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    • 98. 发明授权
    • METHOD AND APPARATUS FOR MALDI ANALYSIS
    • 方法和装置MALDI分析
    • EP0868740B1
    • 2003-01-15
    • EP97941535.3
    • 1997-09-19
    • SEQUENOM, INC.
    • HILLENKAMP, Franz
    • H01J49/16
    • H01J49/164B01J2219/00387C40B60/14H01J49/0418
    • Matrix assisted laser desorption/ionization is performed in a manner to thermalize large analyte ions in a plume of desorbed material for spectroscopic analysis. The thermalized ions have a low or zero mean velocity and are presented at a well-defined instant in time, reducing artifacts and sharpening the spectral peaks. In one embodiment the light is delivered to a matrix or sample holder having a cover, baffle or compartment. The baffle or compartment impedes or contains a plume of desorbed material and the analyte undergoes collisions to lower its mean velocity and directionality. Thus "thermalized", the analyte ions are passed to a mass analysis instrument. In a preferred embodiment, an optical fiber butts up against a thin transparent plate on which the specimen resides, with the matrix side in a vacuum acceleration chamber. A mechanical stage moves the specimen in both the x- and y-directions to select a point on the specimen which is to receive the radiation. The use of a fiber optic illuminator allows the entire stage assembly to be subsumed essentially within the dimensions of a conventional stage.