NXpulser_apm¶
Status:
base class, extends NXobject
Description:
Metadata for laser- and/or voltage-pulsing in atom probe microscopy.
Symbols:
The symbols used in the schema to specify e.g. dimensions of arrays.
n_ions: Total number of ions collected.
- Groups cited:
NXbeam, NXcollection, NXfabrication, NXsource, NXtransformations
Structure:
pulse_mode: (optional) NX_CHAR
How is field evaporation physically triggered.
Any of these values:
laser|voltage|laser_and_voltagepulse_frequency: (optional) NX_FLOAT {units=NX_FREQUENCY}
Frequency with which the high voltage or laser pulser fires.
pulse_fraction: (optional) NX_FLOAT {units=NX_DIMENSIONLESS}
Fraction of the pulse_voltage that is applied in addition to the standing_voltage at peak voltage of a pulse.
pulsed_voltage: (optional) NX_FLOAT (Rank: 1, Dimensions: [n_ions]) {units=NX_VOLTAGE}
In laser pulsing mode the values will be zero so the this field is recommended. However, for voltage pulsing mode it is highly recommended that users report the pulsed_voltage.
standing_voltage: (optional) NX_FLOAT (Rank: 1, Dimensions: [n_ions]) {units=NX_VOLTAGE}
Direct current voltage between the specimen and the (local electrode) in the case of local electrode atom probe (LEAP) instrument.
FABRICATION: (optional) NXfabrication
laser_gun: (optional) NXsource
Atom probe microscopes use controlled laser, voltage, or a combination of pulsing strategies to trigger the excitation and eventual field evaporation/emission of an ion during an experiment.
name: (optional) NX_CHAR
Given name/alias.
wavelength: (optional) NX_FLOAT {units=NX_WAVELENGTH}
Nominal wavelength of the laser radiation.
power: (optional) NX_FLOAT {units=NX_POWER}
Nominal power of the laser source while illuminating the specimen.
pulse_energy: (optional) NX_FLOAT {units=NX_ENERGY}
Average energy of the laser at peak of each pulse.
FABRICATION: (optional) NXfabrication
TRANSFORMATIONS: (optional) NXtransformations
Affine transformations which describe the geometry how the laser focusing optics/pinhole-attached coordinate system is defined, how it has to be transformed so that it aligns with the specimen coordinate system. A right-handed Cartesian coordinate system, the so-called laser space, should be assumed, whose positive z-axis points into the direction of the propagating laser beam.
laser_beam: (optional) NXbeam
Details about specific positions along the focused laser beam which illuminates the (atom probe) specimen.
pinhole_position: (optional) NXcollection
Track time-dependent settings over the course of the measurement where the laser beam exits the focusing optics.
spot_position: (optional) NXcollection
Track time-dependent settings over the course of the measurement where the laser hits the specimen.
Hypertext Anchors¶
List of hypertext anchors for all groups, fields, attributes, and links defined in this class.
