Pulsed Optical Pumping in Low-Pressure Mercury Discharges

1986 ◽  
pp. 65-93 ◽  
Author(s):  
P. van de Weijer ◽  
R. M. M. Cremers
Keyword(s):  
Optical Pumping ◽  
Low Pressure

An Experiment to Compress Polarized 3He Gas

1971 ◽  
Vol 49 (5) ◽  
pp. 508-516 ◽  
Author(s):  
R. S. Timsit ◽  
J. M. Daniels ◽  
E. I. Dennig ◽  
A. K. C. Kiang ◽  
A. D. May
Keyword(s):  
Optical Pumping ◽  
Low Pressure ◽  
Pressure Side ◽  
Measured Polarization ◽  
Torr Pressure ◽  
Helium 3

Helium-3, polarized by optical pumping of the 23S1 metastable atoms at 1 Torr pressure, has been compressed to a pressure of 217 Torr and it has been verified that the gas remains polarized. 3He at 1 Torr was polarized and compressed into a storage bulb using a Toepler pump, and this was repeated with successive charges of 3He until the pressure in the storage bulb rose to 217 Torr after about 4 h of operation. Some of the gas was returned to the low pressure side of the equipment and its polarization was measured. The polarization attained before each charge was compressed was 0.04; the measured polarization of the returned gas was 0.03.

Effects of Electrical Discharges in Low Pressure Gases on the Morphology of Polyethylene Crystals

1974 ◽  
Vol 32 ◽  
pp. 544-545
Author(s):  
L.H. Bolz ◽  
D.H. Reneker
Keyword(s):  
Power Distribution ◽  
Electrical Discharge ◽  
Dielectric Breakdown ◽  
Ionic Species ◽  
Low Pressure ◽  
Polymer Surfaces ◽  
Electrical Discharges ◽  
Adhesive Bonds ◽  
Power Distribution Lines ◽  
Modification Of The Surface

The attack, on the surface of a polymer, by the atomic, molecular and ionic species that are created in a low pressure electrical discharge in a gas is interesting because: 1) significant interior morphological features may be revealed, 2) dielectric breakdown of polymeric insulation on high voltage power distribution lines involves the attack on the polymer of such species created in a corona discharge, 3) adhesive bonds formed between polymer surfaces subjected to such SDecies are much stronger than bonds between untreated surfaces, 4) the chemical modification of the surface creates a reactive surface to which a thin layer of another polymer may be bonded by glow discharge polymerization.

Field ion microscopy

1988 ◽  
Vol 46 ◽  
pp. 434-435
Author(s):  
Gert Ehrlich
Keyword(s):  
Low Temperature ◽  
Sample Surface ◽  
Low Pressure ◽  
Radius Of Curvature ◽  
Field Ion Microscopy ◽  
Phosphor Screen ◽  
Ion Microscopy ◽  
Field Ion Microscope

The field ion microscope, devised by Erwin Muller in the 1950's, was the first instrument to depict the structure of surfaces in atomic detail. An FIM image of a (111) plane of tungsten (Fig.l) is typical of what can be done by this microscope: for this small plane, every atom, at a separation of 4.48Å from its neighbors in the plane, is revealed. The image of the plane is highly enlarged, as it is projected on a phosphor screen with a radius of curvature more than a million times that of the sample. Müller achieved the resolution necessary to reveal individual atoms by imaging with ions, accommodated to the object at a low temperature. The ions are created at the sample surface by ionization of an inert image gas (usually helium), present at a low pressure (< 1 mTorr). at fields on the order of 4V/Å.

Low pressure improves ink jets

Nature ◽  
2005 ◽  
Author(s):  
Philip Ball
Keyword(s):  
Low Pressure
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