Calculation of total ionization cross section

In summary, the calculation of total ionization cross section involves a charge-weighted sum of partial ionization cross sections for gases capable of multiple ionization, such as Xenon. While the total cross section can be represented as a simple addition of the partial ionization cross sections, it is more accurate to use the charge-weighted sum in order to account for the different states and potential subsequent ionizations of the gas. This allows for a more comprehensive understanding of the ionization process.
  • #1
vrinda mukund
37
0
Hai all,
I need some help in understanding the calculation of total ionization cross section. As per the literatures, for a gas capable of multiple ionization, the total cross section is a charge-weighted sum of partial ionization cross sections. To be more elaborate, consider the case of Xenon. Upon electron impact, Xe can become Xe+ or Xe2+ or Xe3+ ... , cross sections of which are respectively represented as σ1, σ2, σ3 ... etc.
Then total ionization cross section for Xe will be calculated as
σtotal = σ1+ (2*σ2) +(3*σ3)+... .
So my question is, why can't we just add the partial ionization cross section to calculate total ionization cross section instead of adding charge weighted sum ?
 
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  • #2
Do you want to calculate how many xenon atoms get ionized (independent of their state), or how many electrons get set free?
Also, Xe3+ can capture electrons from other xenon atoms afterwards, leading to 3 Xe+ ions for example.
 

Related to Calculation of total ionization cross section

1. What is the total ionization cross section?

The total ionization cross section is a measure of the probability that an incident particle (usually a charged particle) will undergo an ionizing collision with an atom or molecule. It represents the total area of interaction between the particle and the target, and is typically expressed in units of square meters (m^2).

2. How is the total ionization cross section calculated?

The total ionization cross section is calculated using theoretical models and experimental data. Theoretical models use quantum mechanical calculations to predict the probability of ionization based on the properties of the target atom or molecule and the incident particle. Experimental data involves measuring the ionization cross section in a laboratory setting and using statistical methods to determine the overall trend.

3. What factors affect the total ionization cross section?

The total ionization cross section is affected by a variety of factors, including the energy of the incident particle, the type of target atom or molecule, and the angle of incidence. The ionization cross section also depends on the specific type of ionization process, such as single or multiple ionization.

4. Why is the total ionization cross section important in scientific research?

The total ionization cross section is an important parameter in many areas of scientific research, particularly in the fields of particle physics, astrophysics, and atmospheric science. It provides valuable information about the interactions between particles and matter, and can help scientists better understand the behavior of particles in various environments.

5. Can the total ionization cross section be used in practical applications?

Yes, the total ionization cross section can be used in practical applications, such as in radiation dosimetry and radiation therapy. It is also used in the design and analysis of particle accelerators, as well as in the development of new materials for radiation shielding.

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