Atomic and Molecular Collisions Group

 Direct Scattering Cross Sections

 

 

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 Please consult the original publications when using these data.

H Projectiles

Process  File Source
 H + He  H_He.txt 'Collisions of keV-energy H atoms with the rare gases: Absolute differential cross sections at small angles' Phys. Rev. A 40 4914 (1989), R. S. Gao et al.
 H + Ne  H_Ne.txt

 "
 H + Ar  H_Ar.txt

 "
 H + Kr  H_Kr.txt

"
 H + Xe  H_Xe.txt

 "
 H + H2  H_H2.txt 'Absolute differential cross sections for very-small-angle scattering of keV H and He atoms by H2 and N2' Phys. Rev. A 38, 2794 (1988), L. K. Johnson et al.
 H + N2  H_N2.txt

 "
 H + O2  H_O2.txt 'Differential cross sections for scattering of 0.5-, 1.5-, and 5.0 keV hydrogen atoms by He, H2, N2, and O2' J. Geophys. Res. 91 8947 (1986), J. H. Newman et al.

Notes:

  • All of the wide angle data are from 'Differential cross sections for scattering of 0.5-, 1.5-, and 5.0 keV hydrogen atoms by He, H2, N2, and O2' J. Geophys. Res. 91 8947 (1986), J. H. Newman et al. but all available data are plotted in the papers by Gao et al. (1990) and Johnson et al. (1988). Also note the correction to one of the tables in the Newman et al. (1986) paper (J. Geophys. Res. 94 7019 (1989)).
  • The measured cross sections include contributions from all elastic and inelastic processes resulting in a fast neutral product.
  • The first column in each table is the laboratory scattering angle (deg); the third, fifth, and seventh columns are the differential cross sections (10-16 cm2 sr-1). The other columns give the respective uncertainties.

H+ Projectiles

Process  File Source
 H+ + He  H+_He_DS.txt 'Absolute differential cross sections for small-angle H+-He direct and charge-transfer scattering at keV energies', Phys. Rev. A 40, 3626 (1989), L. K. Johnson et al.
 H+ + Ne  H+_Ne_DS.txt 'Direct and charge-transfer scattering of keV-energy H+ and He+ projectiles from rare-gas atoms to obtain small-angle absolute differential cross sections' Phys. Rev. A 40 4920 (1989), L. K. Johnson et al.
 H+ + Ar  H+_Ar_DS.txt

 "
 H+ + Kr  H+_Kr_DS.txt

"
 H+ + Xe  H+_Xe_DS.txt

 "
 H+ + H2  H+_H2_DS.txt  'Collisions between H+ and H2 at kilo-electron-volt energies: Absolute differential cross sections for small-angle direct, single, and double-charge transfer scattering' Phys. Rev. A 44, 5599(1991), R. S. Gao et al.
 H+ + N2  H+_N2_DS.txt 'Theoretical and experimental studies of the H+-N2 system: Differential cross sections for direct and charge-transfer scattering at keV energies', Phys. Rev. A 66, 042712 (2002), R. Cabrera-Trujillo et al.
 H+ + O2  H+_O2_DS.txt 'Absolute differential and total cross sections for direct and charge-transfer scattering of keV protons by O2', Phys. Rev. A 70, 042705 (2004), R. Cabrera-Trujillo, Y. Öhrn, E. Deumens, J. R. Sabin, and B. G. Lindsay.

Notes:

  • The measured cross sections include contributions from all elastic and inelastic processes resulting in a fast proton.
  • The first column in each table is the laboratory scattering angle (deg); the third column is the differential cross section (10-16 cm2 sr-1). The other two columns give the respective uncertainties. The H+ + H2 data were scanned from the original paper and error bars are not given.

He Projectiles

Process  File Source
 He + He He_He.txt

 'Differential scattering cross sections for collisions of 0.5-, 1.5-, and 5.0 keV helium atoms with He, H2, N2, and O2' J. Geophys. Res. 90, 11045 (1985), J. H. Newman et al.

'Absolute differential cross sections for very-small-angle elastic scattering in He + He collisions at keV energies' Phys. Rev. A 35, 4541 (1987), D. E. Nitz et al.

 He + H2  He_H2.txt  'Absolute differential cross sections for very-small-angle scattering of keV H and He atoms by H2 and N2' Phys. Rev. A 38, 2794 (1988), L. K. Johnson et al.
 He + N2  He_N2.txt

 "
 He + O2 He_O2.txt 'Differential scattering cross sections for collisions of 0.5-, 1.5-, and 5.0 keV helium atoms with He, H2, N2, and O2' J. Geophys. Res. 90, 11045 (1985), J. H. Newman et al.

Notes:

  • All of the wide angle data are from 'Differential scattering cross sections for collisions of 0.5-, 1.5-, and 5.0 keV helium atoms with He, H2, N2, and O2' J. Geophys. Res. 90, 11045 (1985), J. H. Newman et al. but all available data are plotted in the referenced papers.
  • The measured cross sections include contributions from all elastic and inelastic processes resulting in a fast neutral product.
  • The first column in each table is the laboratory scattering angle (deg); the third column is the differential cross section (10-16 cm2 sr-1). The other two columns give the respective uncertainties.
  • For He + He, the data at angles of 0.5 degrees or more are from Newman et al. (1985) and most of those at smaller angles are from Nitz et al. (1987).

He+ Projectiles

Process  File Source
 He+ + He  He+_He_DS.txt 'Direct and charge-transfer scattering of keV-energy H+ and He+ projectiles from rare-gas atoms to obtain small-angle absolute differential cross sections' Phys. Rev. A 40 4920 (1989), L. K. Johnson et al.
 He+ + Ne  He+_Ne_DS.txt

 "
 He+ + Ar  He+_Ar_DS.txt

 "
 He+ + Kr  He+_Kr_DS.txt

"
 He+ + Xe  He+_Xe_DS.txt

 "

Notes:

  • The measured cross sections include contributions from all elastic and inelastic processes resulting in a fast He+.
  • The first column in each table is the laboratory scattering angle (deg); the third column is the differential cross section (10-16 cm2 sr-1). The other two columns give the respective uncertainties.

O Projectiles

 Process  E = 100 eV E = 500 eV  E = 1500 eV
 O + He    O_He_500.txt  O_He_1500.txt
 O + Ne    O_Ne_500.txt  O_Ne_1500.txt
 O + Ar    O_Ar_500.txt  O_Ar_1500.txt
 O + Kr    O_Kr_500.txt  O_Kr_1500.txt
 O + Xe    O_Xe_500.txt  O_Xe_1500.txt
 O + H2    O_H2_500.txt  O_H2_1500.txt
 O + N2  O_N2_100.txt  O_N2_500.txt  O_N2_1500.txt
 O + O2    O_O2_500.txt  O_O2_1500.txt
 O + CO  O_CO_100.txt  O_CO_500.txt  O_CO_1500.txt
 O + CO2  O_CO2_100.txt  O_CO2_500.txt  O_CO2_1500.txt
 O + H2O  O_H2O_100.txt  O_H2O_500.txt  O_H2O_1500.txt
 O + SO2    O_SO2_500.txt  O_SO2_1500.txt
 O + NH3    O_NH3_500.txt  O_NH3_1500.txt
 O + CH4    O_CH4_500.txt  O_CH4_1500.txt
 O + CF4    O_CF4_500.txt  O_CF4_1500.txt
 O + SF6    O_SF6_500.txt  O_SF6_1500.txt

Notes:

  • E is the laboratory energy of the O projectile.
  • The measured cross sections include contributions from all elastic and inelastic processes resulting in a fast neutral oxygen atom product.
  • The first column in each table is the laboratory scattering angle (deg); the third, fifth, and seventh columns are the differential cross sections (10-16 cm2 sr-1). The other columns give the respective uncertainties.
  • These data are from 'Absolute differential cross sections for scattering of keV O-atoms' Phys Rev A 53, 1581 (1996), G. J. Smith, R. S. Gao, B. G. Lindsay, K. A. Smith and R. F. Stebbings.
  • These data supercede those in 'Differential cross sections for scattering of 0.5-, 1.5-, and 5.0-keV oxygen atoms by He, N2, and O2', J. Geophys. Res. 92, 6107 (1987), D. A. Schafer, J. H. Newman, K. A. Smith, and R. F. Stebbings.
  • The 100 eV cross sections were calculated from an extrapolation of the high energy measurements.

O+ Projectiles

Process  Files Source
 O+ + He

 O+_He_DS.txt

O+_He_100.txt

'Absolute differential cross sections for direct scattering of keV O+ ions by He, H2, N2, and O2' J. Geophys. Res. 109, A08305, B. G. Lindsay
 O+ + H2  O+_H2_DS.txt

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 O+ + N2

 O+_N2_DS.txt

O+_N2_100.txt

 "
 O+ + O2

 O+_O2_DS.txt

O+_O2_100.txt

"

Notes:

  • The measured cross sections include contributions from all elastic and inelastic processes resulting in a fast O+ ion.
  • The first column in each table is the laboratory scattering angle (deg); the third column is the differential cross section (10-16 cm2 sr-1). The other two columns give the respective uncertainties.
  • The 100 eV cross sections were calculated from an extrapolation of the high energy measurements.

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Updated April 29, 2005