公开(公告)号：US5177359A

公开(公告)日：1993-01-05

申请号：US781507

申请日：1991-10-22

申请人： Seiji Hiroki ,  Tetsuya Abe ,  Koji Yanagishita ,  Nobuhiko Tsuchiya ,  Yoshio Murakami

发明人： Seiji Hiroki ,  Tetsuya Abe ,  Koji Yanagishita ,  Nobuhiko Tsuchiya ,  Yoshio Murakami

IPC分类号： G01N27/62 ,  H01J49/42

CPC分类号： H01J49/42

摘要： In a quadrupole mass spectrometer which includes four parallel rod electrodes between opposite pairs of which overlapping voltages.+-.(U+V cos .omega. t) are applied (where U: a continuous voltage and V cos .omega. t: a radio-frequency voltage) and which effects mass-analysis by an electric field formed within the four parallel rod electrodes, at least one parameter of U, V and .omega. has two different values, and the values are changed over to select the first stable region or the second stable region, the first stable region being nearest to the original point and the second stable region being next near to the original point on the a - q plane (where a:ordinate, q:abscissa) showing "stability diagram", and the ions being able to pass through the four parallel electrodes under the conditions of the first and second stable regions, where the variable a=8eU/mr.sub.O.sup.2 .omega..sup.2, q=4eV/mr.sub.O.sup.2 .omega..sup.2, U: level of DC voltage, V: peak of the radio-frequency voltage, e: charge of ion, m:mass of ion, r.sub.O : radius of an inscribed circle of the four parallel rod electrodes and.omega.: angular frequency of the radio frequency voltage.

摘要翻译： 在四极质谱仪中，包括四个平行的棒状电极，在相对的两对之间施加重叠电压+/-（U + Vcosω），其中U：连续电压和Vcosωt：射频电压）和 其通过形成在四个平行杆电极内的电场进行质量分析，U，V和ω的至少一个参数具有两个不同的值，并且将值改变以选择第一稳定区域或第二稳定区域， 第一稳定区域最接近于原始点，而第二稳定区域靠近a-q平面上原始点（其中a：纵坐标，q：横坐标）显示“稳定性图”，并且离子能够 在第一和第二稳定区域的条件下通过四个平行电极，其中变量a = 8eU /mrO2ω2，q = 4eV /mrO2ω2，U：直流电压电平，V： 频率电压，e：离子电荷，m：离子质量，r0：r 四个平行杆电极的内切圆的像素和ω：射频电压的角频率。