The photo-electron spectrum of XeF<sub>2</sub>

Brehm, B.; Menzinger, Michael; Zorn, Christian

doi:10.1139/v70-537

Cited by 15 publications

(2 citation statements)

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“…The sign of /lo is uniquely specified by the sign of r/. 18 Our results are quantitatively high by a factor of 2. 4 indicates that -ao/a starts out at 0 for y=O, goes through a maximum, and then turns downward toward the density axis and crosses it at about the point where the "freezi'ng" phenomenon (described above) sets in for each b tested.…”

Section: Resultsmentioning

confidence: 50%

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Radial Distribution Functions and Superficial Quantities for Rigid Sphere Fluids; Method of “Point” Chemical Potential Using Scaled Particle Theory

Harris¹,

Tully‐Smith²

1971

The Journal of Chemical Physics

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The radial distribution of rigid spheres of diameter a about a single fixed solute rigid sphere of diameter b was calculated using the method of "point" chemical potential and effective local density, together with results from the scaled particle theory of rigid sphere fluids. This method, which avoids the superposition approximation, gives rise to a nonlinear integral equation which was solved numerically for various values of b in the interval a ~b< (Xl and for intermediate fluid densities. An apparent freezing transition was observed; the density required for this transition was a minimum for b= (Xl and increased as b was decreased.The superficial density of matter referred to the surface of radius r= (a+b) /2, rr*, was found, using these distribution functions, to be small and positive. Knowledge of rr* allowed the unambiguous location of the equimolecular Gibbs dividing surface. 16 B.

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Section: Resultsmentioning

confidence: 50%

“…with the approximation(18) in Eq. (29) and do the integration over ~ in a fashion entirely analogous to the homogeneous case, Eq.…”

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confidence: 99%

Radial Distribution Functions and Superficial Quantities for Rigid Sphere Fluids; Method of “Point” Chemical Potential Using Scaled Particle Theory

Harris¹,

Tully‐Smith²

1971

The Journal of Chemical Physics

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Halogen‐Austausch‐Reaktionen in Molekularstrahlen

Loesch

Beck

1971

Ber Bunsenges Phys Chem

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Fur die exothermen Halogenaustausch-Reaktionen CI + Br,, J,, BrJ (beide Kanlle) und Br + J2 wurden Winkelverteilungen der molekularen Reaktionsprodukte gemessen. Fur C1 + J2 wurde bei den Labor-Winkeln @ = lo", 30" und 60" auch die Produktgeschwindigkeitsverteilung bestimmt. Die Analyse dieser Daten zeigt: a) betrachtliche Bruchteile direkter, im Massenmittelpunktsystem nach uorn streuender Prozesse bei CI + BrZ, J, und BrJ(-. ClBr + J), erhohte Ruckwlrtsintensitat bei Br + J2 und nahezu vorwarts-ruckwarts symmetrische Streuung bei C1 + JBr + CIJ + Br, was auf eine Verschiedenheit der Reaktionszeit bei diesen Systemen hindeutet; b) eine Bevorzugung der inneren Freiheitsgrade im Energiehaushalt aller Reaktionen; c) Aktivierungsenergien E, 6 1 kcal/mol fur die direkten Reaktionen; d) integrale Reaktionsquerschnitte betrachtlich kleiner als die gaskinetischen, wodurch eine starke sterische Behinderung der Reaktionen nahegelegt ist. Diese Resultate werden mit BEBO-Potentialen verglichen. Es wird darauf hingewiesen, daB neben der Feinstruktur der Potentialfllchen bei 3-Halogen-Atom-Systemen eine zusatzliche Entartung wahrscheinlich ist.Angular product distributions have been measured for the exothermic halogen exchange rections CI + Br,, J2, BrJ (both channels), and Br + J,. For CI + J2 product velocity distributions at LS angles 0 = lo", 30" and 60" have also been determined. Analysis shows: a) substantial fractions of direct CMSjorward scattering events for C1 + Br,, J2 and BrJ(-+ClBr + J), increased backward intensity for Br + J , . and nearly forward-backward symmetric scattering for CI + JBr (+ CIJ + Br), thus indicating a variation of reaction time for these systems, b) energy partitioning favouring the internal product degrees of freedom, c) activation energies E, 5 1 kcal/mol for the direct reactions, d) integral reaction cross sections considerably smaller than gas kinetic cross sections suggesting severe steric hindrance. These results are compared to BEBO potentials of the reactions. A probable degeneracy, other than fine structure, of 3 halogen atom potential surfaces is pointed out.

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