Results 211 to 220 of about 2,396 (263)

Kinetics of condensation in supersonic expansion (Ar)

The Journal of Chemical Physics, 1986
The temperature and density in an overexpanded jet (Ar) were mapped by the method of characteristics. The kinetics of condensation in the supersaturated gas along the central streamline was analyzed on the basis of four models, subject to previously developed thermodynamic relations which must apply during the homogeneous condensation of any ...
S. H. Bauer, N.-S. Chiu, C. F. Wilcox
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FTIR spectrum of benzene in a supersonic expansion

Chemical Physics Letters, 1984
Abstract The 700 and 3050 cm−1 region of benzene seeded in argon is studied using Fourier-transform infrared absorption spectroscopy. Analysis of the sequence band structure in the 700 cm−1 region gave new anharmonic constants and values of Trot (79 ± 15 K) and Tvib (/2~160 K) which indicate a disequilibrium between the rotational and vibrational ...
Snavely, D. L., Walters, V., Colson, S. D., Wiberg, K. B.   +3 more
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Pulsed supersonic expansion of nonvolatile solids

Review of Scientific Instruments, 2004
A compact apparatus for transferring nonvolatile particles into the gas phase and depositing them on a solid surface has been built and tested successfully. As initial experiment, solid caffeine with a vanishingly low vapor pressure has been dissolved in supercritical carbon dioxide, expanded into vacuum using a pulsed, supersonic molecular beam, and ...
Wolfgang Christen, Stephanie Geggier, Svitlana Grigorenko, Klaus Rademann   +3 more
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Emission spectrum of SO+ in a supersonic expansion

Annual Meeting Optical Society of America, 1986
Using a supersonic expansion of helium and sulfur dioxide excited by a corona discharge, we have observed spectra of the A–X band system of the thionyl ion, SO+, in emission between 255 and 450 nm. The spectra are rotationally and spin-orbit cooled by the expansion, allowing features which ordinarily are highly congested to be analyzed rotationally ...
J. L. Hardwick, J. T. Moseley, I. W. Milkman, J. C. Choi   +3 more
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Condensation limited cooling in supersonic expansions

The Journal of Chemical Physics, 2003
Supersonic expansions of pure and seeded rare gases have been investigated experimentally, measuring the translational and rotational temperatures. The lowest achievable translational temperature in the jet depends on both gas properties as well as on experimental boundary conditions like nozzle shape and nozzle–skimmer distance.
Matthias Hillenkamp, Sharon Keinan, Uzi Even   +2 more
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Supersonic jet expansions in analytical spectroscopy

TrAC Trends in Analytical Chemistry, 1984
Abstract Supersonic jet expansions allow gas phase molecules to be cooled to very low temperatures without condensation. At these temperatures, electronic absorption and emission spectra consist of sharp lines rather than broad bands. The narrow bandwidth character of the spectra provides a highly selective method for the detection of individual ...
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Irregular Shapes of Water Clusters Generated in Supersonic Expansions

Physical Review Letters, 2014
We report cross sections for pickup of guest molecules on neutral argon and water clusters with the mean sizes in the range from N = 50 to 600. The experiments are supported by molecular dynamics simulations and analytical models based on the interaction potentials. The cross sections for argon clusters are consistent with their assumed spherical shape
Lengyel J, Pysanenko A, Poterya V, Slavíček P, Fárník M, Kočišek J, Fedor J   +6 more
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The Rapid Expansion of a Turbulent Boundary Layer In A Supersonic Flow

Theoretical and Computational Fluid Dynamics, 1991
Rapid distortion approximations (RDA) may be used to simplify the Reynolds Stress equations under the satisfaction of rapid distortion criteria as suggested by Dussauge and Gaviglio (1987). The evolution of Reynolds stresses along streamlines in a boundary layer may then be calculated.
Douglas R. Smith, Alexander J. Smits
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Spectroscopy of the fluorene molecule in planar supersonic expansions

Chemical Physics, 1982
Abstract In this paper we report on the energetics and the vibrational structure of the lowest S 0 →S 1 , spin-allowed electronic transition of fluorene (C 13 H 10 ) cooled in pulsed, planar, supersonic expansions of Ar (12 Hz, 150 μs duration for jets expanded through a 35 mm long slit), and interrogated by laser-induced fluorescence. Information on
A. Amirav, U. Even, Joshua Jortner
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Modelling of a supersonic ICP argon–hydrogen expansion

Plasma Sources Science and Technology, 2003
An expanding argon–hydrogen plasma is investigated by means of simulations. The model is a hydrodynamical model specific for plasma expansions, taking into account the conservation laws of mass, momentum and energy. The code includes the Rankine–Hugoniot relations to calculate shock jump conditions.
K T A L Burm, B Jodoin, P Proulx, M I Boulos   +3 more
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