Electronic Spectra for the Ne OH and Ne OD van der Waals Complexes
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Date
1990
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Ohio State University
Abstract
Laser induced fluoresecnce spectra have been recorded for the $A^{2} \Sigma^{+} -X^{2}\Pi_{3/2}$ systems of Ne-OH and Ne-OD. Bands of the complexes were observed in conjunction with excitation of the OH/D 1-0 and 0-0 transitions. All of the band originated from the ground state zero point level. Ground state rotational constants of $B_{0}=0.130 \pm 0.003$ and $0.127 \pm 0.003 cm$ were found for the H and D isotopes, respectively. Bands corresponding to excitation of the van der Waals stretch and bend stretch combinations in the $A^{2} \Sigma^{+}$ slate were seen. The energy ranges encompassed by these features provided lower limits for the van der Waals dissociation energies of $D^{\prime}_{0}>61.8cm^{-1}(Ne-OH(A))$ and $68.5 cm^{-1}(Ne-OD(A))$. Analysis of the vibronic structure, based on ab - intio potential energy surfaces for the upper and lower electronic states, is in progress. Prelimentry results indicate that NeOH(X) executes an almost free internal rotation. As a consequence, the LIF spectrum probes a large fraction of the excited state surface. Details of the experiment and analysis will be presented
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$^{1}$ L. Harding- private communication Work supported by AFOSR under grant 88-0249
Author Institution: Departments of Chemistry, Emory University
Author Institution: Departments of Chemistry, Emory University