THE HYDRODYNAMIC EXPANSION OF REFRACTORY MATERIALS CHARACTERIZED BY LASER SPECTROSCOPY-METALLIC SODIUM

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1980

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Ohio State University

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Sodium has been expanded hydrodynamically over an over temperature range $800-1150^{\circ} K$ . The products of expansion are characterized using laser induced excitation and photoluminescence spectroscopy covering a spectral range 4200-6600 {\AA} in an attempt to excite emission from polymeric sodium clusters. The success of this effort will be discussed. Laser induced atomic fluorescence (D-line emission) has been found to accompany the formation of sodium cluster. The emission onsets when the laser is operative $\sim400$ $cm^{-1}$ to the blue of the Na D line components and continues as the laser is tuned to higher frequency. The intensity of the atomic fluorescence varies as the frequency of the dye laser is scanned, producing a series of fluctuation bands. The structured atomic fluorescence features emanate primarily from the $^{2}P_{3/2}$ component of the Na D line with a considerably smaller component of fluorescence from $^{2}P_{1/2}$ Mass spectrometric studies demonstrate that the structured atomic fluorescence corresponding to $^{3}P_{3/2}$ emission may he correlated with $Na_{3}$. It appears that we have observed the pohotodecomposition of $Na_{3}$ via excitation from a shallow low-lying excited or ground electronic state. The peaks observed in the fluctuation spectrum are correlated with discrete lower states and repulsive excited states. These studies are discussed in the light of recent experimental and $theoretical^{2}$ characterizations of $Na_{3}$.

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$^{1}$ A. Herrmann, M. Hofmann, S. Leutwyler, E. Schumacher, and L. W\""oste, Chem. Phys. Lett. 62, 216 (1979). $^{2}$ R. L. Martin and E. R. Davidson, Mol. Phys. 35, 1713 (1978).
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