Abstract
A detailed rotational analysis has been made of 114 absorption bands of the main systems of
128
Te
2
and
130
Te
2
in the wavelength region 385.5 to 523.5 nm (3855 to 5235 Å). In addition eight emission bands of
128
Te
2
between 617 and 634 nm (6170 and 6340 Å) have been analysed. Only one lower state, the 0
g
+
component of
3
∑
g
–
, has been recognized, but the bands involve two upper states, B 0
u
+
, which has been known for many years, and a new lower lying state of the same character, A 0
u
+
. The vibrational numbering in both transitions has been established. The levels in B 0
u
+
are subject to numerous small perturbations and to a large homogeneous perturbation for
v
≽ 20. The vibrational levels in A 0
u
+
extrapolate smoothly to a limit at about 25920 cm
-1
above
v
" = 0. If the products at this limit are Te(
3
P
2
) + Te(
3
P
0
),
D
0
0
= 21210 cm
-1
(2.63 eV). Other constants (cm
-1
, for
130
Te
2
) are as follows: state
T
e
ω
e
x
e
ω
e
10
3
y
e
ω
e
10
2
B
e
10
4
α
e
r
e
/nm
r
e
/Å B 0
u
+
22207.4 162.3 0.45 –11.09 3.254 1.25 0.2824 2.824 A 0
u
+
19450.8 143.6 0.45 –3.892 3.124 1.30 0.2882 2.882 X 0
g
+
0 247.07 0.515 –0.55 3.968 1.06 0.25774 2.5774
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