OPTOGALVANIC SPECTROSCOPY WITH TUNABLE INFRARED $LASERS^{*}$
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Date
1981
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Ohio State University
Abstract
Using an F-center laser and the technique of optogalvanic detection we have observed transitions among low-lying Rydberg states of lithium, neon and argon in hollow cathode discharges in the region from $2600-4000 cm^{-1}$. Most of the fifty-one observed lines in neon, the single lithium transition and the fifty-two observed lines in argon have been assigned. The transitions in neon occur among the $4s\rightarrow 4p, 4p\rightarrow 4d, 4d \rightarrow 4f$ and $5s\rightarrow 6p$ arrays and those of argon between the $3d \rightarrow 5p ,5s\rightarrow 5p$ and $5p \rightarrow 5d$ arrays while that in lithium is the $3s \rightarrow 3p$ transition. The high signal to noise ratios we have observed indicate the potential of this technique for studying excited species in discharges and point to the possibility of employing it for the study of highly excited molecules.
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$^{*}$ Supported by NSF Grant $\#CHE-8007042$.
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