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A Study of Perturbations of the A

1

Σ

u+

State of Na

2

Rami Haj Mohamada, Khaled Husseina, and Omar Babakyb

aLebanese University, Faculty of Sciences III, P.O. Box 826, Tripoli, Lebanon

bSana’a University, Faculty of Science, Department of Physics, P. O. Box 13783, Sana’a, Republic of Yemen

Reprint requests to R. H. M.; E-mail: hrami73@hotmail.com Z. Naturforsch. 61a, 349 – 356 (2006); received April 13, 2006

High resolution Fourier spectrometry techniques have been used to study the A1Σ+u state, which is perturbed by the b3∏ustate of the Na2molecule. This study was achieved by means of exciting the B1∏ustate from the X1Σ+g ground state by 4880 ˚A and 4965 ˚A lines of an Ar+laser. The excitation is followed by collisional transfer energy produced between B1∏uand(2)1Σ+g states, which led to the population of the vibrational levels of the(2)1Σ+g state v. The analysis of the collision-induced system(2)1Σ+g −A1Σ+g enabled us to study, in detail, the perturbations of 11 vibrational levels from v=0 to v=10 of the A1Σ+u state.

Key words: Perturbations; Vibrational Levels; Molecular Constants; Excited State A1Σ+u.

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