Other
Scientific paper
Apr 1954
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1954natur.173..684w&link_type=abstract
Nature, Volume 173, Issue 4406, pp. 684-685 (1954).
Other
5
Scientific paper
THE observations by Reimann1 and Lukirski and Ptizyn2 showed that the low rates at which some gases (carbon monoxide, nitrogen and hydrogen) are sorbed by magnesium getters can be increased considerably if the gas molecules are converted into other particles (for example, atoms or ions) by the impact of electrons. The view that this phenomenon is a general one, also existing with other getter and gas combinations, has been supported by some experimental evidence. Haase3, for example, who was the first to use a Knudsen gauge for investigation of getters, observed that barium getters only sorbed gas at pressures between 10-8 and 10-6 mm. mercury if the getter deposit was prepared with extreme care from barium distilled in vacuo three times and afterwards evaporated at the very low pressure of 10-8 mm. Even under these stringent conditions, the gettering-rates obtained were of the order of only 10 cm.3/sec. for a getter area of 120 cm.2. This result appeared to show that gettering-rates of the order of 1,000 cm.3/ sec., as observed when measuring with ionization gauges at such low pressures4, are mainly due to the electron impact occurring in those gauges.
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