Slit-Function Corrections Applied to Laser-Excited Raman Bands of Liquids

Frenzel, C. A.; Bradley, E. B.; Mathur, M. S.

doi:10.1366/000370271779950968

Cited by 3 publications

(5 citation statements)

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“…Thus, changes to the slit width and/or changes to the IRB width will result in different ORB image spectral irradiances. In contrast to previous publications, [10][11][12][13][14][15][16][17][18] our model shows that changing slit width and changing IRB width have a different effect on the ORB spectral irradiance. We utilized our model to quantify the effect of spectrometer slit width and IRB width on the spectral irradiance of the ORB image at the CCD.…”

Section: Discussioncontrasting

confidence: 99%

“…It is well known that the observed Raman line shape results form a convolution between the IRB and the spectrometer slit function. [1,2,14] Many papers have examined the dependence of this convolution on the bandwidth and band shape of the ORB; however, only a few papers have investigated its effect on intensity. [10][11][12][13][14][15][16][17][18] Most notably, papers by Bernstein and Alle [12] and Arora and Umadevi [10] show that the ORB intensity is strongly dependent on the ratio of the slit function and Raman bandwidths.…”

Section: Dependence Of Raman Band Area and Intensity On Slit Widthmentioning

confidence: 99%

“…[1,2,14] Many papers have examined the dependence of this convolution on the bandwidth and band shape of the ORB; however, only a few papers have investigated its effect on intensity. [10][11][12][13][14][15][16][17][18] Most notably, papers by Bernstein and Alle [12] and Arora and Umadevi [10] show that the ORB intensity is strongly dependent on the ratio of the slit function and Raman bandwidths. In both papers, they model the ORB as a convolution between the IRB and the slit function.…”

Section: Dependence Of Raman Band Area and Intensity On Slit Widthmentioning

confidence: 99%

“…[7][8][9] Many papers claim a significant dependence of slit width on intensity and area. [10][11][12][13][14][15][16][17][18] However, none of these papers adequately describe or quantify the mechanism of the slit width-intensity dependence. Many of these papers utilize single-channel scanning spectrometers with entrance and exit slits.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the spectrometer slit width and charge‐coupled device detector on Raman intensities

Jakubek

2021

J Raman Spectroscopy

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It is well known that Raman intensities are affected by the spectrometer slit width. Wider slit widths provide increased Raman intensity at the cost of decreased spectral wavenumber resolution. However, the relationship between the spectrometer slit width and observed Raman intensities is poorly understood. In this work, we develop a model, based on spectrometer geometric optics, to quantify the effects of spectrometer slit width on observed Raman intensities. We find that the observed Raman intensities are strongly dependent on the ratio of the slit function width and intrinsic Raman band width.Thus, even for Raman spectra collected using the same slit width, the observed Raman intensities will be affected by the different intrinsic bandwidths of each Raman band. Thus, the effects of the slit function on Raman intensities must be considered for all Raman spectra when examining Raman intensities. In addition, we show that the spectrometer linear dispersion and charge-coupled device (CCD) pixel size have a large dependence on the Raman intensities reported by the CCD. Thus, when comparing Raman intensities across instruments or for a single instrument with a nonlinear wavenumber calibration, Raman intensities must be calibrated for the effects of the CCD. Using our model, we develop a general method for correcting observed Raman intensities for the effects of the slit width, intrinsic Raman band width, and CCD.

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Section: Discussioncontrasting

confidence: 99%

Section: Dependence Of Raman Band Area and Intensity On Slit Widthmentioning

confidence: 99%

Section: Dependence Of Raman Band Area and Intensity On Slit Widthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of the spectrometer slit width and charge‐coupled device detector on Raman intensities

Jakubek

2021

J Raman Spectroscopy

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“…Gordon's theory relating a molecular reorientation correlation function to the shape of the depolarized components of Raman bands has been extended, and situations where the contributions from reorientation and vibrational relaxation to the line shape can be separated have been discussed (105). The correction of experimental line shapes for non-ideal slit functions has been described (106). The purpose of the corrections is to permit the determination of the true line width at medium resolution, where the line width may only be two to three times the width of the slit function, and where the slit function may not be symmetrical in shape.…”

Section: Instrumentation and Sampling Techniquementioning

confidence: 99%

Raman spectrometry

Grossman¹

1974

Anal. Chem.

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This Review covers selected portions of the literature appearing between late 1971 and late 1973. Activity in the field has continued at a high level since the previous review in this series (1), and it seems neither possible nor desirable to give a comprehensive coverage of the published literature. The emphasis here will be on the chemical applications of Raman spectrometry, especially in the areas of analysis and instrumentation, as being most like-ly to be of interest to the readers of this journal. Where possible, reviews and other secondary sources which give more detailed coverage of smaller areas will be referenced.Several new books have appeared during the time covered by the review (2-7), evidence of the need for consolidation and ordering in a rapidly growing field. A critical compilation of vibrational frequencies of 55 polyatomic molecules has been published (8). Inorganic vibrational

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Raman intensities of the uncoupled OD oscillators in liquid water

Mundy

Gutiérrez

Spedding

1973

The Journal of Chemical Physics

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Raman data were obtained for both polarizations of the OD stretching vibration of HDO in solutions containing different amounts of D2O(1–10 mole%) in H2O in order to assess the extent to which interand intramolecular couplings might perturb the OD stretching vibrations of HDO. The results were extrapolated to infinite dilution and the extrapolations are presented as the relative molar intensities for the uncoupled OD vibrations in liquid water. As the amount of D2O in each solution was increased noticeable, regular shifts in the frequency of the peak intensities and the bandwidths of the OD spectral band were observed. Although these shifts are small, apparently the presence of D2O and the effects due to coupled OD oscillators still make measurable perturbations to the OD vibrations for solutions containing as little as 1 mole% D2O. Consistent depolarization ratios were also obtained which clearly demonstrate that the value of this ratio is not constant across the OD stretching region. In addition functional fits to the spectral band data were made and their results are presented.

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Slit-Function Corrections Applied to Laser-Excited Raman Bands of Liquids

Cited by 3 publications

References 5 publications

Effect of the spectrometer slit width and charge‐coupled device detector on Raman intensities

Effect of the spectrometer slit width and charge‐coupled device detector on Raman intensities

Raman spectrometry

Raman intensities of the uncoupled OD oscillators in liquid water

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