Influence of Critical Flow in the Differentially Pumped Chamber AQUASEM
Advances in Military Technology, 2017 The article deals with the effect of the critical flow, which is examined at pumping of the differential pumping chamber of the Environmental Scanning Electron Microscope (ESEM). The article compares the state of the flow in the area of pumped chamber at pressure ratio on the apertures when the critical flow occurs and its advantages in design of the ...
P. Hlavatá +4 more
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Differentially pumped molecular beam extraction system to probe catalytic chemistry at ambient pressure conditions: A CFD-aided design [PDF]
AIP AdvancesWe report a design and finite element fluid-dynamics modeling of a differentially pumped molecular beam extraction system. The system relies on two stages of pumping and consists of three sections: a catalytic reactor, a differential chamber, and an ...
Satya P. Joshi +5 more
doaj +1 more source
Analysis of Impact of Conic Aperture in Differentially Pumped Chamber
Advances in Military Technology, 2019 The paper focuses on the simulation of medium dynamics in the environmental scanning electron microscope. In particular, the paper examines the conical aperture location effect in the differentially pumped chamber and the width of the pumping channel in this chamber.
J. Maxa, P. Hlavatá, P. Vyroubal
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An experimental investigation of natural convection with solidification in a differentially heated cavity [PDF]
, 2007 This paper introduces an experimental rig used to produce data for the validation of computational models of natural convection within water in an enclosed cavity.
Braga +11 more
core +1 more source
Hyperthermal neutral beam etching [PDF]
, 1995 A pulsed beam of hyperthermal fluorine atoms with an average translational energy of 4.8 eV has been used to demonstrate anisotropic etching of Si.
Giapis, Konstantinos P. +2 more
core +1 more source
Comparisons Using Methods of Continuum Mechanics and Monte Carlo at Differentially Pumped Chamber
Advances in Military Technology, 2016 The article deals with the analysis of gas flows in pumped canals in differential pumped chamber of the Environmental Scanning Electron Microscope (ESEM). The article compares and verifies existing results of differentially pumped chamber flow simulation from ANSYS Fluent system, which uses the mechanics of continuum, with the ones published by D ...
Maxa, Jiří +4 more
openaire +3 more sources
A sub-Doppler resolution double resonance molecular beam infrared spectrometer operating at chemically relevant energies (~2 eV) [PDF]
, 2000 A molecular beam spectrometer capable of achieving sub-Doppler resolution at 2 eV (~18 000 cm^–1) of vibrational excitation is described and its performance demonstrated using the CH stretch chromophore of HCN.
Callegari, A. +5 more
core +1 more source
Generation of energetic He atom beams by a pulsed positive corona discharge [PDF]
, 1997 Time-of-flight measurements were made of neutral helium atom beams extracted from a repetitive, pulsed, positive-point corona discharge. Two strong neutral peaks, one fast and one slow, were observed, accompanied by a prompt photon peak and a fast ion ...
Blumberg, Seth +6 more
core +1 more source
Loading of a Rb magneto-optic trap from a getter source [PDF]
, 2001 We study the properties of a Rb magneto-optic trap loaded from a commercial getter source which provides a large flux of atoms for the trap along with the capability of rapid turn-off necessary for obtaining long trap lifetimes.
A.M. Steane +13 more
core +3 more sources
Formation of Hydrogen, Oxygen, and Hydrogen Peroxide in Electron Irradiated Crystalline Water Ice
, 2005 Water ice is abundant both astrophysically, for example in molecular clouds, and in planetary systems. The Kuiper belt objects, many satellites of the outer solar system, the nuclei of comets and some planetary rings are all known to be water-rich ...
Averna D. +11 more
core +1 more source