Recent developments in molecular ion recombination research

1990 ◽  
Author(s):  
J. B. A. Mitchell
Keyword(s):  
Molecular Ion ◽  
Recent Developments ◽  
Ion Recombination

Electron molecular ion recombination: Product excitation and fragmentation

2006 ◽  
Vol 25 (5) ◽  
pp. 798-828 ◽  
Author(s):  
Nigel G. Adams ◽  
Viktoriya Poterya ◽  
Lucia M. Babcock
Keyword(s):  
Molecular Ion ◽  
Recombination Product ◽  
Ion Recombination

scholarly journals The Cryogenic Storage Ring and its application to molecular ion recombination physics

2011 ◽  
Vol 300 ◽  
pp. 012010 ◽  
Author(s):  
C Krantz ◽  
F Berg ◽  
K Blaum ◽  
F Fellenberger ◽  
M Froese ◽  
...  
Keyword(s):  
Storage Ring ◽  
Cryogenic Storage ◽  
Molecular Ion ◽  
Ion Recombination

Photo-Detachment of H- in Magnetized Cascaded Arc Hydrogen Plasma

2011 ◽  
Vol 227 ◽  
pp. 208-210
Author(s):  
Suleiman M. Elhamali ◽  
A. Bouzed ◽  
Anwar M. Hashkel
Keyword(s):  
Population Inversion ◽  
Hydrogen Plasma ◽  
Yag Laser ◽  
Molecular Ion ◽  
Blue Region ◽  
Ion Recombination

In the blue region of the magnetized hydrogen plasma the population inversion has been observed. Possible reaction responsible for the inversion is molecular ion recombination that gives an overpopulation of states 4, 5 and 6. This inversion can be eliminated by using Nd: YAG laser, λ=1064 nm (1.15 eV) to photo-detach H- (0.75 eV). Approximately 60% of Hα and less than 10% of Hβ have been destroyed.

Recent Merged Beams Investigations of Hydrogen Molecular Ion Recombination

1993 ◽  
pp. 87-97 ◽  
Author(s):  
J. B. A. Mitchell ◽  
F. B. Yousif ◽  
P. Van der Donk ◽  
T. J. Morgan
Keyword(s):  
Hydrogen Molecular Ion ◽  
Molecular Ion ◽  
Ion Recombination

Trends in Electron Energy Loss Spectroscopy

1977 ◽  
Vol 35 ◽  
pp. 228-229
Author(s):  
C. Colliex ◽  
P. Trebbia
Keyword(s):  
Energy Loss ◽  
Electron Energy ◽  
Electron Energy Loss Spectroscopy ◽  
Materials Science ◽  
Analytical Technique ◽  
Recent Developments ◽  
Quantitative Results ◽  
Electron Microscopes ◽  
Electron Energy Loss ◽  
Primary Electrons

The physical foundations for the use of electron energy loss spectroscopy towards analytical purposes, seem now rather well established and have been extensively discussed through recent publications. In this brief review we intend only to mention most recent developments in this field, which became available to our knowledge. We derive also some lines of discussion to define more clearly the limits of this analytical technique in materials science problems.The spectral information carried in both low ( 0<ΔE<100eV ) and high ( >100eV ) energy regions of the loss spectrum, is capable to provide quantitative results. Spectrometers have therefore been designed to work with all kinds of electron microscopes and to cover large energy ranges for the detection of inelastically scattered electrons (for instance the L-edge of molybdenum at 2500eV has been measured by van Zuylen with primary electrons of 80 kV). It is rather easy to fix a post-specimen magnetic optics on a STEM, but Crewe has recently underlined that great care should be devoted to optimize the collecting power and the energy resolution of the whole system.

Filaments and membranes in the mitotic apparatus

1983 ◽  
Vol 41 ◽  
pp. 544-547
Author(s):  
Kent McDonald
Keyword(s):  
Intermediate Filaments ◽  
Mitotic Spindle ◽  
Mitotic Apparatus ◽  
Light Microscope Level ◽  
Microtubule Associated Proteins ◽  
Recent Developments ◽  
Associated Proteins ◽  
Force Generator ◽  
Spindle Function ◽  
Antibody Technology

At the light microscope level the recent developments and interest in antibody technology have permitted the localization of certain non-microtubule proteins within the mitotic spindle, e.g., calmodulin, actin, intermediate filaments, protein kinases and various microtubule associated proteins. Also, the use of fluorescent probes like chlorotetracycline suggest the presence of membranes in the spindle. Localization of non-microtubule structures in the spindle at the EM level has been less rewarding. Some mitosis researchers, e.g., Rarer, have maintained that actin is involved in mitosis movements though the bulk of evidence argues against this interpretation. Others suggest that a microtrabecular network such as found in chromatophore granule movement might be a possible force generator but there is little evidence for or against this view. At the level of regulation of spindle function, Harris and more recently Hepler have argued for the importance of studying spindle membranes. Hepler also believes that membranes might play a structural or mechanical role in moving chromosomes.

Software pattern recognition applied to nanodiffraction patterns from a STEM instrument

1986 ◽  
Vol 44 ◽  
pp. 694-695
Author(s):  
G.Y. Fan ◽  
J.M. Cowley
Keyword(s):  
Image Processing ◽  
Pattern Recognition ◽  
Computer Software ◽  
Processing System ◽  
Light Level ◽  
Host Computer ◽  
Low Light ◽  
Image Processing System ◽  
Recent Developments ◽  
On Line

In recent developments, the ASU HB5 has been modified so that the timing, positioning, and scanning of the finely focused electron probe can be entirely controlled by a host computer. This made the asynchronized handshake possible between the HB5 STEM and the image processing system which consists of host computer (PDP 11/34), DeAnza image processor (IP 5000) which is interfaced with a low-light level TV camera, array processor (AP 400) and various peripheral devices. This greatly facilitates the pattern recognition technique initiated by Monosmith and Cowley. Software called NANHB5 is under development which, instead of employing a set of photo-diodes to detect strong spots on a TV screen, uses various software techniques including on-line fast Fourier transform (FFT) to recognize patterns of greater complexity, taking advantage of the sophistication of our image processing system and the flexibility of computer software.

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