diff --git a/js/photon-absorption/model/Molecule.js b/js/photon-absorption/model/Molecule.js
index 251da5f4..18a0131a 100644
--- a/js/photon-absorption/model/Molecule.js
+++ b/js/photon-absorption/model/Molecule.js
@@ -142,7 +142,7 @@ define( function( require ) {
     this.photonEmittedEmitter = new Emitter();
 
     // @public Emitter for 'brokeApart' event
-    this.brokeApartEmitter = new Emitter();
+    this.brokeApartEmitter = new Emitter( { validationEnabled: false } );
   }
 
   moleculesAndLight.register( 'Molecule', Molecule );
diff --git a/js/photon-absorption/model/molecules/NO2.js b/js/photon-absorption/model/molecules/NO2.js
index 4c178dd2..51566a49 100644
--- a/js/photon-absorption/model/molecules/NO2.js
+++ b/js/photon-absorption/model/molecules/NO2.js
@@ -141,7 +141,7 @@ define( function( require ) {
       // Create the constituent molecules that result from breaking apart and add them to the activeMolecules observable array.
       var nitrogenMonoxideMolecule = new NO();
       var singleOxygenMolecule = new O();
-      this.brokeApartEmitter.emit2( nitrogenMonoxideMolecule, singleOxygenMolecule );
+      this.brokeApartEmitter.emit( nitrogenMonoxideMolecule, singleOxygenMolecule );
 
       // Set up the direction and velocity of the constituent molecules. These are set up mostly to look good, and their
       // directions and velocities have little if anything to do with any physical rules of atomic dissociation.  If
diff --git a/js/photon-absorption/model/molecules/O3.js b/js/photon-absorption/model/molecules/O3.js
index de5986d8..edcf93e3 100644
--- a/js/photon-absorption/model/molecules/O3.js
+++ b/js/photon-absorption/model/molecules/O3.js
@@ -134,7 +134,7 @@ define( function( require ) {
       // Create the constituent molecules that result from breaking apart.
       var diatomicOxygenMolecule = new O2();
       var singleOxygenMolecule = new O();
-      this.brokeApartEmitter.emit2( diatomicOxygenMolecule, singleOxygenMolecule );
+      this.brokeApartEmitter.emit( diatomicOxygenMolecule, singleOxygenMolecule );
 
       // Set up the direction and velocity of the constituent molecules. These are set up mostly to look good, and their
       // directions and velocities have little if anything to do with any physical rules of atomic dissociation.  If