3.3.3.94. NXstm

Status:

application definition (contribution), extends NXspm

Description:

An application definition to describe Scanning Tunneling Microscopy (STM).

Symbols:

No symbol table

Groups cited:

NXcollection, NXentry, NXenvironment, NXinstrument, NXlockin, NXsensor, NXspm_scan_control

Structure:

ENTRY: (required) NXentry ⤆

definition: (required) NX_CHAR ⤆

Name of the definition that is used for the STM technique. …

Name of the definition that is used for the STM technique.

Obligatory value: NXstm

scan_mode: (required) NX_CHAR ⤆

The mode of the scan that is performed. Two commonly used modes are constan …

The mode of the scan that is performed. Two commonly used modes are constant height mode and constant current mode.

Any of these values: constant height | constant current

experiment_technique: (required) NX_CHAR ⤆

The specific to STM experiment. …

The specific to STM experiment.

Obligatory value: STM

INSTRUMENT: (required) NXinstrument ⤆

lockin_amplifier: (required) NXlockin ⤆

The lock-in amplifier information. The device is being used to extract …

The lock-in amplifier information. The device is being used to extract the very weak signal buried in noisy signals.

modulation_signal: (recommended) NX_CHAR {units=NX_UNITLESS} ⤆

The type of the signal (voltage or current) subject to modulation.

SCAN_ENVIRONMENT: (required) NXenvironment ⤆

The environment information for stm or sts experiment. …

The environment information for stm or sts experiment.

Note: At least one field from head_temperature, cryo_bottom_temperature and cryo_shield_temperature must be provided.

SPM_SCAN_CONTROL: (required) NXspm_scan_control ⤆

The scan control information like scan region or phase space, e.g. patte …

The scan control information like scan region or phase space, e.g. pattern of scan (e.g. mesh), scanner speed, etc.

lockin_status: (recommended) NX_BOOLEAN

The status of the lock-in amplifier. It is well established convention t …

The status of the lock-in amplifier. It is well established convention that for topographic measurements lockin amplifier is turned off state while current scan lockin amplifier is turned on.

head_temperature_sensor: (optional) NXsensor ⤆

This should be a link to …

This should be a link to /entry/instrument/head_temperature_sensor

cryo_bottom_temperature_sensor: (optional) NXsensor ⤆

This should be a link to …

This should be a link to /entry/instrument/cryo_bottom_temperature_sensor

cryo_shield_temperature_sensor: (optional) NXsensor ⤆

This should be a link to …

This should be a link to /entry/instrument/cryo_shield_temperature_sensor

bias_spectroscopy_environment: (optional) NXenvironment ⤆

To explain bias and current behavior (sweep measurement) due to voltage …

To explain bias and current behavior (sweep measurement) due to voltage applied to the sample.

reproducibility_indicators: (optional) NXcollection ⤆

The group’s concepts hold the link to the related concepts that define the …

The group’s concepts hold the link to the related concepts that define the reproducibility of the STM experiment.

current: (optional) NX_NUMBER

The tunneling current between tip and sample after application of bias vol …

The tunneling current between tip and sample after application of bias voltage. This should be a link to /entry/instrument/current_sensor/current

current_offset: (optional) NX_NUMBER

The offset in tunneling current between tip and sample after application o …

The offset in tunneling current between tip and sample after application of bias voltage. This should be a link to /entry/instrument/current_sensor/current_offset

BIAS_SWEEP: (optional) NXspm_scan_control

Bias sweep measurement in bias spectroscopy. …

Bias sweep measurement in bias spectroscopy. This should be a link to /entry/instrument/bias_spectroscopy_environment/bias_spectroscopy/bias_sweep

modulation_signal_type: (optional) NX_CHAR ⤆

This is the signal on which the modulation voltage or current will be adde …

This is the signal on which the modulation voltage or current will be added. This should be a link to /entry/instrument/phase_lock_loop/modulation_signal

reference_frequency: (optional) NX_NUMBER

The frequency of the sine modulation that is used as a carrier signal of i …

The frequency of the sine modulation that is used as a carrier signal of input signal in lock-in.

This should be a link to /entry/instrument/lockin_amplifier/reference_frequency

resolution_indicators: (optional) NXcollection ⤆

The group’s concepts hold the link to the related concepts that define the …

The group’s concepts hold the link to the related concepts that define the resolution of the STM experiment.

head_temperature: (optional) NX_NUMBER

This should be a link to …

This should be a link to /entry/instrument/scan_environment/head_temperature

cryo_bottom_temperature: (optional) NX_NUMBER

This should be a link to …

This should be a link to /entry/instrument/scan_environment/cryo_bottom_temperature

cryo_shield_temperature: (optional) NX_NUMBER

This should be a link to …

This should be a link to /entry/instrument/scan_environment/cryo_shield_temperature

BIAS_SWEEP: (optional) NXspm_scan_control

This should be a link to …

This should be a link to /entry/instrument/bias_spectroscopy_environment/bias_spectroscopy/bias_sweep

modulation_signal_type: (optional) NX_CHAR ⤆

This is the signal on which the modulation voltage or current will be adde …

This is the signal on which the modulation voltage or current will be added. This should be a link to /entry/instrument/lockin_amplifier/modulation_signal_type

reference_frequency: (optional) NX_NUMBER

The frequency of the sine modulation that is used to modulate the signal i …

The frequency of the sine modulation that is used to modulate the signal in lock-in. This should be a link to /entry/instrument/lockin_amplifier/reference_frequency

Hypertext Anchors

List of hypertext anchors for all groups, fields, attributes, links, and symbols defined in this class.

NXDL Source:

https://github.com/nexusformat/definitions/blob/main/contributed_definitions/NXstm.nxdl.xml