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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
b
3
Σ-
a
3
Π (Ballik-Ramsay Bands)
A
1
Π-
X
1
Σ (Phillips system)
d
3
Π-
a
3
Π (Swan Bands)
C
1
Π-
A
1
Π (Deslandres-d'Azambuja Bands)
e
3
Π-
a
3
Π (Fox-Herzberg Bands)
D
1
Σ-
X
1
Σ (Mulliken system)
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Last modified on July 23, 2026.
