Radiant energy – Ion generation – Field ionization type
Patent
1998-05-05
1999-12-28
Nguyen, Kiet T.
Radiant energy
Ion generation
Field ionization type
250397, H01J 3708
Patent
active
060084960
ABSTRACT:
A resonance ionization imaging device (RIID) and method for imaging objects using the RIID are provided, the RIID system including a RIID cell containing an ionizable vapor including monoisotopic atoms or molecules, the cell being positioned to intercept scattered radiation of a resonance wavelength .lambda..sub.1 from the object which is to be detected or imaged, a laser source disposed to illuminate the RIID cell with laser radiation having a wavelength .lambda..sub.2 or wavelengths .lambda..sub.2, .lambda..sub.3 selected to ionize atoms in the cell that are in an excited state by virtue of having absorbed the scattered resonance laser radiation, and a luminescent screen at the back surface of the RIID cell which presents an image of the number and position of charged particles present in the RIID cell as a result of the ionization of the excited state atoms. The method of the invention further includes the step of initially illuminating the object to be detected or imaged with a laser having a wavelength selected such that the object will scatter laser radiation having the resonance wavelength .lambda..sub.1.
REFERENCES:
patent: 5272338 (1993-12-01), Winograd et al.
Matveev Oleg I.
Smith Benjamin W.
Winefordner James D.
Clarke Dennis P.
Nguyen Kiet T.
University of Florida
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