Use of Curve Analysis to Analyze Overlapping Bands in the Infrared Spectra of Polymers

Fourier Self-Deconvolved Infrared Spectra as an Aid to Conformational Studies on Poly(Vinyl Chloride)

Applied Spectroscopy ◽

10.1366/0003702864509583 ◽

1986 ◽

Vol 40 (2) ◽

pp. 239-245 ◽

Cited By ~ 14

Author(s):

David A. C. Compton ◽

William F. Maddams

Keyword(s):

Vinyl Chloride ◽

Infrared Spectra ◽

Curve Fitting ◽

Conformational Structure ◽

Conformational Studies ◽

Peak Finding ◽

Poly Vinyl Chloride ◽

Three Samples ◽

Polymer Tacticity ◽

Overlapping Bands

Fourier self-deconvolution has been used to enhance the detail present in the carbon-chlorine stretching region of the infrared spectra of three samples of polyvinyl chloride) covering a range of syndiotacticities. The results are of interest both as a good example of the scope and limitations of Fourier self-deconvolution and because they complement the information on the conformational structure of these polymers obtained previously by other peak-finding methods. In the former context, the results show that the use of varying degrees of over-deconvolution is advantageous in dealing with systems of overlapping bands having a range of half widths. With respect to the conformational structure of poly(vinyl chloride), the most significant conclusion is that the frequency of the B1 mode of long syndiotactic sequences is dependent on both polymer tacticity and the form in which the sample is examined. The implications of this finding for the use of curve fitting are discussed briefly.

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Fourier transform-based deconvolution techniques for resolution of overlapping bands in x-ray photoelectron and fourier-transform infrared spectra of bisphenol-a-polycarbonate/dimethyl siloxane block copolymers

Analytica Chimica Acta ◽

10.1016/s0003-2670(00)86311-4 ◽

1986 ◽

Vol 191 ◽

pp. 227-241 ◽

Cited By ~ 9

Author(s):

Eric R. Mittlefehldt ◽

Joseph A. Gardella ◽

Lawrence Salvati

Keyword(s):

Fourier Transform ◽

Block Copolymers ◽

Bisphenol A ◽

Infrared Spectra ◽

Fourier Transform Infrared ◽

Bisphenol A Polycarbonate ◽

X Ray ◽

Dimethyl Siloxane ◽

Deconvolution Techniques ◽

Overlapping Bands

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Vibrational Spectra and Normal Coordinate Analysis of Disulfuryl Difluoride S2O5F2 and Diselenonyl Difluoride Se2O5F2

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19930517 ◽

1993 ◽

Vol 58 (3) ◽

pp. 517-529 ◽

Cited By ~ 3

Author(s):

Jiří Toužín ◽

Miloš Černík

Keyword(s):

Raman Spectrum ◽

Force Field ◽

Raman Spectra ◽

Infrared Spectra ◽

Vibrational Spectra ◽

Room Temperature ◽

Normal Coordinate Analysis ◽

Normal Coordinate ◽

Valence Force Field ◽

Overlapping Bands

Raman spectra (1 600 - 100 cm-1) of liquid S2O5F2 and Se2O5F2 and infrared spectra of liquid and gaseous S2O5F2 were measured. A modified general valence force field was used for their interpretation by normal coordinate analysis. Refinement of the number of lines in the Raman spectrum of S2O5F2 by means of numerical separation of the overlapping bands led to the conclusion that liquid S2O5F2 consists at least of three rotamers at room temperature.

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Which Data to Meta-Analyze, and How?

Zeitschrift für Psychologie ◽

10.1027/2151-2604/a000357 ◽

2019 ◽

Vol 227 (1) ◽

pp. 64-82 ◽

Cited By ~ 3

Author(s):

Martin Voracek ◽

Michael Kossmeier ◽

Ulrich S. Tran

Keyword(s):

Empirical Research ◽

Meta Analysis ◽

Curve Analysis ◽

Research Progress ◽

Primary Data ◽

Statistical Procedures ◽

Graphical Displays ◽

Primary Data Analysis ◽

Meta Analyses ◽

Data Analytic

Abstract. Which data to analyze, and how, are fundamental questions of all empirical research. As there are always numerous flexibilities in data-analytic decisions (a “garden of forking paths”), this poses perennial problems to all empirical research. Specification-curve analysis and multiverse analysis have recently been proposed as solutions to these issues. Building on the structural analogies between primary data analysis and meta-analysis, we transform and adapt these approaches to the meta-analytic level, in tandem with combinatorial meta-analysis. We explain the rationale of this idea, suggest descriptive and inferential statistical procedures, as well as graphical displays, provide code for meta-analytic practitioners to generate and use these, and present a fully worked real example from digit ratio (2D:4D) research, totaling 1,592 meta-analytic specifications. Specification-curve and multiverse meta-analysis holds promise to resolve conflicting meta-analyses, contested evidence, controversial empirical literatures, and polarized research, and to mitigate the associated detrimental effects of these phenomena on research progress.

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