Short-Range Characterization of the MeAr (Me=Zn, Cd) Ground-State Potentials from Fluorescence Spectra |
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Authors: | J. KoperskiM. Czajkowski |
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Affiliation: | a Instytut Fizyki, Uniwersytet Jagielloński, Reymonta 4, Kraków, 30-059, Polandb Department of Physics, University of Windsor, Windsor, Ontario, N9B 3P4, Canada |
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Abstract: | First-time observed D1(1Π)v′=10→X0+(1Σ) fluorescence in ZnAr, and A0+(3Π)v′=4→X0+ and D1(1Π)v′=7,8→X0+ fluorescence in CdAr van der Waals (vdW) molecules were produced in a continuous supersonic molecular beam crossed with a pulsed dye-laser beam, following excitation of single vibronic levels. The dispersed fluorescence spectra displayed characteristic Condon internal diffraction (CID) patterns consisting of bound-free, reflection type, continuous spectra, and, in certain cases, bound-bound discrete features. An analysis of the A0+→X0+ and D1→X0+ bound-bound spectra indicates that Morse functions are adequate representations of the X0+ potential energy (PE) curves below their dissociation limits. In simulation of the A0+→X0+ and D1→X0+ bound-free spectra, the Morse, Lennard-Jones L-J(n−6), and Maitland-Smith M-S(n0,n1) functions were tested, and the respective M-S(11.3, 9.0) and M-S(10.6, 7.0) potentials were found to be good representations for the repulsive walls of the X0+ PE curves of ZnAr and CdAr, respectively, over the short range, R=2.45-4.38 Å (ZnAr) and R=2.85-4.31 Å (CdAr), of internuclear separations. |
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Keywords: | supersonic-expansion-beam method |
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