Ion collection in the bayard-alpert gauge
Abstract
A collecting factor for ions created at a given distance is computed on the basis of a simplified model and under the assumption of a Maxwell distribution of the initial velocities of ions. The factor is independent of the mass of the ion, but is a function of the temperature and takes values differing substantially from unity for usual dimensions of the collector. The effect of the collector dimensions on the x-ray-limited pressure may be analyzed by using an approximate expression for the integral collecting factor. Calculation shows that for very fine collecting wires the collecting factor is affected even by the extremely small momentum transferred to the helium ion from the electron during the ionizing collision. Experiments have confirmed the foregoing considerations, thus opening the way to the measurement of such momenta.
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Closed grids prevent generated ions from escaping the ionisation volume and therefore increase sensitivity up to a factor of 4, depending on collector diameter.
“Closed grids prevent generated ions to escape from the ionisation volume and therefore increase sensitivity up to a factor of 4, depending on the collector diameter [11,17,20].”
From A review on hot cathode ionisation gauges with focus on a suitable design for measurement accuracy and stability (2020) · cites this paper as [17]
Comsa explained that Groszkowski worked with residual gases containing diatomic molecules; ionized molecules give ions with energies up to 1 eV and higher, and higher angular momentum leads to lower capture probability.
“Comsa explained this fact that Groszkowski worked with residual gases, which contain an important number of diatomic molecules.These molecules, being ionized, give birth to ions which have velocities corresponding not only to the thermal energy (0.026 eV), but also to energies up to 1 eV and higher.Higher energies (higher angular momentum) lead to lower capture probability by the collector.”
From A review on hot cathode ionisation gauges with focus on a suitable design for measurement accuracy and stability (2020) · cites this paper as [17]
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Jousten, K., Boineau, F., Bundaleski, N., Illgen, C., Setina, J., Teodoro, O. M. N. D., Vicar, M., & Wüest, M. (2020) · Vacuum · doi:10.1016/j.vacuum.2020.109545 · Cited by 34 · see citing works
- Authors
- Comşa, G.
- Affiliations
- Institute for Atomic Physics, Bucharest, Romania
- Venue
- Journal of Applied Physics
- Publisher
- AIP Publishing
- Published
- 1966-02-01
- Volume
- 37
- Issue
- 2
- Pages
- 554-556
- ISSN
- 0021-8979
- 1089-7550
- Cited by
- 10
- References
- 0
- Language
- en
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