A process for the assessment of the soiling of a maldi - ion source in a mass spectrometer

摘要

The invention relates to a method, the operator of a mass spectrometer with a maldi - ion source, which, in particular with a temporally delayed extraction of the ions, an auxiliary means for determining a contamination is intended to give to the hand; in particular in order to determine when a cleaning of the ion source is offered. The method comprises the receiving at least one mass spectrum of ions, which in the ion source can be produced, the detection of at least one characteristic value for in each case at least two masses signals in the mass spectrum, and determining a the urgency of the cleaning of the ion source code number indicating from the ratio of the property values of at least two masses signals. The present invention also relates to a mass spectrometer with a corresponding characteristic of adjustable maldi - ion source strength sodium.