Electron diffraction studies of laser‐pumped molecules. IV. SF6, experiment and theory
dc.contributor.author | Bartell, Lawrence S. | en_US |
dc.contributor.author | Kacner, Michael A. | en_US |
dc.date.accessioned | 2010-05-06T21:22:46Z | |
dc.date.available | 2010-05-06T21:22:46Z | |
dc.date.issued | 1984-07-01 | en_US |
dc.identifier.citation | Bartell, Lawrence S.; Kacner, Michael A. (1984). "Electron diffraction studies of laser‐pumped molecules. IV. SF6, experiment and theory." The Journal of Chemical Physics 81(1): 280-287. <http://hdl.handle.net/2027.42/69936> | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/69936 | |
dc.description.abstract | A model of absorption of infrared radiation by supersonic jets proposed in paper III was tested experimentally. New nozzle designs permitted pumping the ν3 mode of SF6 at power densities in excess of 104 W/cm2. Vibrational excitation corresponding to the absorption of up to 3.6 photons/molecule was deduced from the increased amplitudes of vibration of the SF, FFcis, and FFtrans atom pairs and the lengthening of the SF bond. At high excitations, electron diffraction intensities were accounted for best if it was assumed that two subsets of molecules were produced, one much hotter than the other. Vibration–vibration relaxation from ν3 to the other stretching modes was too fast to be followed. Relaxation of stretching to bending could be monitored, crudely, at lower pressures where approximately 30 collisions were needed at the depressed temperatures in the jet. At higher pressures and excitations V‐T/R relaxation was observed, corresponding to a transfer of perhaps one‐tenth of the vibrational excitation in the course of 103 collisions. Excitation as a function of gas density, power density, and nozzle diameter was accounted for satisfactorily by the model of paper III. | en_US |
dc.format.extent | 3102 bytes | |
dc.format.extent | 661856 bytes | |
dc.format.mimetype | text/plain | |
dc.format.mimetype | application/pdf | |
dc.publisher | The American Institute of Physics | en_US |
dc.rights | © The American Institute of Physics | en_US |
dc.title | Electron diffraction studies of laser‐pumped molecules. IV. SF6, experiment and theory | en_US |
dc.type | Article | en_US |
dc.subject.hlbsecondlevel | Physics | en_US |
dc.subject.hlbtoplevel | Science | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109 | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/69936/2/JCPSA6-81-1-280-1.pdf | |
dc.identifier.doi | 10.1063/1.447382 | en_US |
dc.identifier.source | The Journal of Chemical Physics | en_US |
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dc.identifier.citedreference | See AIP document No. PAPS JCPSA‐81‐280‐18 for 18 pages of experimental conditions for all diffraction plates, analyses of the plates, representative experimental intensities, and the nozzles as a function of stagnation pressure. Order by PAPS number and journal reference from American Institute of Physics, Physics Auxilliary Publication Service, 335 E. 45 St., New York, NY 10017. The price is $1.50 for each microfiche (98 pages) or $5 for photocopies of up to 30 pages and $0.15 for each page over 30 pages. Airmail is additional. Make checks payable to the American Institute of Physics. | en_US |
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dc.identifier.citedreference | Inasmuch as the absorption takes place in the first nozzle diameter or so of the jet flow, it is only necessary that the breadth of the polished region responsible for reflections be large compared with the 102μ m102μm span of the jet orifice. | en_US |
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dc.owningcollname | Physics, Department of |
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