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Abstract: Doppler-limited vib-rotational absorption spectra of the A ← X electronic transition of I35/37Cl are measured in the range 11,352–13,507cm−1 using a Ti:sapphire ring laser. The P-, Q-, and R-branch lines belonging to the v ← v″=(0–7)←(0–7) transition in I35Cl and the v ← v″=(0–6)←(2–6) transition in I37Cl are assigned. Under Doppler-limited conditions, the P- and R-branch lines are split into doublets by the nuclear quadrupole coupling effect of the I atom. The unperturbed positions of these lines are correctly calculated, whereas splitting in the Q-branch lines was not observed. The mass-reduced Dunham expansion coefficients U l,m of the A and X states and the spectroscopic constants , and of the A state are determined using a global least-squares fitting procedure. [Copyright &y& Elsevier]

Abstract: Sub-Doppler ro-vibrational spectra of the system of the Cs2 molecule have been measured in the region of 12800–13200cm−1 using a polarization spectroscopic technique. A total of 18000 lines have been assigned in 85 bands. Dunham coefficients Y 00 − Y 30, , , , , and Y 03 − Y 13 of the B state have been determined within a standard deviation of σ =0.0016cm−1. The RKR potential of the B 1Π u state has been calculated from v′=0 to v′=12. [Copyright &y& Elsevier]

The vibrotational absorption spectra of the A←X electronic transition of I79/81Br were measured in the 11 330- to 13 220-cm−1 region using a Ti:sapphire ring laser. The P-, Q-, and R-branch lines of the rotational states from J=10 to 100 belonging to the v′←v″=(3∼20)′,←(1∼6)″ bands were assigned. The P- and R-branch lines, unlike the Q-branch lines, were split into the doublet by the nuclear quadrupole coupling effect of the I atom. The quadrupole coupling constants of eQq0 and eQq2 in the A state were estimated to be −0.030±0.018 and −0.062±0.018 cm−1, respectively, by using the first order perturbation theory. The unperturbed line positions for the rotational lines higher than J=20 were determined. The Dunham coefficients of the X state were determined by the least squares fitting method using the pseudo vibrotational transition wavenumbers obtained by calculating the combination differences between the electronic spectral lines assigned and the far infrared vibrotational lines reported by Nelander et al. (7). The spectroscopic constants of Tv′, Bv′, Dv′, and Hv′ of the A state were determined suitable for the vibrational states from v′=3 to 20 by using a least squares fitting procedure. [Copyright &y& Elsevier]