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Study of (3)1Π and (5)1Σ+ states of RbCs based on (3)1Π → (A − b) and (5)1Σ+ → (A − b) Fourier transform spectra analysis

K. Alps, A. Kruzins, О. Nikolayeva, M. Tamanis, R. Ferber, A. V. Stolyarov, E. A. Pazyuk

Published Jan 1, 2015• 0 citations
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Extended Fourier-transform spectroscopy studies and deperturbation analysis of the spin-orbit coupled A1Σ+ and b3Π states in RbCs

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The article presents a study of the strongly spin-orbit coupled singlet A(1)Σ(+) and triplet b(3)Π states of the RbCs molecule, which provide an efficient optical path to transfer ultracold molecules to their rovibrational ground state. Fourier-transform A(1)Σ(+) - b(3)Π → X(1)Σ(+) and (4)(1)Σ(+) → A(1)Σ(+) - b(3)Π laser-induced fluorescence (LIF) spectra were recorded for the natural mixture of the (85)Rb(133)Cs and (87)Rb(133)Cs isotopologues produced in a heat pipe oven. Overall 8730 rovibronic term values of A(1)Σ(+) and b(3)Π states were determined with an uncertainty of 0.01 cm(-1) in the energy range [9012, 14087] cm(-1), covering rotational quantum numbers J ∈ [6, 324]. An energy-based deperturbation analysis performed in the framework of the four A(1)Σ(+) - b(3)Π(Ω = 0, 1, 2) coupled-channels approach reproduces 97% of the experimental term values of both isotopologues with a standard deviation of 0.0036 cm(-1). The reliability of the deperturbed mass-invariant potentials and spin-orbit coupling functions of the interacting A(1)Σ(+) and b(3)Π states is additionally proved by a good reproduction of the A - b → X and (4)(1)Σ(+) → A - b relative intensity distributions. The achieved accuracy of the A - b complex description allowed us to use the latter to assign the observed (5)(1)Σ(+) → A - b and (3)(1)Π → A - b transitions. As is demonstrated, LIF to the A - b complex becomes as informative as to the ground X(1)Σ(+) state, which is confirmed by comparing the results of (4)(1)Σ(+) state analysis based on (4)(1)Σ(+) → A - b LIF with the data from V. Zuters et al. [Phys. Rev. A 87, 022504 (2013)] based on (4)(1)Σ(+) → X LIF.

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Resolution of the Apparent Disorder of the Rb2 A1Σu1(0u+)andb3Πu(0u+) Spectra: A Case of Fully Coupled Electronic States

Claude Amiot, Olivier Dulieu, J. Vergès

Strong perturbation effects in the infrared fluorescence spectra recorded after the resonant excitation process ${X}^{1}{\ensuremath{\Sigma}}_{g}^{+}\ensuremath{\rightarrow}{A}^{1}{\ensuremath{\Sigma}}_{u}^{+}({0}_{u}^{+})\ensuremath{\rightarrow}(2{)}^{1}{\ensuremath{\Pi}}_{g}$ in ${\mathrm{Rb}}_{2}$, have been observed by high resolution Fourier transform spectroscopy. They arise from complete coupling of the two states over the whole range of binding energies, yielding unusual molecular spectra with oscillating vibrational and rotational structures. A quantitative interpretation, based on Fourier grid Hamiltonian method calculations, of these newly observed phenomena is given. This opens new opportunities to study the triplet manifold in ${\mathrm{Rb}}_{2}$, RbCs, and ${\mathrm{Cs}}_{2}$, particularly the lowest state relevant for precise scattering length determination.

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Rovibrattional analysis of the RE2PI (resonance enhanced two-photon ionization) spectrum of the 5 1S+ state in RbCs

Bongsoo Kim

•Nov 1, 1999•0 citations
The article presents a study of the strongly spin-orbit coupled singlet A(1)Σ(+) and triplet b(3)Π states of the RbCs molecule, which provide an efficient optical path to transfer ultracold molecules to their rovibrational ground state. Fourier-transform A(1)Σ(+) - b(3)Π → X(1)Σ(+) and (4)(1)Σ(+) → A(1)Σ(+) - b(3)Π laser-induced fluorescence (LIF) spectra were recorded for the natural mixture of the (85)Rb(133)Cs and (87)Rb(133)Cs isotopologues produced in a heat pipe oven. Overall 8730 rovibronic term values of A(1)Σ(+) and b(3)Π states were determined with an uncertainty of 0.01 cm(-1) in the energy range [9012, 14087] cm(-1), covering rotational quantum numbers J ∈ [6, 324]. An energy-based deperturbation analysis performed in the framework of the four A(1)Σ(+) - b(3)Π(Ω = 0, 1, 2) coupled-channels approach reproduces 97% of the experimental term values of both isotopologues with a standard deviation of 0.0036 cm(-1). The reliability of the deperturbed mass-invariant potentials and spin-orbit coupling functions of the interacting A(1)Σ(+) and b(3)Π states is additionally proved by a good reproduction of the A - b → X and (4)(1)Σ(+) → A - b relative intensity distributions. The achieved accuracy of the A - b complex description allowed us to use the latter to assign the observed (5)(1)Σ(+) → A - b and (3)(1)Π → A - b transitions. As is demonstrated, LIF to the A - b complex becomes as informative as to the ground X(1)Σ(+) state, which is confirmed by comparing the results of (4)(1)Σ(+) state analysis based on (4)(1)Σ(+) → A - b LIF with the data from V. Zuters et al. [Phys. Rev. A 87, 022504 (2013)] based on (4)(1)Σ(+) → X LIF.
Photoassociative Spectroscopy of the (2)3Π^{3}\Pi3Π State in RbCs
Strong perturbation effects in the infrared fluorescence spectra recorded after the resonant excitation process ${X}^{1}{\ensuremath{\Sigma}}_{g}^{+}\ensuremath{\rightarrow}{A}^{1}{\ensuremath{\Sigma}}_{u}^{+}({0}_{u}^{+})\ensuremath{\rightarrow}(2{)}^{1}{\ensuremath{\Pi}}_{g}$ in Rb2{\mathrm{Rb}}_{2}Rb2​, have been observed by high resolution Fourier transform spectroscopy. They arise from complete coupling of the two states over the whole range of binding energies, yielding unusual molecular spectra with oscillating vibrational and rotational structures. A quantitative interpretation, based on Fourier grid Hamiltonian method calculations, of these newly observed phenomena is given. This opens new opportunities to study the triplet manifold in Rb2{\mathrm{Rb}}_{2}Rb2​, RbCs, and Cs2{\mathrm{Cs}}_{2}Cs2​, particularly the lowest state relevant for precise scattering length determination.