3.3.2.26. NXxas

Status:

application definition, extends NXobject

Description:

This is an application definition for raw data from an X-ray absorption spectroscopy experiment.

This is essentially a scan on energy versus incoming/ absorbed beam.

Symbols:

No symbol table

Groups cited:

NXdata, NXdetector, NXentry, NXinstrument, NXmonitor, NXmonochromator, NXsample, NXsource

Structure:

(entry): (required) NXentry

@entry: (required) NX_CHAR

NeXus convention is to use “entry1”, “entry2”, ... for analysis software to locate each entry.

title: (required) NX_CHAR

start_time: (required) NX_DATE_TIME

definition: (required) NX_CHAR

Official NeXus NXDL schema to which this file conforms

Obligatory value: NXxas

(instrument): (required) NXinstrument

(source): (required) NXsource

type: (required) NX_CHAR

name: (required) NX_CHAR

probe: (required) NX_CHAR

Obligatory value: x-ray

monochromator: (required) NXmonochromator

energy[np]: (required) NX_FLOAT

incoming_beam: (required) NXdetector

data[np]: (required) NX_INT

absorbed_beam: (required) NXdetector

data[np]: (required) NX_INT

mark this field with attribute signal=1

(sample): (required) NXsample

name: (required) NX_CHAR

Descriptive name of sample

(monitor): (required) NXmonitor

mode: (required) NX_CHAR

Count to a preset value based on either clock time (timer) or received monitor counts (monitor).

Any of these values: monitor | timer

preset: (required) NX_FLOAT

preset value for time or monitor

data[np]: (required) NX_INT

(data): (required) NXdata

energy –> /entry/instrument/monochromator/energy

absorbed_beam –> /entry/instrument/absorbed_beam/data

NXDL Source:

https://github.com/nexusformat/definitions/blob/master/applications/NXxas.nxdl.xml