accelerating voltage

accelerating voltage

The voltage applied to a source in mass spectrometry to move ions formed in the source into the instrument’s mass analyser. Accelerating voltage can range from less than 100 volts in quadrupole mass spectrometers, to several thousand volts in sector instruments or in time-of-flight mass spectrometers.
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The first spectrum (Figure 27, left) was recorded with an accelerating voltage of 24 kV, typical for the detection of chromophoric elements in corundum (i.
In addition, earlier benchtop units were restricted to one accelerating voltage, thereby limiting resolution capability.
The SEM is suitable for low accelerating voltage X-ray spectroscopy and cathodoluminescence, combining large beam currents with a small interaction volume and increasing analytical resolution to the sub-100-nm scale.
These settings are referred to as the x-ray tube accelerating voltage, or kilo volts (kV), and the tube power, or watts (W) used to set the tube at appropriate levels to obtain an image with optimal contrast at the detector.
As it is known the penetration depth, the geometry of the processing zone depends on many parameters like: electron beam current, accelerating voltage, electron beam diameter, electron beam power, etc.
The matrix model of the system includes the effects of the main factors: working distance, transversal deflecting angle, the electron beam current, accelerating voltage, and linear speed of the workpiece, on the output parameter the hardening band width--[L.
In simple terms, these factors are, themselves, determined by the choice of electron source and the accelerating voltage of the electron column.
At first the sections were viewed in the secondary electron imaging mode (standard operational mode) at following settings: working distance 15 mm, accelerating voltage 3 kV.
At a constant accelerating voltage, the beam current determines the dose rate.
A typical range of values for the mean energy loss is about 20 eV to 50 eV which is very small compared to the microscope accelerating voltage.
Also, set accelerating voltage and beam current precisely to get reproducible results.
In setting up the conditions for quantitative wavelength-dispersive electron microprobe analysis a number of parameters have to be defined for each element, namely accelerating voltage, beam current, and (for each element) x-ray line, spectrometer crystal, pulse-height analyser settings, background offsets, and counting times for peak and background.