The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 28, 1998
Filed:
Nov. 07, 1996
NEC Corporation, Tokyo, JP;
Abstract
In a mass spectrometer, a DC power supply amplifier is additionally provided in a circuit for generating an accelerating voltage of an electron beam for ionizing radicals. A 'potential for ionization of radicals' is applied as a reference voltage of the accelerating voltage of the radical ionizing electron beam, and an output signal of the mass spectrometer is measured as a background signal strength. Then, the DC power supply amplifier is controlled to alternately supply the 'potential for ionization of radicals' and a 'potential slightly lower than a potential for dissociative ionization of parent gas or dissociative ionization of parent radicals', as the accelerating voltage of the radical ionizing electron beam. A difference between the background signal strength and the output signal of the mass spectrometer when the 'potential slightly lower than a potential for dissociative ionization of parent gas or dissociative ionization of parent radicals' is applied as the accelerating voltage of the radical ionizing electron beam, reflects the density of radicals.