多段式高分解能质量分析器-j-stage.pdf

Vol.14,No.2,June1966 多 段式 高分解能 質 量 分 析 器 A High Resolution Mass Spectrometer With Multi-stage Fields 松 田 久 HISASHI MATSUDA (1966年5月2日受 理) A mass spectrometer which may have very large mass dispersion and resolving power is proposed. Consider the tandem combination of n cylindrical electrostatic analyzers of sector type (opposite deflections to each other)with the same ƒ¿•£•¥,ƒ³•£•¥,and magnification X(1)each,and the tandem combination of n homogeneous magnetic analyzers of sector type(opposite deflections to each other) with the same am,ƒ³m,and magnification 1/X each.These two groups of the fields are connected in tandem so that the deflection in the final electric field and that in the first magnetic field are in the same sense.The double focusing condition is satisfied if ae=am=a.The total magnification of the image is1,while the mass dispersion at the final image is given as follows: Dm=a/2(1+-X/1)(1+X/1+X2/1+•c+Xn-1/1)ƒÁ. If X is very small and n large,then very large mass dispersion and resolving power may be expected.For example,in the case X=1/3,n=3,ae=am=100cm,ƒ³e=63•‹39,ƒ³m=90•‹,mass dispersion of 2600ƒÁcm and resolving power of26,000,000/sƒÊ are expected. 点の座標を(l″″,b″″)とし,扇形場の中で中間像 を結 ば 1.ま え が き ない もの とすると,1次近似では b 電場あるいは磁場か らな る扇形場をい くつか直列に =Xb′十aδ(1十X)(1) 組合せて唯一つの場では実現 し得ない性質をもたせ,