Monthly Archives: March 2015

Laser-assisted XUV Double Ionization of Helium: Energy-sharing Dependence of Joint Angular Distributions

By numerically solving the time-dependent Schrodinger equation in full dimensionality, we discuss the dependance of joint photoelectron angular distributions on the energy sharing of the emitted electrons for the double ionization of helium atoms by ultrashort pulses of extreme ultraviolet … Continue reading

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Illinois University Invests in Helium Recycling

The University of Illinois has recently made considerable investment in helium recycling technology as it strives to achieve sustainability in the gas against a well-documented backdrop of fluctuating supply dynamics. Helium is a linchpin for millions of dollars of chemical … Continue reading

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Fast-rising Helium Prices May Pop Balloon Sales

In the midst of a national helium shortage, floating balloons serving as tokens of affection for Valentine’s Day can represent a precious commodity to business owners. Helium, the second most common element in the universe after hydrogen, is distilled during … Continue reading

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Lawsuit Filed Against Navy for Destroyed Experimental Airship

The makers of a state-of-the art airship have filed a $65 million lawsuit against the U.S. Navy after the helium-filled dirigible was crushed when part of the roof of the hangar where it was stored collapsed on it. The suit, … Continue reading

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Effect Of Helium Ion Beam Treatment On The Etching Rate Of Silicon Nitride

We investigated the effect of the helium ion implantation on the etching rate of silicon nitride in hydrofluoric acid. 30 keV helium ions were implanted into a 500-nm-thick silicon nitride film on silicon. Ion fluences from 1015 to 1017 cm−2 … Continue reading

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