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NXaberration_model.nxdl.xml
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NXaberration_model.nxdl.xml
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<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="nxdlformat.xsl"?>
<!--
# NeXus - Neutron and X-ray Common Data Format
#
# Copyright (C) 2014-2024 NeXus International Advisory Committee (NIAC)
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 3 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# For further information, see http://www.nexusformat.org
-->
<definition xmlns="http://definition.nexusformat.org/nxdl/3.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" category="base" type="group" extends="NXobject" name="NXaberration_model" xsi:schemaLocation="http://definition.nexusformat.org/nxdl/3.1 ../nxdl.xsd">
<doc>
Models for aberrations of electro-magnetic lenses in electron microscopy.
See `S. J. Pennycock and P. D. Nellist <https://doi.org/10.1007/978-1-4419-7200-2>`_ (page 44ff, and page 118ff)
for different definitions available and further details. Table 7-2 of Ibid.
publication (page 305ff) documents how to convert from the NION to the
CEOS definitions.
</doc>
<field name="model">
<enumeration>
<item value="ceos"/>
<item value="nion"/>
</enumeration>
</field>
<group type="NXaberration"/>
<field name="c_1_0" type="NX_FLOAT" units="NX_LENGTH">
<doc>
Defocus
</doc>
</field>
<field name="c_1_2_a" type="NX_FLOAT" units="NX_LENGTH">
<doc>
Two-fold astigmatism
</doc>
</field>
<field name="c_1_2_b" type="NX_FLOAT" units="NX_LENGTH">
<doc>
Two-fold astigmatism
</doc>
</field>
<field name="c_2_1_a" type="NX_FLOAT" units="NX_LENGTH">
<doc>
Second-order axial coma
</doc>
</field>
<field name="c_2_1_b" type="NX_FLOAT" units="NX_LENGTH">
<doc>
Second-order axial coma
</doc>
</field>
<field name="c_2_3_a" type="NX_FLOAT" units="NX_LENGTH">
<doc>
Threefold astigmatism
</doc>
</field>
<field name="c_2_3_b" type="NX_FLOAT" units="NX_LENGTH">
<doc>
Threefold astigmatism
</doc>
</field>
<field name="c_3_0" type="NX_FLOAT" units="NX_LENGTH">
<doc>
Spherical aberration
</doc>
</field>
<field name="c_3_2_a" type="NX_FLOAT" units="NX_LENGTH">
<doc>
Star aberration
</doc>
</field>
<field name="c_3_2_b" type="NX_FLOAT" units="NX_LENGTH">
<doc>
Star aberration
</doc>
</field>
<field name="c_3_4_a" type="NX_FLOAT" units="NX_LENGTH">
<doc>
Fourfold astigmatism
</doc>
</field>
<field name="c_3_4_b" type="NX_FLOAT" units="NX_LENGTH">
<doc>
Fourfold astigmatism
</doc>
</field>
<field name="c_5_0" type="NX_FLOAT" units="NX_LENGTH">
<doc>
Fifth-order spherical aberration
</doc>
</field>
</definition>