Rotational analysis of the A 0 u + , B 0 u + — X 0 g + systems of gaseous Te 2

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