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dc.creatorMuenchausen, R. E.en_US
dc.creatorHills, G. W.en_US
dc.descriptionAuthor Institution: Department of Chemistry, 27514 University of North Carolina Chapelen_US
dc.description.abstractThis preliminary work demonstrates the utility of the infra red optical double resonance technique (IODR) in the investigation of the optical absorption spectrum of $ND_{2}$ in the region $5400-6250 {\AA}$. A $CO_{2}$ gas infra red laser pumped ortho rotational transitions within $\tilde{X}^{2}B_{1}, 5_{05}-5_{14}, F_{1}-F_{1}$ and $2_{12}-2_{21}, F_{2}-F_{2}$ in the $\nu_{2}$ band using the $^{12}C^{18} O_{2}P(10)$ line at $1076.578 cm^{-1}$ and $^{12}C^{16}O_{2} R(26)$ line at $1082.302cm^{-1}$ respectively. A counter-propagating CW dye laser was tuned through bands of the $\tilde{A}^{2}A_{1}\leftarrow\tilde{X}^{2}B_{1}$, visible system and the IODR signals were detected as changes in the fluorescence at the IR chopping Frequency. IODR signals corresponding to decreases in fluorescence were observed for optical transitions from both directly pumped (3-level) and collisionally linked (4-level) ortho rotational levels in $\tilde{X} (0,0,0)$. Increased fluoresence IODR signals were also observed in both 3-and 4- level schemes for optical transitions involving ortho rotational levels in $\tilde{X} (0,1,0)$. In addition to simplification of the optical spectrum, which facilitates assignments, observation of IODR signals was used to investigate a perturbation involving the $1_{11}\Pi (0,12,0)$ level by accurately locating the perturbing level. This study illustrates how the specificity of the IODR technique, in selecting a particular rotational level within a dense manifold of levels, can be utilized. $^{*}$Research supported by the National Science Foundation under grant CHE-8111131en_US
dc.format.extent125126 bytes
dc.publisherOhio State Universityen_US

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