scholarly journals Reactive Scattering of Oxygen Atoms With Iodine Molecules

1988 ◽  
Vol 9 (4-6) ◽  
pp. 277-288 ◽  
Author(s):  
N. C. Firth ◽  
N. W. Keane ◽  
D. J. Smith ◽  
R. Grice
Keyword(s):  
Differential Cross Section ◽  
Energy Distribution ◽  
Cross Section ◽  
Cross Correlation ◽  
Minor Component ◽  
Translational Energy ◽  
Reactive Scattering ◽  
Centre Of Mass ◽  
A Minor ◽  
Forward Hemisphere

Reactive scattering of O atoms with I2 molecules has been studied at an initial translational energy E~43 kJ mol−1 using cross-correlation time-of-flight analysis with resolution improved overprevious measurements. The broad centre-of-mass differential cross section favours the backward hemisphere with a product translational energy distribution lying above the distribution observed at lower initial translational energy but below the microcannonical RRHO distribution. However, a minor component with very low product translational energy favours the forward hemisphere. The observed scattering is attributed to a strongly bent OII triplet complex intermediate with a lifetime shorter than the period of overall rotation of the axis of the heavy II diatomic but long compared with the period of vibrational and rotational motion of the light O atom.

scholarly journals Reactive Scattering of Oxygen Atoms With Bromine Molecules

1988 ◽  
Vol 9 (4-6) ◽  
pp. 265-276 ◽  
Author(s):  
N. C. Firth ◽  
N. W. Keane ◽  
D. J. Smith ◽  
R. Grice
Keyword(s):  
Angular Distribution ◽  
Differential Cross Section ◽  
Cross Section ◽  
Differential Cross ◽  
Rotational Motion ◽  
Correlation Time ◽  
Cross Correlation ◽  
Translational Energy ◽  
Reactive Scattering ◽  
Centre Of Mass

Reactive scattering of O atoms with Br2 molecules has been studied at an initial translational energy E~35 kJ mol−1 using cross-correlation time-of-flight analysis with resolution improved over previous measurements. The centre-of-mass differential cross section peaks in the forward and backward directions with a higher product translational energy for backward Scattering. The angular distribution traced at the peak of the product velocity distribution peaks more sharply in the forward than the backward direction but the angular distribution of product flux shows a distribution which is more nearly symmetrical about θ = 90°. The observed scattering is attributed to a triplet OBrBr complex intermediate with a lifetime which is shorter than the period of overall rotation of the axis of the heavy BrBr diatomic but which is long compared with the period of vibrational and rotational motion of the light O atom.

scholarly journals Neutron-proton scattering at 156±3 MeV

1952 ◽  
Vol 213 (1114) ◽  
pp. 392-399 ◽  
Keyword(s):  
Angular Distribution ◽  
Differential Cross Section ◽  
Cross Section ◽  
Differential Cross ◽  
Proton Scattering ◽  
Centre Of Mass ◽  
Minimum Value

The angular distribution for neutron-proton scattering at 156 ± 3 MeV has been determined for centre-of-mass scattering angles between 50 and 178°. The ratio σ(π) / σ (1/2 π ) is 5·0, and the minimum value of the differential cross-section occurs at an angle between 75 and 85°.

Transition state dynamics of F + Br2 reactive scattering

1994 ◽  
Vol 72 (3) ◽  
pp. 523-528 ◽  
Author(s):  
Zhen Zheng Zhu ◽  
Richard W.P. White ◽  
David J. Smith ◽  
Roger Grice
Keyword(s):  
Energy Surface ◽  
Forward Direction ◽  
Translational Energy ◽  
Buffer Gas ◽  
Reactive Scattering ◽  
Wide Angle ◽  
Available Energy ◽  
Angle Scattering ◽  
Large Impact Parameter ◽  
Forward Hemisphere

Reactive scattering of F atoms with Br2 molecules has been studied at an initial translational energy E ∼ 16 kJ mol−1 using a supersonic beam of F atoms seeded in Ne buffer gas. Laboratory angular and velocity distributions of BrF product have been measured. They show sharp peaking in the forward direction with almost isotropic wide angle scattering of relative intensity ∼ 0.2. Approximately half the total available energy is disposed into product translation for scattering in the forward and backward directions with slightly lower translational energy for the sideways scattering. The combination of sharp forward scattering and high product translational energy is attributed to early migratory trajectories in large impact parameter collisions whereby the F atom reacts with the more distant Br atom of the Br2 molecule lying in the forward hemisphere. The isotropic wide angle scattering arises from direct trajectories in which the F atom reacts with the nearer Br atom of the Br2 molecule. Migratory dynamics are promoted by charge transfer interaction of the form Br2+F− which stabilises the potential energy surface in elongated isosceles triangular FBr2 configurations as well as in slightly bent FBrBr configurations. Comparison is made with the dynamics of the F + Cl2, I2, and CCl3Br reactions.

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