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Accuracy of the IOS approximation for highly inelastic R-T collisional energy transfer

✍ Scribed by Sheldon Green; Sally Chapman

Publisher
Elsevier Science
Year
1983
Tongue
English
Weight
448 KB
Volume
98
Category
Article
ISSN
0009-2614

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✦ Synopsis

Rate constants for rotational excitation of CO by collisions with He atoms computed within the infinite order sudden (10s) approximation

are compared with accurate quantum (coupled-states) and classical trajectory values Taking the 10s energy as the initial kinetic energy for upward, 0 -+J, transitions is found to overestimate the rates, especially for higher J (larger inelasticity). Taking the IOS energy as the initial energy for downward, J -+ 0, transitions underestimates the ra~cs by a comparable amount. The geometric average of 10s rates computed in these two ways is found to provide accurate valucx.

📜 SIMILAR VOLUMES

Accuracy of the IOS approximation for hi
Accuracy of the IOS approximation for highly inelastic RT collisional energy transfer. CO-Ar
✍ Sally Chapman; Sheldon Green 📂 Article 📅 1984 🏛 Elsevier Science 🌐 English ⚖ 442 KB

Rate corMants for rotational cscitation of CO by coUisions with Ar atoms have been computed within the infmite order sudden (LOS) approximation and compared with values from csact cirtssical trajectories. For CO-Ar, as for CO-He, nccurale values for X(0-i) -at least for small and intcrmcdiatcj -may

Accuracy of the IOS approximation for hi
Accuracy of the IOS approximation for highly inelastic RET collisions
✍ F.A. Gianturco; M. Bernardi; M. Venanzi 📂 Article 📅 1990 🏛 Elsevier Science 🌐 English ⚖ 626 KB

Inelastic collisions which give rise to rotational energy transfer (RET) at several different relative energies are examined for He and Ar projectiles interacting with Nz. Calculations are carried out within the infinite order sudden approximation (IOSA) for the dynamics and repeated more accurately