scholarly journals Steady-State Asymmetric Nanospray Dual Ion Source for Accurate Mass Determination within a Chromatographic Separation

2007 ◽  
Vol 79 (15) ◽  
pp. 5711-5718 ◽  
Author(s):  
Nicolas L. Young ◽  
Michael C. Sisto ◽  
Meggie N. Young ◽  
Patrick G. Grant ◽  
David W. Killilea ◽  
...  
Keyword(s):  
Steady State ◽  
Chromatographic Separation ◽  
Ion Source ◽  
Accurate Mass ◽  
Mass Determination

High‐intensity H− ion source with steady‐state plasma injection

1986 ◽  
Vol 57 (5) ◽  
pp. 827-830 ◽  
Author(s):  
A. I. Hershcovitch ◽  
V. J. Kovarik ◽  
K. Prelec
Keyword(s):  
Steady State ◽  
High Intensity ◽  
Ion Source ◽  
Plasma Injection ◽  
State Plasma

scholarly journals The emission properties, structure and stability of ionic liquid menisci undergoing electrically assisted ion evaporation

2022 ◽  
Vol 933 ◽  
Author(s):  
Ximo Gallud ◽  
Paulo C. Lozano
Keyword(s):  
Ionic Liquid ◽  
Steady State ◽  
Ion Source ◽  
Emission Region ◽  
Tension Stress ◽  
Liquid Temperature ◽  
Axially Symmetric ◽  
Current Output ◽  
Hydraulic Impedance ◽  
Ion Evaporation

The properties and structure of electrically stressed ionic liquid menisci experiencing ion evaporation are simulated using an electrohydrodynamic model with field-enhanced thermionic emission in steady state for an axially symmetric geometry. Solutions are explored as a function of the external background field, meniscus dimension, hydraulic impedance and liquid temperature. Statically stable solutions for emitting menisci are found to be constrained to a set of conditions: a minimum hydraulic impedance, a maximum current output and a narrow range of background fields that maximizes at menisci sizes of 0.5–3 ${\rm \mu}{\rm m}$ in radius. Static stability is lost when the electric field adjacent to the electrode that holds the meniscus corresponds to an electric pressure that exceeds twice the surface tension stress of a sphere of the same size as the meniscus. Preliminary investigations suggest this limit to be universal, therefore, independent of most ionic liquid properties, reservoir pressure, hydraulic impedance or temperature and could explain the experimentally observed bifurcation of a steady ion source into two or more emission sites. Ohmic heating near the emission region increases the liquid temperature, which is found to be important to accurately describe stability boundaries. Temperature increase does not affect the current output when the hydraulic impedance is constant. This phenomenon is thought to be due to an improved interface charge relaxation enhanced by the higher electrical conductivity. Dissipated ohmic energy is mostly conducted to the electrode wall. The higher thermal diffusivity of the wall versus the liquid, allows the ion source to run in steady state without heating.

Steady-state operation of a large-area high-power RF ion source for the neutral beam injector

2014 ◽  
Vol 65 (8) ◽  
pp. 1273-1276 ◽  
Author(s):  
Doo-Hee Chang ◽  
Min Park ◽  
Seung Ho Jeong ◽  
Tae-Seong Kim ◽  
Kwang Won Lee ◽  
...  
Keyword(s):  
Steady State ◽  
High Power ◽  
Ion Source ◽  
Neutral Beam ◽  
Large Area ◽  
Neutral Beam Injector ◽  
Steady State Operation ◽  
Rf Ion Source

Accurate Mass Determination of Neutron-Deficient Nuclides Close to Z = 82 with ISOLTRAP

2001 ◽  
pp. 337-340 ◽  
Author(s):  
S. Schwarz ◽  
F. Ames ◽  
G. Audi ◽  
D. Beck ◽  
G. Bollen ◽  
...  
Keyword(s):  
Accurate Mass ◽  
Mass Determination

scholarly journals A Survey of Stellar Families: Multiplicity Among Solar-type Stars

2006 ◽  
Vol 2 (S240) ◽  
pp. 254-257
Author(s):  
Deepak Raghavan ◽  
H. A. McAlister ◽  
T. J. Henry ◽  
B. D. Mason
Keyword(s):  
Survey Methods ◽  
Sample Survey ◽  
Accurate Mass ◽  
Mass Determination ◽  
Multiple Star ◽  
Preliminary Results ◽  
Seminal Work ◽  
Comprehensive Survey ◽  
Solar Type ◽  
Targeted Observations

AbstractStellar multiplicity is a fundamental astrophysical property. In addition to being the only physical basis for accurate mass determination, this parameter is believed to influence important aspects such as planet formation and stability. Contrary to earlier expectations, recent studies have shown that even against selection biases, as many as 23% of the planetary systems reside in multiple star systems (Raghavan et al. 2006)). Leveraging recent efforts in identifying stellar and substellar companions to solar-type stars, and augmenting them with targeted observations, we are conducting a comprehensive survey, aimed at providing a modern update to the seminal work of Duquennoy & Mayor (1991). The details of our sample, survey methods, and some preliminary results are presented here.

scholarly journals Изменение состава ионного тока в процессе полевого испарения вольфрама при высоких температурах

2019 ◽  
Vol 89 (7) ◽  
pp. 1105
Author(s):  
О.Л. Голубев ◽  
Н.М. Блашенков
Keyword(s):  
Steady State ◽  
High Temperatures ◽  
Mass Spectrometer ◽  
Isotopic Ratio ◽  
Ion Source ◽  
Ion Currents ◽  
Evaporation Process ◽  
Field Evaporation ◽  
Magnetic Mass ◽  
Charged Ions

Steady-state field evaporation of tungsten at high temperatures (T ~ 2000 K) has been studied using a magnetic mass spectrometer equipped with the field ion source. Only low-charged ions (W+2 and W+) have been observed in the course of evaporation. The distribution of the ion currents by tungsten isotopes correspondents to standart isotopic ratio for natural tungsten. Some deviations from standart isotopic ratio were observed owing to fluctuations and unstable nature of evaporation process. O.L. Golubev, N.M. Blashenkov

scholarly journals Accurate Binary Mass Determinations: Goals, Limitations, and Prospects

1995 ◽  
Vol 166 ◽  
pp. 187-192
Author(s):  
J. Andersen
Keyword(s):  
High Precision ◽  
Binary Stars ◽  
State Of The Art ◽  
The State ◽  
Accurate Mass ◽  
Mass Determination ◽  
Auxiliary Data ◽  
Typical System ◽  
Stellar Masses ◽  
Precision Astrometry

The state of the art in accurate mass determination for binary stars is reviewed, and the angular sizes and their errors are computed for a typical system from the existing high-precision sample. It appears that sub-μas (microarcsecond) absolute astrometry will be needed in order to improve the accuracy substantially by astrometry alone. The types of system, and the kinds of data, where precision astrometry appears most promising are outlined. Finally, astrophysical applications of such accurate stellar masses, and the auxiliary data required in them, are briefly reviewed.

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