diff --git a/tests/data/dataconverter/readers/mpes/Ref_nexus_mpes.log b/tests/data/dataconverter/readers/mpes/Ref_nexus_mpes.log
index 4d6b4f6d7..0335700f5 100644
--- a/tests/data/dataconverter/readers/mpes/Ref_nexus_mpes.log
+++ b/tests/data/dataconverter/readers/mpes/Ref_nexus_mpes.log
@@ -5253,7 +5253,7 @@ DEBUG -
 				increasing displacement. For general axes, an appropriate direction
 				should be chosen.
 			
-DEBUG - ===== GROUP (//entry/sample [NXmpes::/NXentry/NXsample]): <HDF5 group "/entry/sample" (13 members)>
+DEBUG - ===== GROUP (//entry/sample [NXmpes::/NXentry/NXsample]): <HDF5 group "/entry/sample" (11 members)>
 DEBUG - classpath: ['NXentry', 'NXsample']
 DEBUG - classes:
 NXmpes.nxdl.xml:/ENTRY/SAMPLE
@@ -5395,33 +5395,6 @@ DEBUG -
              nominal setpoint or average value
              - need [n] as may be a vector
         
-DEBUG - ===== FIELD (//entry/sample/chemical_formula): <HDF5 dataset "chemical_formula": shape (), type "|O">
-DEBUG - value: b'MoTe2' 
-DEBUG - classpath: ['NXentry', 'NXsample', 'NX_CHAR']
-DEBUG - classes:
-NXsample.nxdl.xml:/chemical_formula
-DEBUG - <<OPTIONAL>>
-DEBUG - documentation (NXsample.nxdl.xml:/chemical_formula):
-DEBUG - 
-             The chemical formula specified using CIF conventions.
-             Abbreviated version of CIF standard:
-             
-             * Only recognized element symbols may be used.
-             * Each element symbol is followed by a 'count' number. A count of '1' may be omitted.
-             * A space or parenthesis must separate each cluster of (element symbol + count).
-             * Where a group of elements is enclosed in parentheses, the multiplier for the
-               group must follow the closing parentheses. That is, all element and group
-               multipliers are assumed to be printed as subscripted numbers.
-             * Unless the elements are ordered in a manner that corresponds to their chemical
-               structure, the order of the elements within any group or moiety depends on
-               whether or not carbon is present.
-             * If carbon is present, the order should be:
-             
-               - C, then H, then the other elements in alphabetical order of their symbol.
-               - If carbon is not present, the elements are listed purely in alphabetic order of their symbol.
-               
-             * This is the *Hill* system used by Chemical Abstracts.
-        
 DEBUG - ===== FIELD (//entry/sample/depends_on): <HDF5 dataset "depends_on": shape (), type "|O">
 DEBUG - value: b'/entry/sample/transformations/corrected_phi' 
 DEBUG - classpath: ['NXentry', 'NXsample', 'NX_CHAR']
@@ -5576,20 +5549,6 @@ DEBUG - documentation (NXsample.nxdl.xml:/name):
 DEBUG - 
              Descriptive name of sample
         
-DEBUG - ===== FIELD (//entry/sample/physical_form): <HDF5 dataset "physical_form": shape (), type "|O">
-DEBUG - value: b'thin film' 
-DEBUG - classpath: ['NXentry', 'NXsample', 'NX_CHAR']
-DEBUG - classes:
-NXmpes.nxdl.xml:/ENTRY/SAMPLE/physical_form
-NXsample.nxdl.xml:/physical_form
-DEBUG - <<RECOMMENDED>>
-DEBUG - documentation (NXmpes.nxdl.xml:/ENTRY/SAMPLE/physical_form):
-DEBUG - 
-DEBUG - documentation (NXsample.nxdl.xml:/physical_form):
-DEBUG - 
-             Physical form of the sample material.
-             Examples include single crystal, foil, pellet, powder, thin film, disc, foam, gas, liquid, amorphous.
-        
 DEBUG - ===== FIELD (//entry/sample/preparation_date): <HDF5 dataset "preparation_date": shape (), type "|O">
 DEBUG - value: b'2019-05-22T14:00:00+00:00' 
 DEBUG - classpath: ['NXentry', 'NXsample', 'NX_DATE_TIME']
diff --git a/tests/data/dataconverter/readers/mpes/config_file.json b/tests/data/dataconverter/readers/mpes/config_file.json
index e4310363e..ba800ccf0 100644
--- a/tests/data/dataconverter/readers/mpes/config_file.json
+++ b/tests/data/dataconverter/readers/mpes/config_file.json
@@ -264,12 +264,10 @@
   "/ENTRY[entry]/SAMPLE[sample]": {
     "preparation_date": "@attrs:metadata/sample/preparation_date",
     "sample_history/notes": "@attrs:metadata/sample/sample_history",
-    "chemical_formula": "@attrs:metadata/sample/chemical_formula",
     "description": "@attrs:metadata/sample/chemical_formula",
     "name": "@attrs:metadata/sample/chemical_formula",
     "situation": "vacuum",
-    "SUBSTANCE[substance]/molecular_formula_hill": "@link:/entry/sample/chemical_formula",
-    "physical_form": "thin film",
+    "SUBSTANCE[substance]/molecular_formula_hill": "@attrs:metadata/sample/chemical_formula",
     "temperature": {
       "temperature_sensor": "@link:/entry/instrument/manipulator/temperature_sensor"
     },