PURPOSE: To obtain stable ion intensity for a long duration by putting a beam on the rear side of a holder plate of a sample holder to reinforce the holder plate and suppress the strain of the holder plate.
CONSTITUTION: A beam 4 for reinforcement is put in the rear side of a sample holder plate 2. That is, a metal plate 2 made of Ta is put in a metal frame 1 made of a stainless steel and windows 3 are opened and a stick 4 made of a stainless steel is so arranged in the way like a lattice as to cross the peripheris of the windows 3 in the rear side and welded to the sample holder plate 2 to give a sample holder. As a result, the strain is suppressed to the minimum level. Consequently, the measured ion intensity does not become uneven and stable measurement is carried out for a long duration.
YOKOI HIDETO
TAKASE HIROMITSU
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