Sealed-cell mercury resonance ionization imaging detector

Pappas, Dimitri; Matveev, O. I.; Smith, Benjamin W.; Shepard, M. R.; Podshivalov, A. A.; Winefordner, J. D.

doi:10.1364/ao.39.004911

Cited by 12 publications

(3 citation statements)

References 15 publications

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“…The configuration and detailed principle of operation of the RIID are described elsewhere. [1][2][3][4] Briefly, the detector, consisting of a partially metal coated input window and a microchannel plate coupled with a P20 phosphor screen, was assembled in a six-way cross-vacuum chamber. The chamber was evacuated to a pressure of ϳ1 torr.…”

Section: Methodsmentioning

confidence: 99%

“…The figure of merit of these detectors as well as their potential applications have been extensively discussed. 1 An RIID based on Hg vapor was first described by Matveev et al 2 and subsequently optimized by Pappas et al 3 Recently, another RIID using Cs as an active element was successfully demonstrated and its operational characteristics were evaluated. 4 The present note, as a continuation of the RIID development, describes a detector with two active elements (Cs and Hg), which exhibits dual-wavelength detection capability.…”

Section: Introductionmentioning

confidence: 99%

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Dual-Wavelength Time-Resolved Resonance Ionization Imaging with Cesium and Mercury Vapors

et al. 2004

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dual-Wavelength Time-Resolved Resonance Ionization Imaging with Cesium and Mercury Vapors

et al. 2004

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“…Several imaging detectors based on the uorescence or ionization of m ercury have been reported. [8][9][10][11][12][13] M atveev et al 10 have used a resonance uorescence imaging monochrom ator (RFIM ) to create two-dimensional images using two-step excitation in m ercury vapor. Finkelstein et al 8 and M iles et al 9 have demonstrated a one-step mercury imaging detector for rotational Raman imaging.…”

Section: Introductionmentioning

confidence: 99%

Sub-Doppler Spectral Resolution and Improved Sensitivity in a Cesium Resonance Fluorescence Imaging Monochromator

et al. 2002

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Improvements in spectral resolution and sensitivity of a cesium based resonance fluorescence imaging monochromator (RFIM) are described. Alignment of the two lasers used in the excitation scheme in a co-propagating geometry have resulted in a detector spectral bandpass (270 MHz) that is narrower than the Doppler broadened profile (380 MHz) of cesium vapor at room temperature. Improvements in the experimental design, namely the addition of an image intensifier and cooled charge-coupled device (CCD) camera, have resulted in increased sensitivity; we report a limit of detection of 108 photons per pixel limited by image intensifier noise. Images of the cesium D2 line emission (852.12 nm) from a cesium hollow cathode lamp were compared to an argon emission line (4Sº1/2 → 4P3/2) at 852.14 nm from a silver/argon hollow cathode lamp as a demonstration of the spectral resolution. The ability of the RFIM to discriminate between photons exciting the F = 4 vs. F = 3 ground state hyperfine level (a frequency difference of 9.2 GHz) of the cesium 62S1/2 state was also investigated to further demonstrate the spectral selectivity. The potential use of the described RFIM for chemical imaging applications is discussed.

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Laser Spectrometric Techniques in Analytical Atomic Spectrometry

Axner

Galbács

2012

Encyclopedia of Analytical Chemistry

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The main purpose of this article is to describe the theory, instrumentation, and analytical performance of laser analytical atomic spectrometry, focusing on absorption, fluorescence, and ionization techniques. The structure of the article is such that it first provides an outline of the theory of light‐matter interactions that prevail for each type of technique as well as of the most common modulation techniques, primarily, wavelength modulation (WM). This is followed by a section that covers the most important types of instrumentation used. The article finally provides a detailed discussion on the specific instrumentation, mode of operation, use, performance, and applications (both analytical and diagnostic) of each technique. In terms of laser atomic absorption, the focus of the discussion is on the use of approaches to enhance the detection capability by either reducing the amount of noise (as is done by the wavelength modulation absorption spectrometry (WMAS) technique) or by providing an extended interaction length (giving rise to cavity‐enhanced absorption spectrometry (CEAS) techniques in general, and cavity ring‐down spectrometry (CRDS) in particular). Laser atomic fluorescence techniques (often referred to as laser‐excited atomic fluorescence spectrometry ( LEAFS )) as well as laser ionization techniques (termed either laser‐enhanced ionization ( LEI ) or resonance ionization spectrometry ( RIS )) are also covered in some detail. It is shown that several of these techniques are capable of detecting a variety of elements in liquid samples down to low picogram per milliliter (pg mL −1 ) or parts‐per‐trillion (ppt) concentrations and in low femtogram amounts. Also other properties of the techniques, e.g. selectivity and linear dynamic range (LDR), are in general superior to those of conventional (nonlaser‐based techniques).

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Sealed-cell mercury resonance ionization imaging detector

Cited by 12 publications

References 15 publications

Dual-Wavelength Time-Resolved Resonance Ionization Imaging with Cesium and Mercury Vapors

Dual-Wavelength Time-Resolved Resonance Ionization Imaging with Cesium and Mercury Vapors

Sub-Doppler Spectral Resolution and Improved Sensitivity in a Cesium Resonance Fluorescence Imaging Monochromator

Laser Spectrometric Techniques in Analytical Atomic Spectrometry

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