Miniaturized two sector field analyzer for complex electro-spray source mixture separation and ion-CCD visualization prior to micro-array simultaneous deposition
EMSL Project ID
36794
Abstract
My research interest will explore the feasibility of fusing a miniaturized double focusing tandem sector field to an ESI type source for simultaneous dual functionality, first, simultaneous separation of complex mixtures, and second, hyperthermal deposition in a micro array fashion. Being pressure independent, the Ion-CCD would be suitable in harsh-environment operations making it ideal for ion-beam characterization. This said, The Ion-CCD would be mounted directly after the collisional and resolving quadrupole to monitor the respective beam profiles. My proposed system will be a small part of the full OI Analytical transportable mass spectrometer. Such a "stand-alone" analyzer will contain a 100-mm wide object-slit plate, a 5-cm radius electrostatic analyzer (ESA) and a 1-Tesla permanent magnet with a 1.5-mm "ion-fly" gap. Located on the focal plane of the analyzer is a 5-cm long Ion-CCD type detector used to detect simultaneously the separated compounds focused in ~ 1500 x 300-mm2 spots along the analyzer focal plane. The Ion-CCD is an array detector containing 2136 active pixels, each with a 21-mm width and 3-mm spacing, and hence with a 24-mm pitch.
The Ion-CCD generates mass spectra of the simultaneously detected ions as frames with intensities proportional to the Ion-CCD exposure time. The maximum rate of the detector operation is 360-frames/sec. The detector has a very good linear response as function of beam intensity as well as exposure time or CCD integration time. The exposure or integration time can be set between 80 ms and 5 sec producing a signal amplification of about 4 orders of magnitude. The whole analyzer together with the ion-CCD will occupy a volume of 6 cm x 12 cm x 24 cm (H x W x L), just the right dimensions to fit in vacuum chambers where most commercial quadrupole mass filters are used.
Project Details
Project type
Limited Scope
Start Date
2009-09-14
End Date
2009-11-14
Status
Closed
Released Data Link
Team
Principal Investigator
Related Publications
Hadjar O, GE Johnson, SM Shill, G Kibelka, K Kuhn, and J Laskin. 2010. "IonCCD for direct position-sensitive charged particle detection: from electrons and keV ions to hyperthermal biomolecular ions." PNNL-SA-74824, Pacific Northwest National Laboratory, Richland, WA.