5,321 research outputs found
Slow, Continuous Beams of Large Gas Phase Molecules
Cold, continuous, high flux beams of benzonitrile, fluorobenzine, and anisole
have been created. Buffer-gas cooling with a cryogenic gas provides the cooling
and slow forward beam velocities. The beam of benzonitrile was measured to have
a forward velocity peaked at 67 m s, and a continuous flux of
molecules s. These beams provide a continuous source for high
resolution spectroscopy, and provide an attractive starting point for further
spatial manipulation of such molecules, including eventual trapping
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Cooling and Collisions of Large Gas Phase Molecules
Cold and dense samples of naphthalene are produced using buffer gas cooling in combination with rapid, high flow molecule injection. The observed naphthalene density is over a volume of a few at a temperature of 6 K. We observe naphthalene–naphthalene collisions through two-body loss of naphthalene with a loss cross section of . Analysis is presented that indicates that this combination of techniques will be applicable to many comparably sized molecules. This technique can also be combined with cryogenic beam methods to produce cold, high flux, continuous molecular beams.Physic
The evolutionary development of high specific impulse electric thruster technology
Electric propulsion flight and technology demonstrations conducted primarily by Europe, Japan, China, the U.S., and the USSR are reviewed. Evolutionary mission applications for high specific impulse electric thruster systems are discussed, and the status of arcjet, ion, and magnetoplasmadynamic thrusters and associated power processor technologies are summarized
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Cold, Optically Dense Samples of Atomic Rubidium
Cold and optically dense gases of atomic rubidium are produced using buffer gas cooling in combination with rapid, high-flow vapor injection. The observed rubidium density is 3 × 10cm at a gas temperature of ∼20 K, leading to an optical density of the order of 200.Physic
Reviews
The following publications have been reviewed by the mentioned authors;CDT - Projects and Approaches by David Barlex and Richard Kimbell, reviewed by M. PattersonControl Technology (second edition) by Hodder & Stoughton, reviewed by John CaveGraphic Handbook. An Introduction to design and printing for the non-specialist by Richard McCann, reviewed by Lesley LordEngineering Technology by Liam Hennessy and Lawrence Smyth, reviewed by Stan ShawJoin in and Spin by Thames Valley, reviewed by Dorothea KaySchooling for the Dole: The New Vocationalism by Inge Bates, John Clark, Philip Cohen, Dan Finn, Robert Moore and Paul Willis, reviewed by John EgglestonGirls into Science and Technology by Judith Whyte, reviewed by John Egglesto
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