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

Journal Article · Thu Apr 15 04:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.81.042509· OSTI ID:21408598

Kruzins, A; Klincare, I; Nikolayeva, O; Tamanis, M; Ferber, R; Pazyuk, E A; Stolyarov, A V ^[1]

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1. Laser Center, University of Latvia, Rainis Boulevard 19, LV-1586 Riga (Latvia)

The laser-induced fluorescence (LIF) A {sup 1{Sigma}+}-b {sup 3{Pi}{yields}}X {sup 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{sup -1}. Overall more than 200 collisionally enhanced LIF spectra were rotationally assigned to {sup 39}K{sup 133}Cs and {sup 41}K{sup 133}Cs isotopomers yielding more than 3400 rovibronic term values of the strongly mixed singlet A {sup 1{Sigma}+} and triplet b {sup 3{Pi}} states with the uncertainty of 0.003-0.01 cm{sup -1}. Experimental data massive starts from the lowest vibrational level v{sub A}=0 of the singlet and nonuniformly covers the energy range E is an element of [10 040,13 250] cm{sup -1} with rotational quantum numbers J{sup '} is an element of [7,225]. Besides the dominating regular A {sup 1{Sigma}+}-b {sup 3{Pi}}{sub {Omega}=0} interactions, the weak local heterogeneous A {sup 1{Sigma}+}-b {sup 3{Pi}}{sub {Omega}=1} perturbations have been discovered and analyzed. Coupled-channels deperturbation analysis of the experimental {sup 39}K{sup 133}Cs e-parity term values of the A {sup 1{Sigma}+}-b {sup 3{Pi}}{sub {Omega}=0,1,2} complex was accomplished in the framework of the phenomenological 4x4 Hamiltonian accounting implicitly for regular interactions with the remote {sup 1{Pi}} and {sup 3{Sigma}+} states. The diabatic potential energy curves of the A {sup 1{Sigma}+} and b {sup 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 {sup 39}K{sup 133}Cs isotopomer with a standard deviation of 0.004 cm{sup -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 {sup 41}K{sup 133}Cs isotopomer. The calculated relative intensity distributions in A-b{yields}X LIF progressions are also consistent with their experimental counterparts. The deperturbation model was applied for simulation of a pump-dump optical cycle a {sup 3{Sigma}+{yields}}A {sup 1{Sigma}+}-b {sup 3{Pi}{yields}}X {sup 1{Sigma}+} proposed for transformation of ultracold KCs molecules to their absolute ground state v{sub X}=0;J{sub X}=0.

• OSTI ID: 21408598
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 4 Vol. 81; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
COUPLED CHANNEL THEORY
COUPLING
DIAGRAMS
ELECTRONIC EQUIPMENT
EMISSION
ENERGY
ENERGY LEVELS
EQUIPMENT
FLUORESCENCE
FOURIER TRANSFORM SPECTROMETERS
FOURIER TRANSFORMATION
GROUND STATES
HAMILTONIANS
INFORMATION
INTEGRAL TRANSFORMATIONS
INTERMEDIATE COUPLING
L-S COUPLING
LUMINESCENCE
MATHEMATICAL OPERATORS
MATRIX ELEMENTS
MEASURING INSTRUMENTS
MOLECULES
OSCILLATORS
PARITY
PARTICLE PROPERTIES
PHOTON EMISSION
POTENTIAL ENERGY
QUANTUM NUMBERS
QUANTUM OPERATORS
SPECTRA
SPECTROMETERS
SPECTROSCOPY
TRANSFORMATIONS