Computed vibrational excitation of CF 4 by low-energy electrons and positrons: Comparing calculations and experiments

Quantum calculations for the excitation of the asymmetric modes of the CF4 target gas, 3 and 4, by impact of low-energy electrons and positrons are carried out in the energy range around 1 eV and are compared with recent experimental findings. The similarities and differences between the two types of projectiles, and the two different modes, are analyzed and discussed vis a vis the present accord with the experimental results

[1]  K. Willner,et al.  Ramsauer-Townsend effect for electron scattering from gaseousCF4molecules , 2007 .

[2]  K. Willner,et al.  Low-energy expansion of the Jost function for long-range potentials , 2006 .

[3]  C. Surko,et al.  Systematic comparison of positron- and electron-impact excitation of theν3vibrational mode ofCF4 , 2005 .

[4]  T. Nishimura,et al.  The dominant “heating” mode: bending excitation of water molecules by low-energy positron impact , 2005 .

[5]  C. Surko,et al.  Low-energy positron interactions with atoms and molecules , 2005 .

[6]  F A Gianturco,et al.  Vibrational excitation of CF4 by electron impact: a computational analysis , 2005 .

[7]  T. Nishimura,et al.  Computing vibrational effects in low-energy positron scattering from polyatomic molecules: the H2O and C2H2 stretching modes , 2004 .

[8]  T. Nishimura,et al.  The scattering of positrons from CF4 molecules at ultralow energies , 2004 .

[9]  T. Nishimura,et al.  Vibrational excitation of water by low-energy electron scattering: Calculations and experiments , 2004 .

[10]  T. Nishimura,et al.  Virtual-state formation in positron scattering from vibrating molecules: a gateway to annihilation enhancement. , 2003, Physical review letters.

[11]  C. Surko,et al.  Positron scattering from atoms and molecules using a magnetized beam , 2002 .

[12]  T. Nishimura,et al.  Vibrational excitation of methane by positron impact: Computed quantum dynamics and sensitivity tests , 2002 .

[13]  C. Surko,et al.  Low energy positron scattering and annihilation studies using a high resolution trap-based beam , 2002 .

[14]  F. Gianturco,et al.  Computing positron annihilation in polyatomic gases: An exploratory study , 2001 .

[15]  R. Čurík,et al.  Vibrational excitation in electron-CH4collisions: exchange interaction effects , 2001 .

[16]  J. Sullivan,et al.  Excitation of molecular vibrations by positron impact. , 2001, Physical review letters.

[17]  M. Cascella,et al.  Electron-impact vibrational excitation of polyatomic gases: Exploratory calculations , 2001 .

[18]  Greaves,et al.  Inward transport and compression of a positron plasma by a rotating electric field , 2000, Physical review letters.

[19]  L. Christophorou,et al.  Electron Interactions With Plasma Processing Gases: An Update for CF4, CHF3, C2F6, and C3F8 , 1999 .

[20]  C. Surko,et al.  POSITRON SCATTERING FROM ATOMS AND MOLECULES AT LOW ENERGIES , 1999 .

[21]  Y. Itikawa,et al.  Mode Dependence in Vibrational Excitation of a CO 2 Molecule by Electron and Positron Impacts , 1998 .

[22]  Natalie M. Cann,et al.  Absolute scale determination for photoabsorption spectra and the calculation of molecular properties using dipole sum-rules , 1997 .

[23]  Y. Itikawa Electron-impact vibrational excitation of polyatomic molecules , 1997 .

[24]  W. Kauppila,et al.  Measurements of total and positronium formation cross sections for positrons and electrons scattered by hydrogen atoms and molecules , 1997 .

[25]  L. Christophorou,et al.  Electron Interactions with CF4 , 1996 .

[26]  Nico Sanna,et al.  Low‐energy electron scattering by halomethanes: Elastic and differential cross sections for CF4 , 1996 .

[27]  N. Sanna,et al.  Calculation of integral cross sections for vibrationally inelastic electron-methane scattering , 1995 .

[28]  R. Bonham Electron Impact Cross Section Data for Carbon Tetrafluoride. , 1994 .

[29]  Nico Sanna,et al.  Calculation of low‐energy elastic cross sections for electron‐CF4 scattering , 1994 .

[30]  F. Linder,et al.  Low-energy electron scattering from halomethanes. II. Direct and resonant vibrational excitation in e-CF4 scattering , 1992 .

[31]  Kenneth J. Miller,et al.  Additivity methods in molecular polarizability , 1990 .

[32]  W. Kauppila,et al.  Comparisons of Positron And Electron Scattering By Gases , 1989 .

[33]  Gianturco,et al.  Low-energy structure in electron-silane scattering. , 1987, Physical review. A, General physics.

[34]  F. Gianturco,et al.  Local approximations of exchange interaction in electron-molecule collisions: the methane molecule , 1987 .

[35]  A. Jain,et al.  The theory of electron scattering from polyatomic molecules , 1986 .

[36]  R. Nieminen,et al.  Electron-positron density-functional theory. , 1986, Physical review. B, Condensed matter.

[37]  D. M. Bishop,et al.  Vibrational Contributions to Molecular Dipole Polarizabilities , 1982 .

[38]  N. Chandra,et al.  Hybrid theory and calculation of e-N2 scattering. [quantum mechanics - nuclei (nuclear physics) , 1975 .

[39]  N. Chandra,et al.  Electron-molecule interactions. IV. Scattering by polyatomic molecules , 1972 .