### Abstract

We describe a method for calculating cross sections for atom plus diatom reactive collisions based on the centrifugal sudden distorted wave (CSDW) approximation. This method is nearly exact at low energies where reactive cross sections are small. Representative CPU times are given for applications of the CSDW method to the Cl + HCl → ClH + Cl reaction using CDC 7600, Cyber 176, Cyber 205, Cray X-MP and Cray-2 computers. We also present differential cross sections for the Cl + HCl reaction and apply a simple semiclassical model which relates these cross sections to the partial wave reaction probabilities, and to the energy dependence of the reaction probabilities for zero total angular momentum. This model explains why the differential cross sections are backward peaked, and why the oscillatory cross sections seen in earlier, more approximate infinite order sudden calculations are not found in the present results at low energy.

Original language | English |
---|---|

Pages (from-to) | 45-53 |

Number of pages | 9 |

Journal | Computer Physics Communications |

Volume | 47 |

Issue number | 1 |

DOIs | |

Publication status | Published - 1987 |

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### ASJC Scopus subject areas

- Computer Science Applications
- Physics and Astronomy(all)

### Cite this

**The centrifugal sudden distorted wave method for calculating cross sections for chemical reactions : Angular distributions for Cl + HCl → ClH + Cl.** / Schatz, George C; Amaee, B.; Connor, J. N L.

Research output: Contribution to journal › Article

*Computer Physics Communications*, vol. 47, no. 1, pp. 45-53. https://doi.org/10.1016/0010-4655(87)90065-8

}

TY - JOUR

T1 - The centrifugal sudden distorted wave method for calculating cross sections for chemical reactions

T2 - Angular distributions for Cl + HCl → ClH + Cl

AU - Schatz, George C

AU - Amaee, B.

AU - Connor, J. N L

PY - 1987

Y1 - 1987

N2 - We describe a method for calculating cross sections for atom plus diatom reactive collisions based on the centrifugal sudden distorted wave (CSDW) approximation. This method is nearly exact at low energies where reactive cross sections are small. Representative CPU times are given for applications of the CSDW method to the Cl + HCl → ClH + Cl reaction using CDC 7600, Cyber 176, Cyber 205, Cray X-MP and Cray-2 computers. We also present differential cross sections for the Cl + HCl reaction and apply a simple semiclassical model which relates these cross sections to the partial wave reaction probabilities, and to the energy dependence of the reaction probabilities for zero total angular momentum. This model explains why the differential cross sections are backward peaked, and why the oscillatory cross sections seen in earlier, more approximate infinite order sudden calculations are not found in the present results at low energy.

AB - We describe a method for calculating cross sections for atom plus diatom reactive collisions based on the centrifugal sudden distorted wave (CSDW) approximation. This method is nearly exact at low energies where reactive cross sections are small. Representative CPU times are given for applications of the CSDW method to the Cl + HCl → ClH + Cl reaction using CDC 7600, Cyber 176, Cyber 205, Cray X-MP and Cray-2 computers. We also present differential cross sections for the Cl + HCl reaction and apply a simple semiclassical model which relates these cross sections to the partial wave reaction probabilities, and to the energy dependence of the reaction probabilities for zero total angular momentum. This model explains why the differential cross sections are backward peaked, and why the oscillatory cross sections seen in earlier, more approximate infinite order sudden calculations are not found in the present results at low energy.

UR - http://www.scopus.com/inward/record.url?scp=0002315202&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0002315202&partnerID=8YFLogxK

U2 - 10.1016/0010-4655(87)90065-8

DO - 10.1016/0010-4655(87)90065-8

M3 - Article

VL - 47

SP - 45

EP - 53

JO - Computer Physics Communications

JF - Computer Physics Communications

SN - 0010-4655

IS - 1

ER -