Fourier-transform spectroscopy and coupled-channels deperturbation treatment of the A(1)Sigma(+)-b(3)Pi complex of KCs

Kruzins, A.; Klincare, I.; Nikolayeva, O.; Tamanis, M.; Ferber, R.; Pazyuk, E.A.; Stolyarov, A.V.

Авторы: Kruzins A., Klincare I., Nikolayeva O., Tamanis M., Ferber R., Pazyuk E.A., Stolyarov A.V.
Журнал: Physical Review A - Atomic, Molecular, and Optical Physics
Том: 81
Номер: 4
Год издания: 2010
Издательство: American Physical Society
Местоположение издательства: United States
Первая страница: 042509
DOI: 10.1103/PhysRevA.81.042509
Аннотация: The laser-induced fluorescence (LIF) A(1)Sigma(+)-b(3)Pi -> X-1 Sigma(+) spectra of the KCs molecule were recorded in a near infrared region by a Fourier-transform spectrometer with a resolution of 0.03 cm(-1). Overall more than 200 collisionally enhanced LIF spectra were rotationally assigned to (KCs)-K-39-Cs-133 and (KCs)-K-41-Cs-133 isotopomers yielding more than 3400 rovibronic term values of the strongly mixed singlet A(1)Sigma(+) and triplet b(3)Pi states with the uncertainty of 0.003-0.01 cm(-1). Experimental data massive starts from the lowest vibrational level upsilon(A) = 0 of the singlet and nonuniformly covers the energy range E is an element of [10 040, 13 250] cm(-1) with rotational quantum numbers J’ is an element of [7, 225]. Besides the dominating regular A(1)Sigma(+)-b(3)Pi(Omega=0) interactions, the weak local heterogeneous A(1)Sigma(+)-b(3)Pi(Omega=1) perturbations have been discovered and analyzed. Coupled-channels deperturbation analysis of the experimental (KCs)-K-39-Cs-133 e-parity term values of the A(1)Sigma(+)-b(3)Pi(Omega=0,1,2) complex was accomplished in the framework of the phenomenological 4 x 4 Hamiltonian accounting implicitly for regular interactions with the remote (1)Pi and (3)Sigma(+) states. The diabatic potential energy curves of the A(1)Sigma(+) and b(3)Pi states, as well as relevant spin-orbit coupling matrix elements, were defined analytically with the expanded Morse oscillators model. The obtained parameters reproduce 95% of experimental data field of the (KCs)-K-39-Cs-133 isotopomer with a standard deviation of 0.004 cm(-1), which is consistent with the uncertainty of the experiment. Reliability of the derived parameters was confirmed by a good agreement between the predicted and experimental term values of the (KCs)-K-41-Cs-133 isotopomer. The calculated relative intensity distributions in A-b -> X LIF progressions are also consistent with their experimental counterparts. The deperturbation model was applied for simulation of a pump-dump optical cycle a(3)Sigma(+) -> A(1)Sigma(+)-b(3)Pi -> X-1 Sigma(+) proposed for transformation of ultracold KCs molecules to their absolute ground state upsilon(X) = 0; J(X) = 0.
Добавил в систему: Столяров Андрей Владиславович

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Fourier-transform spectroscopy and coupled-channels deperturbation treatment of the A(1)Sigma(+)-b(3)Pi complex of KCsстатья

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