OSU Navigation Bar

The Ohio State University University Libraries Knowledge Bank

WATER COLLISIONS WITH NORMAL AND PARAHYDROGEN

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/49483

Show full item record

Files Size Format View
abstract.gif 67.63Kb GIF image Thumbnail of WATER COLLISIONS WITH NORMAL AND PARAHYDROGEN
TF13_2011_water_collisions.pptx 1.137Mb Microsoft PowerPoint 2007 View/Open
Slide1.GIF 85.23Kb GIF image Thumbnail of WATER COLLISIONS WITH NORMAL AND PARAHYDROGEN
Slide2.GIF 57.26Kb GIF image Thumbnail of WATER COLLISIONS WITH NORMAL AND PARAHYDROGEN
Slide3.GIF 73.19Kb GIF image Thumbnail of WATER COLLISIONS WITH NORMAL AND PARAHYDROGEN
Slide4.GIF 65.14Kb GIF image Thumbnail of WATER COLLISIONS WITH NORMAL AND PARAHYDROGEN
Slide5.GIF 43.89Kb GIF image Thumbnail of WATER COLLISIONS WITH NORMAL AND PARAHYDROGEN
Slide6.GIF 31.51Kb GIF image Thumbnail of WATER COLLISIONS WITH NORMAL AND PARAHYDROGEN
Slide7.GIF 41.97Kb GIF image Thumbnail of WATER COLLISIONS WITH NORMAL AND PARAHYDROGEN
Slide8.GIF 32.00Kb GIF image Thumbnail of WATER COLLISIONS WITH NORMAL AND PARAHYDROGEN
Slide9.GIF 29.51Kb GIF image Thumbnail of WATER COLLISIONS WITH NORMAL AND PARAHYDROGEN
Slide10.GIF 24.29Kb GIF image Thumbnail of WATER COLLISIONS WITH NORMAL AND PARAHYDROGEN
Slide11.GIF 21.08Kb GIF image Thumbnail of WATER COLLISIONS WITH NORMAL AND PARAHYDROGEN
Slide12.GIF 25.52Kb GIF image Thumbnail of WATER COLLISIONS WITH NORMAL AND PARAHYDROGEN

Title: WATER COLLISIONS WITH NORMAL AND PARAHYDROGEN
Creators: Drouin, Brian J.; Pearson, John C.; Wiesenfeld, Laurent; Faure, Alexandre
Issue Date: 2011
Abstract: Previous pressure broadening results for the normal hydrogen/water system displayed a dramatic reduction in the broadening at low temperature. Theoretical predictions, the basis for which are calculated collisional excitation rates, indicated stronger excitation, with a steady increase in the broadening as the temperature drops. Due to this disagreement, concerns were raised about the stability of the the ortho/para hydrogen ratio (OPR) in the apparatus$^1$. The development of a modified injector, as well as improved optics and a parahydrogen generator, have enabled these concerns to be thoroughly investigated for the 556 GHz transition of water. The modified injector has been shown to eliminate the bias between gas and cell temperature. The improved optics allow much better signal-to-noise ratios with smaller amounts of water. Furthermore, a reduction of water injected into the system was found to be critical to stabilize the OPR, which was verified to be dependent upon several system variables. Preparation of parahydrogen in an exterior vessel was useful for testing the OPR stability and full data sets of both parahydrogen and normal hydrogen water broadening at 556 GHz have been collected. The newest results show good qualitative agreement with theory, with the dramatic decreases of broadening at low temperature no longer evident. Other water transitions near 1 THz are also under investigation. We will discuss the new experimental procedures, the experimental results and compare with recent theoretical work. \\ \\ $^1$ A.F. Krupnov, Phys. Rev. A 82(3) 036703, 2010.
URI: http://hdl.handle.net/1811/49483
Other Identifiers: 2011-TF-13
Bookmark and Share