Why Do UV Photoabsorption Cross Sections Show a Kink at 10-100 Angstrom?

  • Context: Graduate 
  • Thread starter Thread starter vrinda mukund
  • Start date Start date
  • Tags Tags
    Cross
Click For Summary
SUMMARY

The discussion centers on the observed kink in UV photoabsorption cross sections of various gases at wavelengths between 10-100 Angstrom. This kink indicates that the energy levels at these wavelengths are sufficient to initiate ionization processes. As the energy increases, more ionization mechanisms become available, leading to a greater number of steps in the absorption process. Understanding this phenomenon is crucial for applications in spectroscopy and atmospheric science.

PREREQUISITES
  • Understanding of UV photoabsorption principles
  • Familiarity with ionization processes in gases
  • Knowledge of spectroscopy techniques
  • Basic concepts of wavelength and energy relationships
NEXT STEPS
  • Research the mechanisms of ionization in gases at different energy levels
  • Explore UV spectroscopy techniques and their applications
  • Study the relationship between wavelength and energy in photon interactions
  • Investigate the impact of different gases on UV photoabsorption cross sections
USEFUL FOR

Researchers in atmospheric science, physicists studying ionization processes, and professionals working with UV spectroscopy will benefit from this discussion.

vrinda mukund
Messages
36
Reaction score
0
N2.png
O2.png
CH4.png
H2O.png
N2.png
O2.png
CH4.png
H2O.png
N2.png
O2.png
CH4.png
H2O.png
N2.png
O2.png
CH4.png
H2O.png
If we look into the UV photoabsorption cross sections of different gases, a kink in the cross section is seen at wavelength between 10-100 Angstrom. Can some one explain why this happens ?
 

Attachments

  • N2.png
    N2.png
    15.9 KB · Views: 1,310
  • O2.png
    O2.png
    17.1 KB · Views: 1,182
  • CH4.png
    CH4.png
    15.4 KB · Views: 1,120
  • H2O.png
    H2O.png
    16.1 KB · Views: 1,143
Physics news on Phys.org
This typically means the energy is sufficient for some ionization process for wavelengths smaller than the kink location.
You get more of th se steps for higher energies when more ionization processes become possible. Here is an example .
 

Similar threads

Undergrad Absorption cross section of light in air
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Probability of resonant ionization
  • · Replies 18 ·
Replies
18
Views
2K
Misc. Yarn cross-section and path length
  • · Replies 3 ·
Replies
3
Views
736
Graduate Confused about noise power spectral density measurement
  • · Replies 0 ·
Replies
0
Views
2K
Graduate Question about PDH locking a cavity
  • · Replies 2 ·
Replies
2
Views
3K
Graduate Bulk and Slab electronic structure differences
  • · Replies 6 ·
Replies
6
Views
3K
Graduate Born-Bethe approximation for cross section
  • · Replies 1 ·
Replies
1
Views
3K
High School EM radiation creation within stars
  • · Replies 3 ·
Replies
3
Views
2K
Undergrad Differential cross-sectional area - Rutherford's experiment
  • · Replies 3 ·
Replies
3
Views
3K
Graduate Quantum projection when measuring state population
  • · Replies 8 ·
Replies
8
Views
2K