processes

IAA (IAA)

PERMLINK: www.lxcat.net/IAA

DESCRIPTION: Combination up to 2022 of experimental, theoretical and own calculations of electron integral/differential cross sections with atmospheric species. The work was realised by Anthony Schmalzried during his PhD thesis at the Instituto de Astrofísica de Andalucía in Granada, Spain under the supervision of Dr. Alejandro Luque and Dr. Nikolai Lehtinen from the University of Bergen, Norway. Compiled data was only extracted from published results but not from other databases on lxcat. Highlights: * Use of analytical formulae for electronic exc. and ionisation. * Use of Born-Bethe extrapolation for total scattering cross section * Use of the scattering length for the CS at zero energies * Complete set of electronic inelastic processes in the mathematical sense of the dipole oscillator strength (it satisfies the Bethe sum rule) * The DCS is coherent with the elastic integral and momentum-transfer cross sections. Vulnerability: All momentum-transfer CS labelled in the datagroup MOMENTUM have been converted from the RESIDUAL elastic cross section through the multiplication by 1- (average deviation cosine). These may not be necessarily accurate, especially in regions where the DCS is sparse. Transport parameters at low energies with this MTCS will be less accurate than in other databases because our MTCS are derived from the residual elastic cross section after subtracting all inelastic (except rotational exc.) from the total scattering cross section (which is usually known with great accuracy). You may wish to take momentum-transfer cross sections from another database, but beware that even if more accurate results are obtained, the database will lose its coherence! List of abbreviations used in comments: a0 : Bohr radius (~5.29177e-11 m) DCS : differential cross section ICS : integral (elastic) cross section MTCS : momentum-transfer (elastic) cross section OOS : optical oscillator strength A : scattering length MERT: modified effective range theory RBEQ* : relativistic binary encounter Bethe "Q" model from [Kim et al, Phys. Rev. A 62, 052710 (2000)] (* = revised in the thesis)

CONTACT: Anthony Schmalzried
email: anthony.schmalzried@@mailfence.com
Alejandro Luque, Senior Researcher at the Instituto de Astrofísica de Andalucía, Granada
email: aluque@iaa.es

HOW TO REFERENCE: A. Schmalzried, A. Luque and N. Lehtinen, IAA Database on lxcat, www.lxcat.net/IAA, August 2023, Instituto de Astrofísica de Andalucía.

SCATTERING CROSS SECTIONS

Data Group [INTEGRAL]: Integral elastic cross section obtained from the integration of elastic differential cross sections in our database.

e / NO

Data Group [TOTAL]: "Grand total" scattering cross sections obtained from a survey of the most accurate and recent experimental data.

e / NO

Data Group [MOMENTUM]: Elastic momentum-transfer cross sections obtained from elastic cross sections through the average deviation cosine.

e / NO

Data Group [RESIDUAL]: Residual elastic cross section obtained by subtracting all inelastic processes except rotational excitations from the total scattering cross section (TOTAL).

Step 6: Select processes & click next

SELECT ALL & FILTER TOOL

IAA (IAA)

e / NO

Data Group [INTEGRAL]: Integral elastic cross section obtained from the integration of elastic differential cross sections in our database.

e / NO

Data Group [TOTAL]: "Grand total" scattering cross sections obtained from a survey of the most accurate and recent experimental data.

e / NO

Data Group [MOMENTUM]: Elastic momentum-transfer cross sections obtained from elastic cross sections through the average deviation cosine.

e / NO

Data Group [RESIDUAL]: Residual elastic cross section obtained by subtracting all inelastic processes except rotational excitations from the total scattering cross section (TOTAL).

e / NO

Data Group [ROTATIONAL]: Set of rotational excitations to be weighted by the statistical (Boltzmann) distribution of excited species according to the temperature of the gas.

e / NO

Step 6: Select processes & click next

SELECT ALL & FILTER TOOL

IAA (IAA)

e / NO

Data Group [INTEGRAL]: Integral elastic cross section obtained from the integration of elastic differential cross sections in our database.

e / NO

Data Group [TOTAL]: "Grand total" scattering cross sections obtained from a survey of the most accurate and recent experimental data.

e / NO

Data Group [MOMENTUM]: Elastic momentum-transfer cross sections obtained from elastic cross sections through the average deviation cosine.

e / NO

Data Group [RESIDUAL]: Residual elastic cross section obtained by subtracting all inelastic processes *except rotational excitations* from the total scattering cross section (TOTAL).

e / NO

Data Group [ROTATIONAL]: Set of rotational excitations to be weighted by the statistical (Boltzmann) distribution of excited species according to the temperature of the gas.

e / NO

Data Group [RESIDUAL]: Residual elastic cross section obtained by subtracting all inelastic processes except rotational excitations from the total scattering cross section (TOTAL).