Hello, as a newbie in THz measurement, I encountered something strange when I tried to remove the absorption peaks in the THz measurement by pumping nitrogen into the chamber.
I found that most of the absorption peaks can be removed, such as the ones around 0.55, 0.75, 1 THz, 1.22 THz and 1.42 THz; however, the ones around 1.11 and 1.3 THz could not be removed clean even though other peaks were already unnoticeable and they just stayed there no matter how long the nitrogen pumping was. Does anyone have similar experience and how would you solve the problem? I was surprised since if these peaks are all from water vapor in the air, why they don't disappear simultaneously?
Purging nitrogen cannot completely remove moisture, no matter how long or how hard you pump. There will be always few percent moisture stay in the nitrogen atmosphere (I forget exact value).
One efficient way of removing moisture is to create a vacuum environment with vacuum pumping. I'm not sure if this suits your case.
Thank you Joongmok! Unfortunately the designed resonance of our sample overlaps with the H2O absorption, so probably difficult to remove the absorption peak directly.
- Badges
- Science topic
- Similar topics
- Computer Science and Engineering
- Artificial Intelligence