NDLI: Photon detection based on pulsed laser-enhanced ionization and photoionization of magnesium vapour: experimental characterization

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Photon detection based on pulsed laser-enhanced ionization and photoionization of magnesium vapour: experimental characterization

Content Provider	Royal Society of Chemistry (RSC)
Author	Winefordner, James D. Petrucci, Giuseppe A. Badini, Raúl G.
Copyright Year	1992
Abstract	A resonance ionization detector (RID) based on the two-step laser-enhanced ionization of Mg in a miniature air–acetylene flame is described. The detector utilizes the 285.213 nm resonance absorption of Mg as the signal transition, i.e., photons to be measured. Magnesium atoms excited by absorption of photons at 285.2 nm were further excited to higher lying energy states by absorption of photons at 571.2 or 435.2 nm, from which collisional ionization could occur, or by absorption of photons at 300.9 nm, which directly ionized the excited Mg atoms via an autoionizing level above the ionization continuum. The miniature flame used (about 2 mm in diameter) had very low noise characteristics and the minimum detectable number of photons (MDP) was limited, in some instances, by the noise of the transimpedance amplifier used. The lowest MDP, obtained for the excitation scheme 3s21S (285.2 nm)→3p 1P0(435.2 nm)→6d 1D, was experimentally determined to be 1 × 103(7 × 10–16 J). The quantum efficiency of this excitation scheme, defined as the number of electrons created per photon absorbed at the signal transition (285.2 nm), was found to be 0.75. The spectral response bandwidth of the detector in the signal transition was determined to be mostly Lorentzian in nature, owing to pressure broadening in the atmospheric pressure flame, with a stray light rejection ratio of approximately 1 × 10–5 at 100 cm–1 displacement from the absorption maximum of the RID at 285.213 nm. An application of the RID is given in the detection of weak Raman scatter of carbon tetrachloride, chloroform and dimethyl sulfoxide.
Starting Page	481
Ending Page	491
Page Count	11
File Format	PDF
ISSN	02679477
Volume Number	7
Issue Number	3
Journal	Journal of Analytical Atomic Spectrometry
DOI	10.1039/JA9920700481
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	MDP Raman Resonance Ionization Signal transition Magnesium Transconductance Amplifier Quantum tunnelling Photon Spectral line Atmospheric pressure Carbon tetrachloride Chloroform Dimethyl sulfoxide
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Analytical Chemistry

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