Short-Range Characterization of the MeAr (Me=Zn, Cd) Ground-State Potentials from Fluorescence Spectra
✍ Scribed by J. Koperski; M. Czajkowski
- Publisher
- Elsevier Science
- Year
- 2002
- Tongue
- English
- Weight
- 249 KB
- Volume
- 212
- Category
- Article
- ISSN
- 0022-2852
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✦ Synopsis
First-time observed D1( 1 ) v =10 → X 0 + ( 1 ) fluorescence in ZnAr, and A0 + ( 3 ) v =4 → X 0 + and D1( 1 ) v =7,8 → X 0 + 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 + → X 0 + and D1 → X 0 + bound-bound spectra indicates that Morse functions are adequate representations of the X 0 + potential energy (PE) curves below their dissociation limits. In simulation of the A0 + → X 0 + and D1 → X 0 + bound-free spectra, the Morse, Lennard-Jones L-J(n -6), and Maitland-Smith M-S(n 0 , n 1 ) 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 X 0 + 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.