High resolution X-ray spectroscopy investigations of fs laser irradiated Ar clusters by varying cluster size and laser flux density

2001 ◽  
Vol 71 (2-6) ◽  
pp. 417-430 ◽  
Author(s):  
G.C. Junkel-Vives ◽  
J. Abdallah ◽  
F. Blasco ◽  
C. Stenz ◽  
F. Salin ◽  
...  
2001 ◽  
Vol 64 (2) ◽  
Author(s):  
G. C. Junkel-Vives ◽  
J. Abdallah ◽  
F. Blasco ◽  
C. Stenz ◽  
F. Salin ◽  
...  

2005 ◽  
pp. 47-56 ◽  
Author(s):  
M.D. Filipovic ◽  
J.L. Payne ◽  
P.A. Jones

We present a high-resolution radio-continuum study of Galactic supernova remnant MSH11-61A. We combine moderate resolution X-ray, radio-continuum and CO data to study the morphology and kinematics of MSH 11-61A. We estimate the radio-continuum spectral index to be ?843?4850=- 0.33?0.07 based on our flux density measurements and also note that this SNR has significant 'turn?over' spectra at lower (29.9843 MHz) frequencies. The diameter of MSH1161A is estimated to be 12.5' with 'ear' extensions of 41 to the northwest and southeast. The striking anticorrelation between X-ray and radio-continuum images confirms a mixed-morphology classification of this remnant. The CO images are consistent with a distance reported by Rosado et al.(1996) of about 7 kpc. .


1992 ◽  
Vol 19 (3) ◽  
pp. 189-194 ◽  
Author(s):  
P Audebert ◽  
J. P Geindre ◽  
J. C Gauthier ◽  
A Mysyrowicz ◽  
J. P Chambaret ◽  
...  
Keyword(s):  
X Ray ◽  

Author(s):  
Robert A. Grant ◽  
Laura L. Degn ◽  
Wah Chiu ◽  
John Robinson

Proteolytic digestion of the immunoglobulin IgG with papain cleaves the molecule into an antigen binding fragment, Fab, and a compliment binding fragment, Fc. Structures of intact immunoglobulin, Fab and Fc from various sources have been solved by X-ray crystallography. Rabbit Fc can be crystallized as thin platelets suitable for high resolution electron microscopy. The structure of rabbit Fc can be expected to be similar to the known structure of human Fc, making it an ideal specimen for comparing the X-ray and electron crystallographic techniques and for the application of the molecular replacement technique to electron crystallography. Thin protein crystals embedded in ice diffract to high resolution. A low resolution image of a frozen, hydrated crystal can be expected to have a better contrast than a glucose embedded crystal due to the larger density difference between protein and ice compared to protein and glucose. For these reasons we are using an ice embedding technique to prepare the rabbit Fc crystals for molecular structure analysis by electron microscopy.


Author(s):  
G. Van Tendeloo ◽  
J. Van Landuyt ◽  
S. Amelinckx

Polytypism has been studied for a number of years and a wide variety of stacking sequences has been detected and analysed. SiC is the prototype material in this respect; see e.g. Electron microscopy under high resolution conditions when combined with x-ray measurements is a very powerful technique to elucidate the correct stacking sequence or to study polytype transformations and deviations from the ideal stacking sequence.


Author(s):  
R. Gronsky

The phenomenon of clustering in Al-Ag alloys has been extensively studied since the early work of Guinierl, wherein the pre-precipitation state was characterized as an assembly of spherical, ordered, silver-rich G.P. zones. Subsequent x-ray and TEM investigations yielded results in general agreement with this model. However, serious discrepancies were later revealed by the detailed x-ray diffraction - based computer simulations of Gragg and Cohen, i.e., the silver-rich clusters were instead octahedral in shape and fully disordered, atleast below 170°C. The object of the present investigation is to examine directly the structural characteristics of G.P. zones in Al-Ag by high resolution transmission electron microscopy.


Author(s):  
Yun Lu ◽  
David C. Joy

High resolution scanning electron microscopy (SEM) and energy dispersive x-ray analysis (EDXA) were performed to investigate microparticles in blended cements and their hydration products containing sodium-rich chemical wastes. The physical appearance of powder particles and the morphological development at different hydration stages were characterized by using high resolution SEM Hitachi S-900 and by SEM S-800 with a EDX spectrometer. Microparticles were dispersed on the sample holder and glued by 1% palomino solution. Hydrated bulk samples were dehydrated by acetone and mounted on the holder by silver paste. Both fracture surfaces and flat cutting sections of hydrating samples were prepared and examined. Some specimens were coated with an 3 nm thick Au-Pd or Cr layer to provide good conducting surfaces. For high resolution SEM S-900 observations the accelerating voltage of electrons was 1-2 KeV to protect the electron charging. Microchemical analyses were carried out by S800/EDS equipped with a LINK detector of take-off angle =40°.


Sign in / Sign up

Export Citation Format

Share Document