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dc.creatorTanaka, Takehikoen_US
dc.creatorField, R. W.en_US
dc.creatorHarris, David O.en_US
dc.date.accessioned2006-06-15T17:09:30Z
dc.date.available2006-06-15T17:09:30Z
dc.date.issued1974en_US
dc.identifier1974-FA-6en_US
dc.identifier.urihttp://hdl.handle.net/1811/16224
dc.descriptionThis work was supported, in part, by the National Science Foundation Grant No. GP-35672X.en_US
dc.descriptionAuthor Institution: Quantum Institute, University of Californiaen_US
dc.description.abstractA single frequency, cw, rhodamine 6G dye laser pumps one of four optical transitions of $NO_{2}$ near 593.6 nm which have been assigned by Tanaka, et al. [j. Chem. Phys. \underline{59}, 5217 (1973)] by excitation spectroscopy and ground state MODR. The upper levels of these optical transitions are 9$_{09}$, J = 17/2 and 19/2, and $8_{18}$, J = 15/2 and 17/2 which belong to an as yet unassigned vibrational level of the $^{2}B_{2}$ electronic state. Microwave transitions originating from the optically populated excited levels are detected as changes (0.5 – 7\%) in the photoluminescence intensity monitored through a short wavelength cut off filter. Various spin and hyperfine components of the $9_{09} - 8_{18}$ rotational transition within the $NO_{2}$ $^{2}B_{2}$ electronic state are observed and assigned. Hyperfine splittings In the $^{2}B_{2}$ state are of the same order of magnitude as in the ground state. The MODR signal for $9_{9}$ - $8_{18}$ transitions has an unusual pressure dependence. If the $9_{09}$ level is optically pumped, the HOPR signal is an increase of photoluminescence near 1 mTorr, but is a decrease near 10 mTorr. However, if the $8_{18}$ level is pumped, the MODR signal always corresponds to an increase of photoluminescence. In addition to $9_{09} - 8_{18}$ transitions, ``mystery” microwave transitions are observed from $9_{09}$ or $8_{18}$ levels to unknown levels which belong to another vibronic state. Mystery transitions are observed as n decrease in photoluminescence intensity. Pressure dependent MODR effects and mystery transitions are explained by an electronic perturbation which affects the $8_{18}$ level more strongly than $9_{09}$.en_US
dc.format.extent285155 bytes
dc.format.mimetypeimage/jpeg
dc.language.isoEnglishen_US
dc.publisherOhio State Universityen_US
dc.titleMICROWAVE OPTICAL DOUBLE RESONANCE OF $NO_{2}$ WITH A CW DYE LASER. EXCITED STATE MICROWAVE TRANSITIONSen_US
dc.typearticleen_US


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