Characteristics And Application of a Laser Ionization/evaporation Source for Tandem Mass Spectrometry
Characteristics And Application of a Laser Ionization/evaporation Source for Tandem Mass Spectrometry
Perchalski, Robert John
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In traces 1-4, Ql is set to filter out all m/z produced by the sample (passing m/z 150) and Q3 is set to pass ions that should be present (passing all m/z above 202 to 210. In trace 5, neither quadrupole is passing ions produced by the sample and they are set to be mutually exclusive (Ql passing m/z 700 and Q3 scanning normally with rod polarity "+" from m/z 300 to 310. Trace 1 is at grid center where phenytoin concentration is low. Trace 2 is at edge of droplet where concentration is highest. ...Traces 3 and 4 are successive shots at site 2. Trace 5 is from an identically prepared grid at the edge of sample droplet . TOTAL ION CURRENT (CNTS) 85 400 - 200 - 86 site on the edge of this ring where concentration was highest. These traces indicate that Ql is not totally efficient at filtering ionic species. Trace 5 was recorded with Ql set to pass m/z 700 and Q3 scanning from m/z 300 to 310 with rod polarity "+" (DC on) so that both quadrupoles were mutually exclusive and neither was passing ions that were produced by the sample.
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