Abstract
A negative-ion creation technique by Rydberg electron capture (REC) is used to ionise 1,2,3,4 tetrachlorodibenzo-p-dioxin (1,2,3,4-TCDD). Negative ions are mass-analysed by a commercial quadrupole mass spectrometer and also by a home-made mass spectrometer using a quadrupole ion trap. From spectra of 1,2,3,4-TCDD a comparison between the REC ionisation technique and two other soft ionisation techniques, electron capture chemical ionisation (ECCI) and the electron monochromator (EM), are discussed.
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