| Autor: |
P. F. M. Stalmeier, H.H. Tuithof, J. Kistemaker, A.J.H. Boerboom, G.J. Louter |
| Rok vydání: |
1980 |
| Předmět: |
|
| Zdroj: |
International Journal of Mass Spectrometry and Ion Physics. 33:335-347 |
| ISSN: |
0020-7381 |
| DOI: |
10.1016/0020-7381(80)80052-0 |
| Popis: |
A tandem mass spectrometer is described for studies of collision-induced dissociation. This instrument is especially suited for investigations on organic molecules, e.g. biochemical substances, for m/z values up to 1000. The first stage is formed by conventional EI source and a sector magnet, and has a mass resolution of about 600. This first stage is provided with a collision gas cell at the site of the detector slit. In the second stage the fragment ions are post-accelerated in order to reduce the relative energy-spread and to increase the resolution and transmission. The fragment spectrum is analyzed by a second magnet (R = 750 mm, deflection angle = 15°) and simultaneously recorded. Quadrupoles are added in order to vary the dispersion and to aid focussing. The ratio between the highest and lowest masses in a simultaneously detected spectrum may vary from 4 : 1 to 1.06 : 1. The resolution can be as high as 600, and the transmission from the collision cell to the CEMA ranges from 60 to 100%; the detection sensitivity can be as high as 1 ion per 10 s. This very high sensitivity with simultaneous detection offers the possibility of measuring short-lasting phenomena, such as desorption induced by a laser pulse and flash pyrolysis. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
