Patent ID: 7939799

Claim:
A tandem Fourier transform ion cyclotron resonance mass spectrometer comprising: an ionization source for ionizing a sample and ejecting ions; a skimmer for maintaining a vacuum state for the ions ejected from the ionization source; a first ion guide for transmitting the ions inflowed through the skimmer; a FT-ICR mass analyzer for selecting the ions with a specific mass among the ions inflowed through the first ion guide, and measuring the mass of fragment ions of the selected ions; a second ion guide for transmitting the ions selected by the FT-ICR mass analyzer; a collision cell for colliding the selected ions inflowed through the second ion guide with a collision gas injected through a collision gas injection port to generate the fragment ions and transmitting the fragment ions to the FT-ICR mass analyzer through the second ion guide; and a vacuum pump for maintaining a vacuum state in the interior of the ionization source, the skimmer, the first ion guide, the FT-ICR mass analyzer, the second ion guide, the collision gas injection port and the collision cell.