Rotational analysis of the A 0u+, B 0u+ — X 0g+ systems of gaseous Te2

A detailed rotational analysis has been made of 114 absorption bands of the main systems of 128Te2 and 130Te2 in the wavelength region 385.5 to 523.5 nm (3855 to 5235 Å). In addition eight emission bands of 128Te2 between 617 and 634 nm (6170 and 6340 Å) have been analysed. Only one lower state, the 0g+ component of 3∑g–, has been recognized, but the bands involve two upper states, B 0u+, which has been known for many years, and a new lower lying state of the same character, A 0u+. The vibrational numbering in both transitions has been established. The levels in B 0u+ are subject to numerous small perturbations and to a large homogeneous perturbation for v ≽ 20. The vibrational levels in A 0u+ extrapolate smoothly to a limit at about 25920 cm-1 above v" = 0. If the products at this limit are Te(3P2) + Te(3P0), D00 = 21210 cm-1 (2.63 eV). Other constants (cm-1, for 130Te2) are as follows: state Te ωexeωe 103yeωe 102Be 104αere/nm re/Å B 0u+ 22207.4 162.3 0.45 –11.09 3.254 1.25 0.2824 2.824 A 0u+ 19450.8 143.6 0.45 –3.892 3.124 1.30 0.2882 2.882 X 0g+ 0 247.07 0.515 –0.55 3.968 1.06 0.25774 2.5774