Myoung Choul
Myoung Choul Choi, Ochang-Myeon KR
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20090166533 | FOURIER TRANSFORM ION CYCLOTRON RESONANCE MASS SPECTROMETER USING A CRYO-DETECTION SYSTEM - A Fourier transform ion cyclotron resonance mass spectrometer (FT-ICR MS) is provided. A preamplifier is installed as nearest to an ion cyclotron resonance (ICR) trap as possible at a detector part in the mass spectrometer, and thermal noise generated at the preamplifier is minimized by means of a cryo-cooling system to increase a signal-to-noise ratio of ion detection signals such that an ultra-low amount of specimen can be detected, which was impossible in the related art. | 07-02-2009 |
Myoung Choul Choi, Seoul KR
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20090008549 | Tandem Fourier Transform Ion Cyclotron Resonance Mass Spectrometer - A tandem Fourier transform ion cyclotron resonance mass spectrometer is provided. In the mass spectrometer, the ions selected by a FT-ICR mass analyzer, which can perform an ion selection process and a mass measurement process with a time interval between the processes, are transmitted through an ion guide to a collision cell, which is located a predetermined distance from the FT-ICR mass analyzer, to split into fragment ions. The fragment ions are transmitted to the FT-ICR mass analyzer that measures the mass of the fragment ions. The fragment ions are generated in the collision cell | 01-08-2009 |
20090039254 | 3-DIMENSIONAL DIFFERENTIAL PUMPING SYSTEM AND METHOD THEREOF - A differential pumping system in which a vacuum chamber is manufactured to have a plurality of vacuum pumps and conductance limit plates between the vacuum pumps. The differential pumping system in which an ion is implanted from an ionization source, passes through the vacuum chamber and is detected by a detection unit includes a plurality of vacuum pumps in the vacuum chamber and one or more conductance limit plates between the vacuum pumps, and the conductance limit plates form an angle less than 90° with the transmission direction of the ion. According to such a constitution, higher degree of vacuum and the ion transmission efficiency are maintained without increasing the length of the vacuum chamber. Furthermore, it is possible to minimize the attenuation of an ion detection signal due to a collision with a neighboring neutral molecule, improving the sensitivity of an ion detection device. | 02-12-2009 |
20110114834 | High Throughput Apparatus and Method for Multiple Sample Analysis - A high throughput apparatus for multiple sample analysis is disclosed. The high throughput apparatus for multiple sample analysis may include: a laser light source; a lens array configured to focus laser irradiated by the laser light source into a plurality of focused laser beams; and a focusing unit disposed between the lens array and a sample, the focusing unit configured to focus ions produced from the sample by the plurality of focused laser beams into a plurality of ion beams. A high throughput method for multiple sample analysis may include: producing a plurality of focused laser beams by focusing laser; ionizing a sample by irradiating the plurality of focused laser beams to the sample; and producing a plurality of ion beams by focusing ions, wherein the ions are produced from the sample by the plurality of focused laser beams. | 05-19-2011 |
Myoung Choul Choi, Chungbuk KR
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20130112864 | CONTROLLER AND CONTROL METHOD FOR IMPROVING SIGNAL PERFORMANCE OF ION CYCLOTRON RESONANCE MASS SPECTROMETER - Provided are a controller and a control method for improving signal performance of an ion cyclotron resonance mass spectrometer. The controller and control method apply electric signals for causing ions injected into an ion trap of the ion cyclotron resonance mass spectrometer to be injected to the center of the trap as close as possible to trap electrodes, and adjust biased ion motion by appropriately adjusting signals of trap electrodes for causing the injected ions to make ion motion, thereby improving the fidelity of ion signals. The control method for improving signal performance of an ion cyclotron resonance mass spectrometer includes an ion position adjustment process and an ion signal detection process. | 05-09-2013 |
Myoung Choul Choi, Cheongwon-Gun KR
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20130228681 | FOURIER TRANSFORM ION CYCLOTRON RESONANCE MASS SPECTROMETER AND METHOD FOR CONCENTRATING IONS FOR FOURIER TRANSFORM ION CYCLOTRON RESONANCE MASS SPECTROMETRY - A Fourier transform ion cyclotron resonance mass spectrometer (FT-ICR MS) includes: an ionization source generating ions; a deceleration lens, on which the ions generated by the ionization source and spatially dispersed are incident, selectively decelerating the incident ions so as to decrease the distance between the ions; and an ion cyclotron resonance cell on which the ions passing through the deceleration lens are incident. By preventing dispersing of ions due to mass difference and converging the ions using the deceleration lens, the mass range that can be measured at one time can be extended. Also, measurement sensitivity can be improved since the ions are effectively introduced to the ICR cell. | 09-05-2013 |
20140284470 | LENS FOR ELECTRON CAPTURE DISSOCIATION, FOURIER TRANSFORM ION CYCLOTRON RESONANCE MASS SPECTROMETER COMPRISING THE SAME AND METHOD FOR IMPROVING SIGNAL OF FOURIER TRANSFORM ION CYCLOTRON RESONANCE MASS SPECTROMETER - A lens for electron capture dissociation may include: a first electrode and a second electrode spaced apart from each other and arranged along a first direction; and a third electrode and a fourth electrode spaced apart from each other and arranged along a second direction perpendicular to the first direction. The first electrode and the second electrode may be disposed in a space in which a magnetic field is formed in the first direction and trap electrons. The third electrode and the fourth electrode may be in the form of a flat plate and may apply an electric field to the trapped electrons in the second direction. | 09-25-2014 |