Examination of the Feasibility of Detection of Calcium Evaporation from a Type B Dispenser Cathode by Laser Induced Phenomena.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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Three methods, laser induced resonance fluorescence, excitation to a shorter lived level from a metastable level, ionization spectroscopy are examined for feasibility of detecting and measuring calcium evaporation from a type of cathode. Laser induced fluorescence is the most promising and the easiest to implement. Ionization of the calcium atoms after they have been excited by a laser to the metastable 3P1 state is feasible but require redesign of extant equipment to implement. Excitation to a shorter lived level from the metastable 3P1 state is feasible for the transition form the 3D24435A kevek abd bit feasubke fir tge 3S1 6122A transition. Sensitized fluorescence and stimulated emission involving excited calcium atoms is examined and discarded. Calcium evaporation rates are semiquantitatively related to barium evaporation rates. An argument for switching the course of future experiments from evaporation rate vs lifetime studies to evaporation rate vs temperature is made.
- Physical Chemistry
- Electrical and Electronic Equipment
- Lasers and Masers
- Electricity and Magnetism