| 摘要 |
PROBLEM TO BE SOLVED: To provide an ion-optical system consisting of a closed track to meet at least the fivefold converging condition even if the C-value of two troidal electric fields is other than one. SOLUTION: An ion-optical system of a time-of-flight mass spectrometer uses the first 1 and the second troidal electric field 2 which are identical and is equipped with quadripolar lenses 5, 6, 7, 8 consisting of a closed track 4 intersecting at one point 3 and converging flying ions having one identical mass spatially on straight tracks 4a, 4b, 4c, 4b between the intersecting point 3 and the first 1 and second troidal electric fields 2. The C-valve expressed by C=r0 /R and the rotational angle We of the first 1 and second troidal electric fields 2 are set as having a specified relationship so as to cause energy convergence temporarily, where r0 is the radius of the central track of ion while R is the curvature of an equipotential surface on a plane perpendicularly intersecting the track plane. |
