Upgrade of a Raman Spectrometer

Hansen, Susanne Brunsgaard; Berg, Rolf W.; Stenby, Erling Halfdan

doi:10.1081/asr-200030198

Cited by 6 publications

(4 citation statements)

References 7 publications

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“…The signals are numerically stitched together, so the entire 0–4000 cm –1 range is observed simultaneously. Detectors are calibrated by recording FSRS of a 1:1 (v/v) toluene/acetonitrile mixture with accurately known Raman spectrum …”

Section: Experimental and Computational Techniquesmentioning

confidence: 99%

“…Detectors are calibrated by recording FSRS of a 1:1 (v/v) toluene/acetonitrile mixture with accurately known Raman spectrum. 32 In present experiments, the probe beam was focused to a spot of ∼40 μm diameter at the sample and overlapped with ∼100 μm Raman and actinic pump beams. The delay of the actinic pump was scanned from 200 ps before to 6 ns after the arrival of the FSRS probe in 134 logarithmically distributed delay times, providing approximately 8 time points for each doubling of the delay time.…”

Section: ■ Introductionmentioning

confidence: 99%

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Time-Resolved Femtosecond Stimulated Raman Spectra and DFT Anharmonic Vibrational Analysis of an Electronically Excited Rhenium Photosensitizer

et al. 2020

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Time-resolved femtosecond stimulated Raman spectra (FSRS) of a prototypical organometallic photosensitizer/photocatalyst ReCl(CO) 3 (2,2'-bipyridine) were measured in a broad spectral range ~40-2000 (4000) cm-1 at time delays from 40 fs to 4 ns after 400 nm excitation of the lowest allowed electronic transition. Theoretical ground-and excited-state Raman spectra were obtained by anharmonic vibrational analysis using second-order vibrational perturbation theory on vibrations calculated by harmonic approximation at DFT-optimized structures. A good match with anharmonically calculated vibrational frequencies allowed for assigning experimental Raman features to particular vibrations. Observed frequency shifts upon excitation ((ReCl) and (CC interring) vibrations upwards; (CC, CN) and (Re-C) downwards) are consistent with the bonding/antibonding characters of HOMO and LUMO involved in the excitation and support the delocalized formulation of the lowest triplet state as ReCl(CO) 3 bpy charge-transfer. FSRS

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Section: Experimental and Computational Techniquesmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Time-Resolved Femtosecond Stimulated Raman Spectra and DFT Anharmonic Vibrational Analysis of an Electronically Excited Rhenium Photosensitizer

et al. 2020

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“…The wavenumber calibration of the spectrometer was performed using the spectrum of pure CH 4 at a pressure of 0.1 MPa according to the procedure described by Brunsgaard Hansen [ 47 ]. However, the most intense lines of the ν 3 band from data of Berger [ 48 ] were taken as reference lines, instead of the emission lines of a neon lamp.…”

Section: Methodsmentioning

confidence: 99%

Depolarization Ratio of the ν1 Raman Band of Pure CH4 and Perturbed by N2 and CO2

Tanichev

Petrov

2021

Molecules

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In this work, the effect of nitrogen and carbon dioxide on the depolarization ratio of the ν1 band of methane in the pressure range of 0.1–5 MPa is studied. A high-sensitivity single-pass Raman spectrometer was used to obtain accurate results. Moreover, we took into account the overlap of the ν1 band by the ν3 and ν2 + ν4 bands using the simulation of their spectra. The depolarization ratio of the ν1 band in pure methane is within 0–0.001, and the effect of nitrogen and carbon dioxide on this parameter is negligible in the indicated pressure range. The obtained results are useful for correct simulation of the Raman spectrum of methane at different pressures, which is necessary to improve the accuracy of gas analysis methods using Raman spectroscopy.

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“…A conventional single channel JEOL spectrometer was upgraded by implementing a modern CCD multi-channel detector, to allow a spectrum to be obtained within a few seconds (described in detail in Ref. 4). We applied two optical fibers (each with a length of 10 m) and a homemade Raman head to obtain spectra of samples at different places (altitudes).…”

Section: Methodsmentioning

confidence: 99%

Diffusion Measurements in Binary Liquid Mixtures by Raman Spectroscopy

Berg

Hansen²,

Shapiro³

et al. 2007

Appl Spectrosc

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It is shown that Raman spectroscopy allows determination of the molar fractions in mixtures subjected to molecular diffusion. Spectra of three binary systems, benzene/n-hexane, benzene/cyclohexane, and benzene/acetone, were obtained during vertical (exchange) diffusion at several different heights (z) as a function of time. A procedure to determine time-dependent concentration profiles and diffusion coefficients is described in detail for one system, and results are given for the two other cases. For the system benzene/cyclohexane, much lower diffusion coefficients than reported in the literature were found, even in a thermostatically controlled diffusion cell, recording spectra through circulating water. For the system benzene/acetone, the determined diffusion coefficients were in good agreement with the literature data. The limitations of the Raman method are discussed, and it is concluded that many more systems ought to be studied. It is pointed out that diffusion profiles can be obtained in ternary and higher systems, where proper measurements are almost nonexistent.

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Upgrade of a Raman Spectrometer

Cited by 6 publications

References 7 publications

Time-Resolved Femtosecond Stimulated Raman Spectra and DFT Anharmonic Vibrational Analysis of an Electronically Excited Rhenium Photosensitizer

Time-Resolved Femtosecond Stimulated Raman Spectra and DFT Anharmonic Vibrational Analysis of an Electronically Excited Rhenium Photosensitizer

Depolarization Ratio of the ν1 Raman Band of Pure CH4 and Perturbed by N2 and CO2

Diffusion Measurements in Binary Liquid Mixtures by Raman Spectroscopy

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