NXoptical_system_em¶
Status:
base class, extends NXobject
Description:
A container for qualifying an electron optical system.
Symbols:
No symbol table
- Groups cited:
none
Structure:
camera_length: (optional) NX_NUMBER {units=NX_LENGTH}
Citing the JEOL TEM glossary this is an effective distance from a specimen to a plane where an observed diffraction pattern is formed.
magnification: (optional) NX_NUMBER {units=NX_DIMENSIONLESS}
The factor of enlargement of the apparent size, not physical size, of an object.
defocus: (optional) NX_NUMBER {units=NX_LENGTH}
The defocus aberration constant oftentimes taken as the C_1_0 which is described in more details in NXaberration.
semi_convergence_angle: (optional) NX_NUMBER {units=NX_ANGLE}
Citing the JEOL TEM glosssary this is the value when a cone shaped, convergent electron beam illuminates a specimen, the semi-angle of the cone is termed convergence angle.
field_of_view: (optional) NX_NUMBER {units=NX_LENGTH}
The extent of the observable parts of the specimen given the current magnification and other settings of the instrument.
working_distance: (optional) NX_FLOAT {units=NX_LENGTH}
Citing Globalsino this is a distance between the specimen and the lower pole piece in SEM system.
beam_current: (optional) NX_FLOAT {units=NX_CURRENT}
Beam current as measured relevant for the illumination of the specimen. Users should specify further details like how the beam current was measured using the beam_current_description field.
beam_current_description: (optional) NX_CHAR
Specify further details how the beam current was measured or estimated.
Hypertext Anchors¶
List of hypertext anchors for all groups, fields, attributes, and links defined in this class.
