Method for improved mass resolution with a TOF-LD source

Details Method for improved mass resolution with a TOF-LD source Method for improved mass resolution with a TOF-LD source

1996-03-21

1997-06-24

Berman, Jack I.

Radiant energy

Ionic separation or analysis

Ion beam pulsing means with detector synchronizing means

250282, H01J 4940

Patent

active

056419597

ABSTRACT:
The invention relates to the use of a time-of-flight mass spectrometer to analyze substance molecules which are ionized by laser desorption, particularly by matrix-assisted laser desorption (MALDI). In detail it relates to the process for improving mass resolution by the known method of delayed acceleration of the ions in the space in front of the sample support plate. The invention consists of switching the potential of an intermediate electrode which is located at a short distance in front of the sample support plate, instead of switching the potential of the sample support plate itself.

REFERENCES:
patent: 4442354 (1984-04-01), Hurst et al.
patent: 5032722 (1991-07-01), Boesl et al.
patent: 5160840 (1992-11-01), Vestal
patent: 5210412 (1993-05-01), Levis et al.
patent: 5510613 (1996-04-01), Reilly et al.
W. C. Wiley et al., Time-of-Flight Mass Spectrometer with Improved Resolution, The Review of Scientific Instruments, vol. 26, No. 12, pp. 1150-1157, Dec. 1995.
Johann M. Grundwurmer et al., High-resolution mass spectrometry in a linear time-of-flight mass spectrometer, International Journal of Mass Spectrometry and Ion Processes, vol. 131, pp. 139-148, 1994.
Eric D. Erickson et al., Mass Dependence of Time-Lag Focusing in Time-of-Flight Mass Spectrometry--An Analysis, International Journal of Mass Spectrometry and Ion Processes, vol. 97, pp. 87-106, 1990.

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