| 摘要 |
PROBLEM TO BE SOLVED: To increase ion concentration of a sample and to make mass spectrometry with high resolution and a high S/N ratio by deflecting an ion beam containing the ionized sample, and feeding the ion beam containing ions with the selected mass to an ion trap type mass spectrometric section. SOLUTION: A mixed sample subject to mass spectrometry is component-separated by a preprocessing system 2, the mixed sample and a solvent are ionized by an ionization section 3, unnecessary ions and neutral molecules are removed by a deflection mass selection section 10, and the mixed sample is fed to an ion trap type mass spectrometric section 5 through a focusing lens system 4. The mass spectrometric section 5 is composed of a ring electrode 51 and end cap electrodes 52, 53 facing each other across the ring electrode 51, and a DC voltage and a high-frequency voltage are applied between the electrodes from a high-frequency voltage power supply 8 to form the quadrupole electric field between the electrodes. An ion beam from the focusing lens system 4 is fed between the ring electrode 51 and the end cap electrodes 52, 53 through a center port 13, is captured by the quadrupole electric field, and is detected by a detector 6 through a center port 55, then a mass spectrum is obtained as the final analysis result.
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