Method and apparatus for ion mobility spectrometry
a technology of ion mobility and ion beam, which is applied in the field of improved methods and apparatus for ion beam mobility spectrometry, can solve the problems of high false alarm rate for the detection of some chemical and biological hazards, high cost of ms, etc., and achieves the effect of high information content, high information content, and high information content about the sampl
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[0012]FIG. 1 shows a schematic structural view showing of an apparatus for ion mobility spectroscopy with a infrared laser for fragmentation. The sample 1 is injected into the ionization chamber 2 and ionized by the source of ionization 3 which may be e.g. a radioactive source such as 3H, 53Ni, or 241Am, UV or VUV light, or an electrical discharge (non-radioactive electron source). For example, when using a 53Ni foil as source of ionization and air as drift gas, the primary ions are mainly short-living N2+, NO+ and O2−. These N2+, NO+ and O2− rapidly react with traces of water in the drift gas to form clusters of the types N2+(H2O)x, NO+(H2O)y, and O2−(H2O)z, which then cluster with the molecules and clusters of the sample. The ionization chamber 2 serves as ion reservoir. After injection of the sample into the ionization chamber 2, some of the sample molecules and sample ions start to dissociate into fragment molecules and fragment ions due to interaction with the light from an inf...
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