Method of removing trace quantities of alkali metal impurities f

Details Method of removing trace quantities of alkali metal impurities f Method of removing trace quantities of alkali metal impurities f

1984-10-09

1986-02-04

Morgenstern, Norman

Coating processes

Electrical product produced

Photoelectric

4273833, 445 11, 445 13, 445 17, H01J 4016

Patent

active

045685673

ABSTRACT:
A method of processing a bialkali-antimonide photoemissive cathode to remove trace quantities of alkali metal impurities is disclosed. The cathode is formed by heating alkali vapor sources comprising the chromates of two alkali materials which include trace impurities of two other alkali materials of higher vapor pressures than the aforementioned two alkali materials to sufficiently high temperatures to produce alkali vapors. The temperature of the substrate onto which the various alkali vapors condense is maintained at a sufficiently high temperature for a sufficiently long period of time to drive off the trace quantities of the higher vapor pressure other alkali materials from the substrate. Additionally, after the alkali vapor sources are heated to temperatures sufficient to vaporize the alkali chromates therein, the temperatures of the sources are lower and maintained at sufficient levels to accelerate the removal of reduced alkali vapors from the sources and from the photomultiplier tube.

REFERENCES:
patent: 2431401 (1947-11-01), Janes
patent: 2676282 (1954-04-01), Polkosky
patent: 2770561 (1956-11-01), Sommer
patent: 2877078 (1959-03-01), Gauthier
patent: 2914690 (1959-11-01), Sommer
patent: 3023131 (1962-02-01), Cassman
patent: 3372967 (1968-03-01), Hughes
patent: 3434876 (1969-03-01), Stoudenheimer et al.
patent: 3535011 (1970-10-01), Matheson et al.
patent: 3658400 (1972-04-01), Helvy
patent: 3838304 (1974-09-01), McDonie
patent: 3884539 (1975-05-01), Sommer
patent: 4376246 (1983-03-01), Butterwick
A. Sommer, Photoemissive Materials, Wiley and Sons, Inc., 1968, pp. 113-124.
Electron Tube Division, RCA Corporation, Electron Tube Design, pp. 366-369, (1962).

Affiliated with

Also associated with

Rating

Method of removing trace quantities of alkali metal impurities f does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of removing trace quantities of alkali metal impurities f, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of removing trace quantities of alkali metal impurities f will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2340060