Multi-dimensional ion mobility spectrometry methods and apparatus
View Patent ↗Various embodiments of a multi-dimensional ion mobility analyzer are disclosed that have more than one drift chamber and can acquire multi-dimensional ion mobility profiles of substances. The drift chambers of this device can, for example, be operated under independent operational conditions to separate charged particles based on their distinguishable chemical/physical properties. The first dimension drift chamber of this device can be used either as a storage device, a reaction chamber, and/or a drift chamber according to the operational mode of the analyzer. Also presented are various methods of operating an ion mobility spectrometer including, but not limited to, a continuous first dimension ionization methods that can enable ionization of all chemical components in the sample regardless their charge affinity.
1. A method for detecting samples using a multidimensional ion mobility spectrometric system, the method comprising:
(a) measuring drift times of ions in a plurality of drift chambers;
(b) detecting ions of a compound of interest in a first drift chamber;
(c) conveying a portion of the ions from the compound of interest from the first drift chamber into a second drift chamber; and
(d) confirming the ions are the compound of interest in the second drift chamber.
2. The method of claim 1 , wherein the multidimensional ion mobility profile is two-dimensional or three dimensional.
3. The method of claim 1 , wherein the multidimensional ion mobility profile simultaneously identifies ions in both positive and negative polarity.
4. The method of claim 1 , wherein the multidimensional ion mobility profile simultaneously identifies ions in a single polarity.
5. The method of claim 1 , further comprises ionizing the samples with a CFDI ionization source.
6. The method of claim 1 , further comprises confirming the ions are the compound of interest in a higher dimension drift tube, in particular, a third, a fourth, and/or a fifth.