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Corrections to measured sample pressures in low temperature collisional cooling experiments
1Department of Physics, Astronomy and Geophysics, Connecticut College, New London 06320, USA.
Summary
Three thermal transpiration models were evaluated for collisional cooling experiments. Two models showed similar correction patterns, while the third diverged at lower pressures.
Area of Science:
- Physics
- Physical Chemistry
Background:
- Collisional cooling experiments require accurate thermal transpiration corrections.
- Understanding gas behavior under varying pressures and temperatures is crucial.
Purpose of the Study:
- To compare the performance of three distinct thermal transpiration models.
- To identify the most suitable model for collisional cooling applications across different pressure ranges.
Main Methods:
- Testing three thermal transpiration models.
- Evaluating model performance across a range of pressures (0-8 Torr) and temperatures.
- Analyzing calculated corrections for each model.
Main Results:
- Two models exhibited similar correction patterns, differing mainly in magnitude.
- The third model's pattern aligned with the other two only above approximately 2 Torr.
- Model discrepancies were observed at lower pressures.
Conclusions:
- The choice of thermal transpiration model significantly impacts correction accuracy in collisional cooling.
- Two models offer comparable results between 0-8 Torr, while the third is less accurate at lower pressures.
- Further investigation may be needed for optimal model selection under specific experimental conditions.