Patent Number: 
Section: claims

1. A charged particle beam apparatus comprising a detector that detects a charged particle released from a sample that is irradiated by a charged particle beam, and a vacuum chamber that surrounds the sample that was irradiated by the charged particle beam,wherein a lubricant that underwent heat purification at a temperature greater than or equal to 80° C. and less than 220° C. inside a vacuum is coated on a sliding part of a sliding member disposed inside the vacuum chamber. 2. The charged particle beam apparatus according to claim 1, wherein the lubricant includes a fluorochemical compound. 3. The charged particle beam apparatus according to claim 2, wherein the fluorochemical compound includes perfluoropolyether. 4. The charged particle beam apparatus according to claim 2, wherein the lubricant is a substance from which a part of CF3, C2F5, and/or C3F7 was removed by the heat purification. 5. The charged particle beam apparatus according to claim 1, wherein the lubricant includes a hydrocarbon compound. 6. The charged particle beam apparatus according to claim 1, wherein a kinetic viscosity of the lubricant is 400 to 700 mm2/s. 7. A charged particle beam apparatus comprising a detector that detects a charged particle released from a sample that is irradiated by a charged particle beam, and a vacuum chamber that surrounds the sample that was irradiated by the charged particle beam,wherein a lubricant including perfluoropolyether is coated on a sliding part of a sliding member disposed inside the vacuum chamber and the lubricant has a kinetic viscosity of 400 to 700 mm2/s and is a substance that is obtained after undergoing a process that removes a part of CF3, C2F5, and/or C3F7. 8. The charged particle beam apparatus according to claim 7, wherein the part of CF3, C2F5, and/or C3F7 is removed by heat purification at a temperature greater than or equal to 80° C. and less than 220° C. inside a vacuum.