LASERSPECTROSCOPIC INVESTIGATION OF THE VAN DER WAALS MOLECULE NaKr
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Date
1988
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
The absorption spectrum of NaKr due to the transition $X \Sigma \rightarrow A$ has been investigated in the wavelength region between 16790 and $16950 cm^{-1}$ with high resolution by means of laserspectroscopy using a tunable cw dye laser and producing the molecules by supersonic expansion of a mixture of sodium vapor and krypton gas into a vacuum. In order to get an assignment of rotational quantum numbers to the numerous molecular absorption lines, despite of strong overlapping of vibrational bands and despite of the presence of several Krisotopes, the method of optical-optical double resonance has been applied. In addition, the spectral intensity distribution of the fluorescence light has been investigated, thus allowing an assignment of vibrational quantum numbers. Up to now, the molecular parameters B, D, H of rotation. $A, A_{n}, A_{n}$ of fine structure splitting and p. $p_{n}$ of $\Lambda$-type doubling have been determined with high precision for the vibrational states $8 \leq v^{\prime} \leq 14$ of the $\Pi$ $\Pi$-state and $0 \leq v^{\prime \prime} \leq 2$ for the $X \Sigma$ -state together with the wavenumbers of the band origins ***. The values of the fine structure splitting constants A. decreasing from A = 939 GHz for $v^{\prime} = 8$ to A = 661 GHz for $v^{\prime} = 13$, are unexpectedly high in comparison with the 3P-fine structure splitting of the sodium atom of 517 GHz. The $\lambda$-doubling parameter p decreases with increasing v' and changes sign near $v^{\prime} = 13$. The interatomic potential of the $A \Pi-$ and of the $X \Sigma$-state have been deduced from our data and will be compared to the results of recent model potential calculations.
Description
$^{1}$ Parts of these results have been submitted for publication: E.Zanger, V.Schmatioch, D.Zimmermann, accepted by J.Chem.Phys., to appear in April 88
Author Institution: Institut f\""{u}r Strahlungs- und Kernphysik
Author Institution: Institut f\""{u}r Strahlungs- und Kernphysik