diff --git a/include/cantera/spectra/LineBroadener.h b/include/cantera/spectra/LineBroadener.h
index 3b4e890b8..0ffdecde3 100644
--- a/include/cantera/spectra/LineBroadener.h
+++ b/include/cantera/spectra/LineBroadener.h
@@ -6,6 +6,7 @@
 
 #include "cantera/base/ct_defs.h"
 #include "cantera/base/ctexceptions.h"
+#include "cantera/base/global.h"
 
 namespace Cantera
 {
@@ -14,6 +15,7 @@ namespace Cantera
  * Base class for classes implementing line shapes of
  * various types.
  * @ingroup spectroscopy
+ * @deprecated incomplete / abandoned
  */
 class LineBroadener
 {
@@ -21,7 +23,9 @@ class LineBroadener
 public:
 
     /// Default constructor
-    LineBroadener() {}
+    LineBroadener() {
+        warn_deprecated("class LineBroadener");
+    }
 
     /// Destructor
     virtual ~LineBroadener() {}
diff --git a/include/cantera/spectra/rotor.h b/include/cantera/spectra/rotor.h
index d7bf84b1b..fb0efa110 100644
--- a/include/cantera/spectra/rotor.h
+++ b/include/cantera/spectra/rotor.h
@@ -14,6 +14,7 @@
  */
 
 #include "cantera/base/ct_defs.h"
+#include "cantera/base/global.h"
 
 /**
  * Namespace for spectroscopic functions and classes.
@@ -24,13 +25,16 @@ namespace Cantera
 /**
  * Class Rotor represents a non-rigid quantum-mechanical rotor.
  * @ingroup spectroscopy
+ * @deprecated incomplete / abandoned
  */
 class Rotor
 {
 public:
 
     /// Default Constructor.
-    Rotor() {}
+    Rotor() {
+        warn_deprecated("class Rotor");
+    }
 
     /// Destructor.
     virtual ~Rotor() {}
diff --git a/src/spectra/Nuclei.h b/src/spectra/Nuclei.h
index 64414695f..130e42fc3 100644
--- a/src/spectra/Nuclei.h
+++ b/src/spectra/Nuclei.h
@@ -6,6 +6,7 @@
 #define CT_NUCL_H
 
 #include "cantera/base/ct_defs.h"
+#include "cantera/base/global.h"
 
 namespace Cantera
 {
@@ -15,6 +16,7 @@ namespace Cantera
  * information, and are designed only to handle nuclear statistics
  * effects on spectra.
  * @ingroup spectroscopy
+ * @deprecated incomplete / abandoned
  */
 class Nucleus
 {
@@ -22,7 +24,9 @@ public:
     Nucleus(const std::string& symbol,
             int nP, int nN, doublereal spin) : m_np(nP),
         m_nn(nN), m_spin(spin),
-        m_sym(symbol) {}
+        m_sym(symbol) {
+            warn_deprecated("class Nucleus");
+        }
     virtual ~Nucleus() {}
     int nProtons() {
         return m_np;