic Pulse are Tamir Ozana and Yair Bar-On, a psychedelic trance project from Israel.
		"Direct Source" is Atomic Pulse 3rd Album, released in March 2006 On B.N.E Records.
		Atomic Pulse is set for an upcoming 2006 worldwide tour Including: Germany, U.K, Spain, Japan, Morocco, Greece, Holland, Portugal, Swiss, U.S.A, Denmark, Brazil, Mexico, Argentina, Serbia, Austria, Australia and many more.
	en.wikipedia.org /wiki/Atomic_Pulse (683 words)

	Physics News Update
		In that work the propagation of light pulses was halted by vesting the properties of incoming photons into the spin orientations of the atoms in the vapor.
		Thus light pulses had been stopped by ceasing to exist in the form of electromagnetic energy while ceding all of its signal qualities to the atomic vapor.
		In this hall of atomic mirrors, the original pulse still exists as electromagnetic radiation, but it cannot move---it persists within a fixed stationary envelope.
	www.aip.org /enews/physnews/2003/split/665-1.html (424 words)

	BNE Release
		"Atomic Pulse", (Tamir Ozana and Yair Bar-On) is one of the most popular acts to emerge from the Israeli trance scene in the last few years.
		Atomic Pulse’s first album was originally released in December 2002 (“The Safi Collection”) and was well received the 2nd album “De-Toxciated” was released in May 2004, and was the turning point in their sound concept.
		This is Atomic Pulse’s music at its best so plug yourself in – Direct Source will burn your ears...
	www.chromanova.de /html_radionews/html_bne/Atomic_Pulse_Direct_Source.html (246 words)

	Physics Today March 2001
		The secret is to couple the light to an atomic system--in this case, a dense gas of three-level atoms--and to imprint the information carried by the photons onto the atoms, specifically as a coherent pattern of atomic spins.
		Once the light pulse has been slowed and compressed within the gas, one can continue to reduce the coupling intensity without inducing absorption because the bandwidth of the pulse will continue to narrow in such a way that it always remains within the transparency window.
		While the pulse in the cold-atom experiment fit entirely within the gas cell, in the CFA experiment, the leading edge of the pulse train passed out of the cell before the coupling laser was taken to zero.
	www.aip.org /pt/vol-54/iss-3/p17.html (1606 words)

	PULSE at Stanford University
		PULSE (Photon Ultrafast Laser Science and Engineering) is based on a remarkable new venture at SLAC/Stanford — the construction of the world’s first x-ray free electron laser.
		PULSE builds on, and leverages existing strengths in, atomic physics, chemistry, biology and condensed matter physics.
		The Center will focus on ultrafast structural and electronic dynamics in materials science, the generation of attosecond laser pulses, single molecule imaging, and the origin of efficient light harvesting and solar energy conversion in molecular systems during the first three years of operation.
	www-ssrl.slac.stanford.edu /ultrafast (241 words)

	Shih-I Chu (Site not responding. Last check: 2007-10-16)
		The recent advancement of intense ultrashort laser pulse technology has led to the discovery of a number of novel high-intensity phenomena which cannot be understood and treated by means of traditional perturbation theories.
		The attosecond pulse will allow the direct exploration of the electron wave packet dynamics in chemical and biological systems in the future, leading to revolutionary advancement beyond the well-established femtosecond technology.
		Chu’s group is currently exploring the highly nonlinear interaction of attosecond laser pulse with atomic and molecular systems and the methodology for the optimal control of the attosecond pulse generation.
	www.chem.ku.edu /SChu (1009 words)

	Pulse of the Twin Cities - Locally Grown Alternative Newspaper
		A British Atomic Energy Authority study projected half a million premature deaths from the 320 tons of DU used in 1991 (findings kept secret until 1998).
		It took decades to uncover the deliberate exposure of Cold War soldiers to radiation—men known as “the Atomic Veterans.” Initially, it was believed only a “handful” of experiments occurred, but hundreds were revealed by the President’s Advisory Commission On Human Radiation Experiments in the 1990s.
		The Atomic Veterans Radiation Newsletter reported in March 2001 that the Clinton Administration continued stalling tactics by refusing to include certain cancers as part of “qualifying” radiation-exposed veterans for disability.
	www.pulsetc.com /article.php?sid=505 (2010 words)

	Session QP1 - Poster Session.
		An ultrashort electromagnetic wave pulse is expected to be used for the excitation of large amplitude wavefield and the diagnostic of temporal evolution in the plasma wave phenomena.
		The observed pulse width is 5 ns for the waveguide length of 2 m.
		The laser pulse’s energy decreases as the wake is generated while the number of photons, or equivalently, the classical action of the electromagnetic wave is conserved.
	flux.aps.org /meetings/YR99/DPP99/abs/S655.html (18048 words)

	What's New at the CfA (Site not responding. Last check: 2007-10-16)
		Sending a light pulse into specially prepared rubidium (Rb) vapor, a group at the Harvard-Smithsonian Center for Astrophysics led by Ron Walsworth and Mikhail Lukin has (1) slowed the pulse's "group velocity" to zero and (2) stored its information in the form of an atomic "spin wave," a collective excitation in the Rb atoms.
		Since the front edge of the signal pulse enters the cell (and hence is decelerated) first, the pulse experiences dramatic spatial compression: from severalkilometers in free-space to a few centimeters inside the rubidium vapor.
		The light-atom interaction causes the polaritons to act as if they have an effective mass; so one way to understand the signal pulse's reduced speed is that the mixture with atoms, in the form of a polariton, effectively weighs down the otherwise massless photons.
	cfa-www.harvard.edu /newtop/previous/020201.html (1079 words)

	COMICON.com: FREE COMIC BOOK DAY 2.5?
		I can honestly say that Atomic Comics has done nothing but offer not only all of the FCBD books offered to us, but have never used it as a way of unloading "Damage Control".
		Atomic Comics doesn't have to participate in any FCBD event, and when they do, that's a plus for both the comics industry and for the fans.
		Every business has its ups and downs and due to some of the latter we've recently moved our club from Atomic to Samurai Comics, but Atomic was always helpful with the club and helping to promote comics to new people.
	www.comicon.com /cgi-bin/ultimatebb.cgi?ubb=get_topic&f=36&t=001387 (2976 words)

	Atomic Pulse - Direct Source - BNE Virtual Shop
		Atomic Pulse - Direct Source - Fatality [mp3] @ $0.99
		Atomic Pulse - Direct Source - Noise Freak [mp3] @ $0.99
		Atomic Pulse - Direct Source - Kuromatic [mp3] @ $0.99
	shop.bne.co.il /product_info.php?products_id=537 (423 words)

	Microscope features laser pulse mode., Imago Scientific Instruments Corporation
		Voltage pulse mode applications of Imago's LEAP 3000 Microscope include precipitate composition and distribution, phase/grain boundary analysis, nuclear materials, thin metal films, and interface engineering (diffusion and roughness).
		The laser pulse mode of the 3000X is a separate module.
		A LEAP 3000X system may be ordered from the factory configured with voltage pulse mode or both voltage and laser pulse mode.
	news.thomasnet.com /fullstory/469059/rss/1782 (794 words)

	Australian National University EPrints2 Archive - The atomic waveplate (Site not responding. Last check: 2007-10-16)
		A further numerical model, within the mean field approximation, is performed for an atomic pulse from an atom laser passing through the resonance.
		The extra coupling between states introduced by the spatial extent of the pulse causes a spread in the momentum of trapped and anti-trapped states that atoms are coupled into within the resonance.
		An experimental setup for the manipulation of the atomic spin states with an RF field is investigated and designed.
	eprints.anu.edu.au /archive/00002361 (214 words)

	fUSION Anomaly. Pulses
		Pulse, rhythmic expansion of the arteries caused by successive surges of blood produced by contractions of the heart.
		The pulse may be felt wherever an artery passes over a solid structure, such as a bone or cartilage, and it is commonly taken at the wrist.
		The pulse rate varies from 150 beats per minute in an embryo to about 60 in the aged.
	fusionanomaly.net /pulses.html (1214 words)

	output power of pulse-lasers
		For pulse lasers, thers are two parameters describing its output power.
		But there is a direct relationship, the area of the pulse is directly proportional to the average power so if you are careful it should not matter.
		Class IV: High power lasers (cw: 500 mW, pulsed: 10 J/cm2 or the diffuse reflection limit) are hazardous to view under any condition (directly or diffusely scattered) and are a potential fire hazard and a skin hazard.
	www.physicsforums.com /showthread.php?p=1010106#post1010106 (763 words)

	Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations
		The spectroscopy termed 2PACC (two-pulse atomic coherent control) employs the coherent properties of matter waves from a two-pulse atom laser.
		The method is demonstrated for an Eley-Rideal reaction of a hydrogen or alkali atom-laser pulse where the surface target is an adsorbed hydrogen atom.
		The desorbed gas-phase molecular yield and its internal state is shown to be controlled by the time and phase delay between two atom-laser pulses.
	www.osti.gov /energycitations/product.biblio.jsp?osti_id=20443560 (301 words)

	Physics News 521, January 18, 2001
		The light storage experiment begins with the Harvard- Smithsonian scientists shining a "control" laser beam into a glass cell filled with rubidium vapor (about 70-90 degrees Celsius), which puts the atoms into a conventional EIT state in which they cannot absorb light in the traditional sense.
		The light in the vapor cell interacts with the atoms (see figure at http://www.aip.org/physnews/graphics), changing the atoms' spin states coherently and creating a joint atom-photon system known as a polariton.
		In addition, an upcoming theory paper (Kocharavskaya et al., Phys Rev. Lett., 22 January) discusses a novel technique for making a light beam not only stop in its tracks but reverse its direction; this effect could be useful for non-linear optics applications.
	newton.ex.ac.uk /aip/physnews.521.html (986 words)

	Atomic Mount - Heart Rate Monitor Mount
		The elegant, unique patent pending design provides an easy to use mount that lets you place your heart rate monitor in the center of your vision - on your stem and out of the way of your hands.
		Atomic Mount works with any watch-style heart rate monitor.
		Atomic Mount is a registered trademark of Atomic Mount.
	www.atomicmount.com /solutions.htm (288 words)

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