Dual-beam Fourier transform infrared spectrometer

Kuehl, Donald; Griffiths, Peter R.

doi:10.1021/ac50025a016

Cited by 35 publications

(20 citation statements)

References 5 publications

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“…The authors used the Kretchmann's ATR technique to observe the surface enhanced IR absorption (SEIRA) phenomenon but it is has been observed also in the transmission and external reflection geometries [3,4]. Since IR spectra of a small amount of molecules (pg~ tg) are obtained in good signal-to-noise ratios, the SEIRA spectroscopy is promising as a new trace analytical technique [4,5]. Unfortunately, however, its mechanism has not yet been understood.…”

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confidence: 99%

Surface Enhanced Infrared Absorption Spectroscopy

et al. 1991

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Infrared (IR) absorption of molecules is enhanced , greatly (101-103 times) when they are adsorbed on or near vacuum-evaporated Ag or Au thin films. By using this surface Enhanced i$ absorption (SEIRA) phenomenon, we could obtained IR spectra of some organic molecules of a few picogram amount in good signal-to-noise ratios. Thus, the SEIRA spectroscopy is promising as a new trace analytical technique. General properties of SEIRA found in our experiments are summarized . An electromagnetic theory of this phenomenon is proposed. Key W surface enhanced infrared spectroscopy, trace analysisOptical properties of molecules are altered dramatically when they are adsorbed on or near some rough metal surfaces. Surface enhanced Raman scattering (SERS) [1] is the most prominent example. Similar surface enhanced

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confidence: 99%

Surface Enhanced Infrared Absorption Spectroscopy

et al. 1991

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“…He utilized both the interferogram and the anti-interferogram beam produced by an FTIR spectrometer and measured the resulting difference signal with a balanced detector. Later works inserted a reference and a sample into each beam and focused both outputs on a single detector [2,3], which results in the cancellation of the common AC-components of the opposing interferograms. In doing so, the effect of excess source noise on the detection limit can be in principle suppressed down to the shot-noise level of the source [4].…”

Section: Introductionmentioning

confidence: 99%

“…Because sequential measurements of sample and reference signal become unnecessary, the measurement time and systematic errors are reduced and the dynamic range requirements of the digitization electronics are relaxed [5]. However, none of the various dual-beam FTIR schemes [1][2][3][4][5][6], addressed the issue of the limited dynamic range of the detector because the DC-component of the interferograms was always present. In contrast, optically subtracting a reference signal before detection spatially isolates the sought-for signal, disclosing it in front of a quasi-zero background.…”

Section: Introductionmentioning

confidence: 99%

Broadband interferometric subtraction of optical fields

Buberl¹,

Sulzer²,

Leitenstorfer³

et al. 2019

Opt. Express

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We present a Mach-Zehnder-like interferometer capable of simultaneous superoctave (950-2100 nm) destructive interference with an intensity extinction of 4 × 10 −4. Achromatic nulling is achieved by unbalancing the number of Fresnel reflections off optically denser media in the two interferometer arms. With a methane gas sample in one interferometer arm, we isolate the coherent molecular vibrational emission from the broadband, impulsive excitation and quantitatively examine the potential improvement in detectable concentration, compared to direct transmission geometry. The novel concept will benefit sensing applications requiring high detection sensitivity and dynamic range, including time-domain and frequency-domain spectroscopy.

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“…1,2 A photoconductive (PC) type HgCdTe (MCT) detector is the typical high sensitive IR detector well installed for versatile FTIR spectrometers according These improvements owe to two nominal merits of a FTIR spectrometer.…”

Section: Introductionmentioning

confidence: 99%