scholarly journals HST/COS Observations of Quasar Outflows in the 500–1050 Å Rest Frame. V. Richness of Physical Diagnostics and Ionization Potential-dependent Velocity Shift in PKS J0352-0711

2020 ◽  
Vol 247 (2) ◽  
pp. 41 ◽  
Author(s):  
Timothy R. Miller ◽  
Nahum Arav ◽  
Xinfeng Xu ◽  
Gerard A. Kriss ◽  
Rachel J. Plesha
Keyword(s):  
Ionization Potential ◽  
Rest Frame ◽  
Velocity Shift ◽  
Physical Diagnostics

scholarly journals Velocity shift of Mg ii and Al iii broad absorption lines in quasar SDSS J134444.33+315007.6

2020 ◽  
Vol 499 (1) ◽  
pp. L58-L61
Author(s):  
Wei-Jian Lu ◽  
Ying-Ru Lin
Keyword(s):  
Rest Frame ◽  
Background Radiation ◽  
Radiation Energy ◽  
Absorption Lines ◽  
Broad Absorption ◽  
Velocity Shift ◽  
System A ◽  
Variation Characteristics ◽  
Broad Absorption Lines ◽  
First Time

ABSTRACT We report, for the first time, a synchronized velocity shift of Mg ii and Al iii broad absorption lines (BALs) in quasar SDSS J134444.33+315007.6 (hereafter, J1344+3150). We found this quasar from a sample of 134 Mg ii BAL quasars with multi-epoch observations. This quasar contains three low-ionization BAL systems, the fastest of which at ${\sim} -17\, 000\, \rm km\, s^{-1}$ shows a kinematic shift of ${\sim} -1101$ and $\sim -1170\, \rm km\, s^{-1}$ in its Mg ii and Al iii ions, respectively, during a rest-frame time of about 3.21 yr. Meanwhile, this quasar also shows other various variation characteristics, including an obvious weakening in its continuum, a coordinated enhancement in multiple emission lines (Mg ii, C iii, and Al iii), and a coordinated enhancement in three Al iii absorption troughs. These variation characteristics convincingly indicate that the BAL outflows of J1344+3150 are under the influence from the background radiation energy. Thus, we infer that the velocity shift displayed in system A in the quasar J1344+3150 may indicate an actual line-of-sight acceleration of an outflow due to the radiation pressure from the central source.

An Attack on the Contamination Problem in the Electron Microscope

1967 ◽  
Vol 25 ◽  
pp. 368-368
Author(s):  
J. J. Kelsch ◽  
A. Holtz
Keyword(s):  
Electron Microscope ◽  
Pressure Gradient ◽  
Ionization Potential ◽  
Simple Solution ◽  
Specimen Surface ◽  
Contamination Rate ◽  
Local Pressure ◽  
High Ionization ◽  
Hydrocarbon Molecules ◽  
Contamination Problem

A simple solution to the serious problem of specimen contamination in the electron microscope is presented. This is accomplished by the introduction of clean helium into the vacuum exactly at the specimen position. The local pressure gradient thus established inhibits the migration of hydrocarbon molecules to the specimen surface. The high ionization potential of He permits the use of relatively large volumes of the gas, without interfering with gun stability. The contamination rate is reduced on metal samples by a factor of 10.

Density-driven ionization potential depression and its effects on material properties

2019 ◽  
Author(s):  
A Jenei ◽  
S Jiang ◽  
Y Ping ◽  
M Gorman ◽  
S Elatresh ◽  
...  
Keyword(s):  
Ionization Potential ◽  
Material Properties

Measurements of the Rydberg Transition Energies for the n1S0 State and the Ionization Potential for 40Ca Atoms

JETP Letters ◽  
2019 ◽  
Vol 110 (12) ◽  
pp. 761-765
Author(s):  
B. B. Zelener ◽  
S. A. Saakyan ◽  
V. A. Sautenkov ◽  
E. V. Vilshanskaya ◽  
B. V. Zelener ◽  
...  
Keyword(s):  
Ionization Potential ◽  
Transition Energies ◽  
Rydberg Transition
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