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REVISITING THE AMMONIA HYPERFINE STRUCTURE WITH SPFIT

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/46077

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dc.creator Drouin, Brian J. en_US
dc.creator Yu, Shanshan en_US
dc.creator Pearson, John C. en_US
dc.date.accessioned 2010-07-12T13:51:53Z
dc.date.available 2010-07-12T13:51:53Z
dc.date.issued 2010 en_US
dc.identifier 2010-TC-03 en_US
dc.identifier.uri http://hdl.handle.net/1811/46077
dc.description Author Institution: Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109-8099 en_US
dc.description.abstract The definitive ammonia maser measurements of Kukolich$^{1,2}$ have proven to be vastly useful, with over 100 citations to date. A critical review of this work was published shortly afterwards by Hougen$^3$, who made a few corrections and showed that the hyperfine parameters, which were determined separately for each inversion-rotation transition, were internally consistent and useful for extrapolation. In the present work, the multiple-spin fitting routine, SPFIT, has been utilized to perform a global analysis of the available ammonia maser data. Within this framework many of the parameters given by Hougen become redundant, and the differences are introduced as centrifugal distortion corrections to the fundamental spin parameters. The global fit achieves experimental uncertainty for the relative line centers of the hyperfine-split features with 17 independent hyperfine parameters (15 of which are used for both inversion states simultaneously), the previous work had utilized 37 fitted parameters and 10 parameters fixed at assumed values. $^1$ Kukolich S.G., \emph{Phys. Rev.}, 156(1), 83, 1967.\\ $^2$ Kukolich S.G., Wofsy S.C., \emph{J. Chem. Phys.}, 52(10) 5477, 1970. \\ $^3$ Hougen J.T. \emph{J. Chem. Phys.}, 57(10), 4207, 1972. \\ en_US
dc.language.iso en en_US
dc.title REVISITING THE AMMONIA HYPERFINE STRUCTURE WITH SPFIT en_US
dc.type Article en_US
dc.type Image en_US
dc.type Presentation en_US