[new Term] beam current
Term raised in the meeting today.
The term is important when studying beam induced alteration of the sample
label: filament current
synonyms:
exact_synonyms: > source current
definition:
definition_en: >
Electrical current which is flows through the electron source.
comments:
comments: >
This is typically used for heating a source. The source (i.e. tungsten wire,
LaB_6 crystal, tungsten crystal) is the element from which electrons are emitted).
Higher filament currents will result in higher beam currents.
label: beam current
definition:
definition_en: >
Electrical current which flows along the beam path.
comments:
comments_en: >
The beam current most frequently consists of electrons, but may also consist of ions in
some cases. The beam current varies along the beam axis as electrons are filtered out.
The points at which beam current is measured varies between instruments and
manufacturer. The beam current an also be understood as beam flux times charge
of the individual particles.
label: beam flux
definition:
definition_en: >
Number of particles which flow within the beam per unit time.
comments:
comments_en: >
label: beam
definition:
definition_en: >
Stream or particles which flows from source to detector.
comments:
comments_en: >
label: beam path
definition:
definition_en: >
Axis along which the beam flows.
comments:
comments_en: >
label: electrical beam
synonyms:
exact_synonyms: >
- electron beam
definition:
definition_en: >
A beam which consists of electrons.
comments:
comments_en: >
To be added
label: emission current
synonyms:
exact_synonyms: >
- source current
definition:
definition_en: >
Electrical current which is exited from the source.
comments:
comments: >
Emission current can not be reliably measured as it varies with angle. It is typically measured
at the first anode. The value is an indicator associated with a particular instrument rather
than a dependable constant. It can also vary with manufacturer.
label: probe current
definition:
definition_en: >
Electrical current which arriving at the specimen.
comments:
comments:>
to be added.
additional terms to be defined (in this cluster):
-
beam path -
electron beam - electrical current? - i would say that is general knowledge and well defined in physics
- column - in what sense? need more information on that.
- source - that should be moved to another issue