Metastable CID
Systems and methods of generating ions at atmospheric pressure are presented. These systems and methods include spatially dependent analysis of a sample using an effusive ionization source. Systems and methods of isolating samples at atmospheric pressure are presented. These systems and methods include using a barrier to prevent metastables or electrons from an effusive ion source from reaching a sample unless the sample is in an analysis position. Systems and methods of using metastables in collisionally induced dissociation are presented.
1 . A system comprising:
a first m/z analyzer configured to analyze ions according to their m/z values;
an effusive source of excited metastables; and
a collision induced dissociation region configured to receive the excited metastables, and configured to facilitate collisions between the ions and the excited metastables, the collisions resulting in generation of product ions from the ions.
2 . The system of claim 1 , further including an interface disposed between the effusive source of excited metastables and the collision induced dissociation region, the interface being configured to maintain the collision induced dissociation region at a lower pressure than the effusive source.
3 . The system of claim 1 , wherein the effusive source is configured to be operated at greater than 50 Torr and the collision induced dissociation region is configured to be operated at less than 50 Torr.
4 . The system of claim 1 , wherein the effusive source is configured to be operated at greater than 100 Torr and the collision induced dissociation region is configured to be operated at less than 100 Torr.
5 . The system of claim 1 , further including a second m/z analyzer configured to analyze the product ions.
6 . The system of claim 1 , wherein the first m/z analyzer is further configured to analyze the product ions.
7 . The system of claim 1 , wherein the first m/z analyzer includes an ion trap.
8 . The system of claim 1 , wherein the first m/z analyzer is configured to separate the ions as a function of frequency.
9 . The system of claim 1 , wherein the first m/z analyzer is configured to generate a radio frequency electric field.
10 . A system comprising:
an effusive metastable source configured to generate metastables;
a first m/z analyzer configured to separate ions according to m/z values;
a collision induced dissociation region configured to receive the separated ions and the metastables;
a second m/z analyzer configured to receive product ions generated through collisions between the separated ions and the metastables, and to separate the product ions according to their m/z values; and
a detector configured to detect the separated product ions.
11 . The system of claim 10 , further including a valve configured to control a flow of the metastables into the collision induced dissociation region.
12 . The system of claim 10 , further including a skimmer configured for introducing the metastables into the collision induced dissociation region.
13 . The system of claim 10 , further including a data system configured to record a signal generated by the detector and to control introduction of the metastables into the collision induced dissociation region.
14 . The system of claim 10 , further including an interface configured such that the collision induced dissociation region operates at a lower pressure than the effusive metastable source.
15 . The system of claim 10 , wherein the metastables are included in a carrier gas having a pressure greater than 100 Torr.
16 . The system of claim 10 , wherein the metastables are included in a carrier gas having a pressure greater than 100 Torr and the collision induced dissociation region is operated at less than 50 Torr.
17 . The system of claim 10 , wherein the metastables are included in a carrier gas having a pressure greater than 50 Torr and the collision induced dissociation region is operated at less than 50 Torr.
18 . The system of claim 10 , wherein the metastables are included in a carrier gas and have velocities that are dependent on the temperature of the carrier gas.
19 . The system of claim 10 , further including a differentially pumped interface configured such that the collision induced dissociation region operates at a lower pressure than the effusive metastable source.
20 . The system of claim 10 , wherein the second m/z analyzer includes a quadrupole.
21 . A method comprising:
generating excited metastables;
generating first ions;
separating the first ions to produce separated ions;
colliding the separated ions with the metastables to produce product ions; and
separating the product ions.
22 . The method of claim 21 , wherein separating the product ions includes analyzing the product ions to determine their m/z values.
23 . The method of claim 21 , wherein separating the first ions includes separating the ions as a function of their collisional cross-section.
24 . The method of claim 20 , further including varying the internal energy of the excited metastables to vary the product ions produced.
25 . The method of claim 21 , further including varying the external energy of the excited metastables to vary the product ions produced.
26 . The method of claim 21 , wherein the metastables are generated using an effusive metastable source.
27 . The method of claim 21 , wherein the metastables are generated using a DART source.
28 . The method of claim 21 , wherein the product ions are separated using an Orbitrap.
29 . A system comprising:
a passageway configured for a person or an article to pass through;
at least one metastable source configured to generate metastable species;
a first MS inlet configured to receive ions generated as a result of the metastable species striking the person or the article as the person or the article passes through the passageway; and
at least one mass spectrometer configured to receive the ions from the first MS inlet.
30 . The system of claim 29 , further including a metal detector configured to detect metal as the metal passes through the passageway.
31 . The system of claim 29 , further including an x-ray source and an x-ray detector, the x-ray source and the x-ray detector being configured to generate an x-ray image of the person or article as the person or article passes through the passageway.
32 . The system of claim 29 , further including a millimeter-wave scanning device configured to image the person or article in the passageway.