Patent ID: 9330896
Filing Date: 2016-05-03
CPC Classification: G01N,H01J

Claim Text:
1. A mass spectrometer comprising at least: an ion source having a means to ionize a sample, and a means to introduce pulsed crude ions into a mass analyzer by a predetermined acceleration voltage; an ion introduction unit having a means to focus the flight directions of said crude ions, and/or a means to select out said crude ions which travel toward predetermined directions; said mass analyzer which has a separation space where said crude ions introduced travel and a means to produce in said separation space a one-dimensional high-frequency electric field that acts in the direction (hereafter referred to as y-direction) crossing the incident direction of said crude ions at a predetermined angle, and makes the ionic species having different mass-to-charge ratios with each other travel on different flight paths through the action of said one-dimensional high-frequency electric field; an ion detection unit having a means to detect ions which come to the predetermined position in the y-direction on the exit plane at the end of said separation space; wherein said crude ions are introduced into said separation space as a pulse synchronized with the phase of said one-dimensional high-frequency electric field, and the measured ionic species of a predetermined mass-to-charge ratio(s) exits from said separation space having received the action of said one-dimensional high-frequency electric field for n periods or for the substantially same time as it, and is detected in distinction from the other ionic species based on the position in the y-direction on said exit plane (Here, n stands for a natural number.).