Abstract:
PROBLEM TO BE SOLVED: To provide: a device for measuring a mean free path, which can accurately and simply measure a mean free path of charged particles even at an atmosphere of a degree of poor vacuum and/or an atmosphere of activated gas; a vacuum indicator; and a method for measuring the mean free path. SOLUTION: The device 1007 includes a filament 111 separated from atmospheric gas in a vacuum, an UV transparent type vacuum partition 700 for transmitting vacuum UV light 330, and a vacuum UV light source 600 arranged in the atmospheric gas and having a light/electron conversion electrode 610 which discharges photoelectrons 340 by receiving the vacuum UV light 330. Further, the device 1007 includes: a first collector for detecting the number of first charged particles out of charged particles where a flying distance from the vacuum ultraviolet light source 600 is zero or more; and a second collector for detecting the number of second charged particles out of charged particles at a distance longer than the flying distance of the first charged particles. A control section 1000 of the device 1007 calculates a mean free path from a ratio of the numbers of first and second charged particles. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a quadrupole mass spectrometer capable of performing highly accurate pressure measurement and highly accurate gas analysis simultaneously, and a means dispensing with an ionization vacuum gage by using only the quadrupole mass spectrometer for pressure measurement to be mounted on one vacuum device. SOLUTION: Concerning a quadrupole mass spectrometer Q for measuring a partial pressure intensity classified by the kind of gas in the vacuum device 9 from an ion current intensity, this quadrupole mass spectrometer with a total pressure measuring electrode is provided with the total pressure measuring electrode 1 for surveying an ion density in a demarcated space A formed by a grid electrode 2 and an ion focusing electrode 4. This vacuum device has only the quadrupole mass spectrometer Q mounted thereon for measuring the partial pressure intensity classified by the kind of gas in the vacuum device 9 from the ion current intensity, and does not have the ionization vacuum gage except the quadrupole mass spectrometer. COPYRIGHT: (C)2007,JPO&INPIT