RxnPhysics Block

The RxnPhysics Block only contains a kind and two sub-blocks: RxnRate Sub-Block and RxnProductGenerator Sub-Block. The RxnPhysics block sets the physics of a particular interaction, and is pointed to in the rxnPhysics parameter of a RxnProcess Block

kind (string, required)

The kind will always be generalCollision

RxnRate Sub-Block

kind

This block will be used to determine the likelihood of a collision based on a reaction rate or a cross-section. There are several options for setting the reaction rate or cross-section:

• Constant Cross-Section

• Power Law Cross-Section

• Exponential Polynomial Cross-Section

• Two-Column File Format

• Field Ionization DCADK

• Field Ionization Average ADK

• Decay Rate

RxnProductGenerator Sub-Block

kind (string, required)

This will set the physical process. The options for kind are:

• Binary Elastic

• Electron Scatter

• Binary Excitation

• Charge Exchange

• Binary Reaction

• Electron Attachment

• Negative Ion Detachment

• Impact Ionization

• Electron Ionization

• Dissociative Ionization

• Field Ionization

• Decay

• Binary Recombination

• Three Body Recombination

• Dissociative Recombination

• Electron Impact Dissociation

Example

Below is an example of a complete RxnPhysics block

<RxnPhysics impactElasticPrimaryElectronsbinaryElastic>
  kind = generalCollision
  <RxnRate rxnRate>
    kind = twoColumnFile
    crossSectionVariable = energy
    file = sampleElasticCrossSection.dat
  </RxnRate>
  <RxnProductGenerator productGenerator>
    kind = binaryElastic
    #anisotropy = 0
    #randomSeed = 423
  </RxnProductGenerator>
</RxnPhysics>