Monte Carlo trajectory study of Ar+H2collisions. I. Potential energy surface and cross sections for dissociation, recombination, and inelastic scattering

1976 ◽  
Vol 65 (12) ◽  
pp. 5335-5356 ◽  
Author(s):  
Normand C. Blais ◽  
Donald G. Truhlar
Keyword(s):  
Monte Carlo ◽  
Potential Energy ◽  
Potential Energy Surface ◽  
Inelastic Scattering ◽  
Cross Sections ◽  
Energy Surface

Semiclassical study of sudden approximations for rotationally inelastic scattering of Ar + HF

1994 ◽  
Vol 72 (3) ◽  
pp. 985-994 ◽  
Author(s):  
James J. C. Barrett ◽  
Howard R. Mayne ◽  
Mark Keil ◽  
Leslie J. Rawluk
Keyword(s):  
Potential Energy ◽  
Potential Energy Surface ◽  
Inelastic Scattering ◽  
Cross Sections ◽  
Differential Cross ◽  
Infinite Order ◽  
Energy Surface ◽  
Differential Cross Sections ◽  
Sudden Approximation ◽  
Rotationally Inelastic Scattering

"Exact" quantum close coupled (CC) and infinite-order sudden approximation (IOSA) calculations have been carried out for the Ar + HF system on an accurate potential energy surface. The differential cross sections from the IOSA calculations show marked differences from the CC results. We find that the energy sudden component of the IOSA breaks down in a different manner for small and large impact parameters, significantly shifting and distorting the state-to-state differential cross sections. We also find that the centrifugal sudden approximation alone reproduces all features of the full semiclassical calculations quite faithfully. Through the use of several rotational sudden approximations, including a semiclassical version of the IOSA, we identify how the differences between the CC and IOSA results arise.

Rotational de-excitations of C3H+ (1Σ+) by collision with He: new ab initio potential energy surface and scattering calculations

2020 ◽  
Vol 494 (4) ◽  
pp. 5675-5681 ◽  
Author(s):  
Sanchit Chhabra ◽  
T J Dhilip Kumar
Keyword(s):  
Potential Energy ◽  
Potential Energy Surface ◽  
Ab Initio ◽  
Cross Sections ◽  
Energy Surface ◽  
Molecular Ions ◽  
Basis Set ◽  
Rate Coefficients ◽  
Close Coupling ◽  
Collisional Rate Coefficients

ABSTRACT Molecular ions play an important role in the astrochemistry of interstellar and circumstellar media. C3H+ has been identified in the interstellar medium recently. A new potential energy surface of the C3H+–He van der Waals complex is computed using the ab initio explicitly correlated coupled cluster with the single, double and perturbative triple excitation [CCSD(T)-F12] method and the augmented correlation consistent polarized valence triple zeta (aug-cc-pVTZ) basis set. The potential presents a well of 174.6 cm−1 in linear geometry towards the H end. Calculations of pure rotational excitation cross-sections of C3H+ by He are carried out using the exact quantum mechanical close-coupling approach. Cross-sections for transitions among the rotational levels of C3H+ are computed for energies up to 600 cm−1. The cross-sections are used to obtain the collisional rate coefficients for temperatures T ≤ 100 K. Along with laboratory experiments, the results obtained in this work may be very useful for astrophysical applications to understand hydrocarbon chemistry.

scholarly journals Theoretical Study of Rb2in HeN: Potential Energy Surface and Monte Carlo Simulations

2011 ◽  
Vol 115 (25) ◽  
pp. 6918-6926 ◽  
Author(s):  
Grégroire Guillon ◽  
Alexandre Zanchet ◽  
Markku Leino ◽  
Alexandra Viel ◽  
Robert E. Zillich
Keyword(s):  
Monte Carlo ◽  
Potential Energy ◽  
Potential Energy Surface ◽  
Monte Carlo Simulations ◽  
Energy Surface ◽  
Theoretical Study

Investigation of rotational state-changing collisions of C2N− ions with helium

2019 ◽  
Vol 15 (S350) ◽  
pp. 443-444
Author(s):  
Jan Franz ◽  
Francesco Antonio Gianturco
Keyword(s):  
Dipole Moment ◽  
Potential Energy ◽  
Potential Energy Surface ◽  
Cross Sections ◽  
Energy Surface ◽  
Inelastic Collisions ◽  
Atomic Gases ◽  
Molecular Anion ◽  
Helium Atoms ◽  
Molecular Anions

AbstractThe cross sections for rotational inelastic collisions between atoms and a molecular anion can be very large, if the anion has a dipole moment. This makes molecular anions very efficient in cooling atomic gases. We address rotational inelastic collisions of Helium atoms with the molecular anion C2N–. Here we present preliminary calculations of the potential energy surface.

scholarly journals Ab initio potential-energy surface and rotationally inelastic integral cross sections of the Ar–CH4 complex

1997 ◽  
Vol 107 (3) ◽  
pp. 902-913 ◽  
Author(s):  
Tino G. A. Heijmen ◽  
Tatiana Korona ◽  
Robert Moszynski ◽  
Paul E. S. Wormer ◽  
Ad van der Avoird
Keyword(s):  
Potential Energy ◽  
Potential Energy Surface ◽  
Ab Initio ◽  
Cross Sections ◽  
Energy Surface
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