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Atomic Species Spectroscopic Constants
Molecular Species Spectroscopic Constants
H
2
H
2
+
H
2
-
C
2
C
2
+
C
2
-
CH
CH
+
CH
-
CN
CN
+
CN
-
CO
CO
+
CO
-
CO
2
CO
2
+
N
2
N
2
+
N
2
-
NH
NH
+
NH
-
NO
NO
+
NO
-
O
2
O
2
+
O
2
-
OH
OH
+
OH
-
Electronic Levels
Bound-Bound Transitions
Bound-Free Transitions
Free-Free Transitions
A
2
Σ
+
-
X
2
Π
2
(Gamma system)
B
2
Π
r
-
X
2
Π
r
(Beta system)
B'
2
Δ-
X
2
Π
r
(Beta Prime system)
C
2
Π-
X
2
Π
r
(Delta system)
D
2
Σ
+
-
X
2
Π
r
(Epsilon system)
E
2
Σ
+
-
X
2
Π
r
(Gamma Prime system)
Please choose an option
Last modified on July 23, 2026.
