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4 Optica Applicata

4 2006

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The 61Π u state of Na2 molecule

Grochola A., Kubkowska M. K., Jastrzębski W., Kowalczyk P.

Optica Applicata

2006

Vol. 36, nr 4

s. 469--473

Excitation spectra of sodium dimer were analysed within the range 34200–36400 cm–1. The experiment was done using polarisation labelling spectroscopy technique. In the spectral region under investigation we found several vibrational progressions belonging to a single band system having the ground state of Na2 as the lower state. The upper state was of 1Π u symmetry as indicated by the presence of Q lines in the spectrum and basing on theoretical calculations it was identified as the 61Π u (3s+4f ) state. The Dunham coefficients and potential curve characterising this state were deduced from the observed spectra.

Spectroscopy of Cd2 and Zn2 molecules in free-jet supersonic beams: experimental and theoretical studies

Ruszczak M, Strojecki M, Krośnicki M, Łukomski M, Koperski J

Optica Applicata

2006

Vol. 36, nr 4

s. 451--459

A method of supersonic beam combined with techniques of laser spectroscopy and simulations of spectra were employed to study interatomic potentials of Cd2 and Zn2 molecules. Total laser induced fluorescence was recorded after an excitation of Cd2 using laser radiation in the range of 2200–2260 Å. The observed structures are interpreted as due to the transitions from υ" = 0 in the ground state to vibrational levels below the potential barrier of the 11u(51P1) electronic state. Studies of Zn2 consisted of simulations of excitation and fluorescence spectra recorded at the transition. In the simulations, both isotopic and rotational structures were taken into account.

Investigation of a highly excited electronic 1Π state of NaLi molecule

Bang N. H., Grochola A., Jastrzebski W., Kowalczyk P., Salami H.

Optica Applicata

2006

Vol. 36, nr 4

s. 499--504

We report on our investigation of the excitation spectra of the NaLi molecule in the energy range 31000–33900 cm–1. A polarisation labelling technique is used to ensure rotational resolution of the spectra and to enable unambiguous assignment of the NaLi transitions. A hitherto unknown electronic state of 1Π symmetry is observed. Major molecular constants of the state are determined and its potential curve constructed using the inverted perturbation approach method.

Exotic states of diatomic molecules and methods of their description

Kowalczyk P., Jastrzebski W., Pashov A.

Optica Applicata

2006

Vol. 36, nr 4

s. 511--522

Various methods for representation of electronic states in diatomic molecules basing on experimental spectroscopic data are critically compared. The technique of point wise inverted perturbation approach (IPA) is indicated as the most suitable in case of states characterized by potential energy curves substantially different from the Morse potential. Recent developments of this technique are presented.