21. In 1964, quadrupole mass spectrometer under the direction of Robert E . Finnigan. 22. Bennett's radio frequency mass spectrometer measured the masses of atoms. 23. These peptides are separated by liquid chromatography en route to a tandem mass spectrometer . 24. In recent decades some manufacturers have produced quadrupole mass spectrometers with true hyperbolic rods. 25. Some gas chromatographs are connected to a mass spectrometer which acts as the detector. 26. Recently, the performance of the Penning trap mass spectrometer ISOLTRAP has been considerably enhanced. 27. Back in the lab, he analyzed the substance on a gas chromatography mass spectrometer . 28. This is what makes it valuable in leak detection : see Helium mass spectrometer . 29. The Analytical Instrumentation Research Institute in Korea also developed a palm portable mass spectrometer . 30. Once operating pressure has been reached, the mass spectrometer can start its measuring operation.
