翻訳と辞書 Words near each other ・ Quadruple jump controversy ・ Quadruple play ・ Quadruple product ・ Quadruple reed ・ Quadruple track ・ Quadruple-precision floating-point format ・ Quadruple-stranded DNA ・ Quadruplex ・ Quadruplex telegraph ・ Quadruplex videotape ・ Quadruply clad fiber ・ Quadrupole ・ Quadrupole formula ・ Quadrupole ion trap ・ Quadrupole magnet ・ Quadrupole mass analyzer ・ Quadrupole splitting ・ Quadrus ・ Quadrus cerialis ・ Quadstone Paramics ・ Quadtree ・ Quadtrine Hill ・ Quadwave ・ Quadyuk Island ・ Quadzilla ・ Quaere ・ Quaerendo ・ Quaero ・ Quaesitor ・ Quaesitosaurus Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Quadrupole mass analyzer ： ウィキペディア英語版 Quadrupole mass analyzer The quadrupole mass analyzer (QMS) is one type of mass analyzer used in mass spectrometry. It is also known as a transmission quadrupole mass spectrometer, quadrupole mass filter, or quadrupole mass spectrometer. As the name implies, it consists of four cylindrical rods, set parallel to each other. In a quadrupole mass spectrometer the quadrupole is the component of the instrument responsible for filtering sample ions, based on their mass-to-charge ratio (''m/z''). Ions are separated in a quadrupole based on the stability of their trajectories in the oscillating electric fields that are applied to the rods.〔 ==Principle of operation== The quadrupole consists of four parallel metal rods. Each opposing rod pair is connected together electrically, and a radio frequency (RF) voltage with a DC offset voltage is applied between one pair of rods and the other. Ions travel down the quadrupole between the rods. Only ions of a certain mass-to-charge ratio will reach the detector for a given ratio of voltages: other ions have unstable trajectories and will collide with the rods. This permits selection of an ion with a particular ''m/z'' or allows the operator to scan for a range of ''m/z''-values by continuously varying the applied voltage.〔 Mathematically this can be modeled with the help of the Mathieu differential equation. Ideally, the rods are hyperbolic. Cylindrical rods with a specific ratio of rod diameter-to-spacing provide an easier-to-manufacture adequate approximation to hyperbolas. Small variations in the ratio have large effects on resolution and peak shape. Different manufacturers choose slightly different ratios to fine-tune operating characteristics in context of anticipated application requirements. In recent decades some manufacturers have produced quadrupole mass spectrometers with true hyperbolic rods. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Quadrupole mass analyzer」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.