Numerical error analysis of derivative spectrometry for the quantitative analysis of mixtures

O’Haver, T. C.; Green, G. L.

doi:10.1021/ac60366a016

Cited by 352 publications

(87 citation statements)

References 4 publications

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“…For example, this implementation is commonly used in signal processing of spectroscopic data and referred to as derivative spectrophotometry. 44 Fig . 6 presents the numerical 2nd derivatives of the imaginary part of the dielectric function for various samples.…”

Section: Discussionmentioning

confidence: 99%

Synthesis of Ge1−xSnx alloys by ion implantation and pulsed laser melting: Towards a group IV direct bandgap material

Tran

Pastor

Gandhi

et al. 2016

Journal of Applied Physics

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The germanium-tin (Ge1−xSnx) material system is expected to be a direct bandgap group IV semiconductor at a Sn content of 6.5−11 at. %. Such Sn concentrations can be realized by non-equilibrium deposition techniques such as molecular beam epitaxy or chemical vapour deposition. In this report, the combination of ion implantation and pulsed laser melting is demonstrated to be an alternative promising method to produce a highly Sn concentrated alloy with a good crystal quality. The structural properties of the alloys such as soluble Sn concentration, strain distribution, and crystal quality have been characterized by Rutherford backscattering spectrometry, Raman spectroscopy, x ray diffraction, and transmission electron microscopy. It is shown that it is possible to produce a high quality alloy with up to 6.2 at. %Sn. The optical properties and electronic band structure have been studied by spectroscopic ellipsometry. The introduction of substitutional Sn into Ge is shown to either induce a splitting between light and heavy hole subbands or lower the conduction band at the Γ valley. Limitations and possible solutions to introducing higher Sn content into Ge that is sufficient for a direct bandgap transition are also discussed.

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Section: Discussionmentioning

confidence: 99%

Synthesis of Ge1−xSnx alloys by ion implantation and pulsed laser melting: Towards a group IV direct bandgap material

Tran

Pastor

Gandhi

et al. 2016

Journal of Applied Physics

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“…It can be seen that, because of the closeness of the two overlapping spectra of the zinc and cadmium complexes, these spectra are not suf®ciently resolved to give two distinct peaks. For this reason, the zerocrossing method [26] was used to resolve the mixture. The heights h 1 and h 2 in the second-derivative spectrum of the mixture (Fig.…”

Section: Absorption Spectramentioning

confidence: 99%

Experimental Designs Applied to Solid-Phase Derivative Spectrophotometry

2000

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Abstract. Using two statistical models, based on the two-level full factorial designs and sequential experimental Doehlert designs, a simultaneous determination of cadmium and zinc by solid-phase derivative spectrophotometry has been proposed. These chemometric techniques have been used for the optimization of the instrumental and experimental variables of the system. The complexes formed between cadmium and zinc with 4-(2-pyridylazo) resorcinol, in the presence of potassium iodide, were ®xed on a dextran-type anionexchange gel, at pH 8.7. The absorbance spectra of the gel, packed in a 1-mm cell, were recorded directly. The performance characteristics of the proposed method have been established. The method was applied to the simultaneous determination of both analytes in synthetic mixtures and natural water samples.

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“…Several spectrophotometric methods, such as derivative spectrophotometry, [1][2][3][4][5] ratio spectra derivative method, 6 ratio spectra derivative-zero crossing method, 7-9 DDRS-DS method [10][11][12][13][14] and double divisor-ratio spectra derivative-zero crossing method 15 have been reported in the literature and applied for ternary and quaternary mixtures. However, it was observed that the derivative spectrophotometry and ratio spectra derivative method provide a good analytical resolution of binary mixtures but these two methods do not give always desirable results for the analysis of ternary and quaternary mixtures.…”

Section: Introductionmentioning

confidence: 99%

Application of Haar and Mexican hat wavelets to double divisor-ratio spectra for the multicomponent determination of ascorbic acid, acetylsalicylic acid and paracetamol in effervescent tablets

Dinç¹,

Băleanu²

2008

J. Braz. Chem. Soc.

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A determinação simultânea de ácido ascórbico (AA), ácido acetilsalicílico (ASP) e paracetamol (PAR) em misturas sintéticas e tabletes efervescentes foi realizada usando-se as técnicas de transformações de Haar e transformações de onda pequena tipo chapéu mexicano (HAAR-CWT e MEXH-CWT, respectivamente), juntamente com a técnica de divisor duplo. Os métodos de processamento de sinal são baseados na aplicação de HAAR-CWT e MEXH-CWT aos espectros relativos com divisor duplo (DDRS). Estes espectros foram obtidos pela divisão do espectro de absorção do composto puro e suas misturas ternárias, por um divisor duplo ou espectro padrão correspondente à mistura de dois compostos em mistura ternária. O uso combinado de HAAR-CWT e MEXH-CWT com espectros relativos com divisor duplo (DDRS) foi denominado DDRS-HAAR CWT e DDRS-MEXH CWT. Para avaliar a habilidade ou aplicabilidade dos métodos desenvolvidos DDRS-CWT, foi aplicado como comparação, o método espectrofotométrico por derivada de espectros relativos com divisor duplo (DDRS-DS), às amostras mencionadas acima, contendo AA, ASP e PAR. Resultados satisfatórios foram obtidos.Simultaneous determination of ascorbic acid (AA), acetylsalicylic acid (ASP) and paracetamol (PAR) in their synthetic mixtures and effervescent tablets were performed by Haar and Mexican continuous wavelet transforms (HAAR-CWT and MEXH-CWT, respectively) together with double divisor technique. The signal processing methods are based on the application of HAAR-CWT and MEXH-CWT to the double divisor-ratio spectra (DDRS). These spectra were obtained by dividing the absorption spectra of pure compound and its ternary mixtures by a double-divisor or standard spectrum corresponding to a mixture of two compounds in ternary mixture. A combined use of HAAR-CWT and MEXH-CWT with double divisor-ratio spectra (DDRS) was denoted by DDRS-HAAR CWT and DDRS-MEXH CWT. To check the ability or applicability of the developed DDRS-CWT methods, the double divisor-ratio spectra-derivative spectrophotometric (DDRS-DS) method, as a comparison method, was applied to the above mentioned samples containing AA, ASP and PAR and satisfactory results were obtained.

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Numerical error analysis of derivative spectrometry for the quantitative analysis of mixtures

Cited by 352 publications

References 4 publications

Synthesis of Ge1−xSnx alloys by ion implantation and pulsed laser melting: Towards a group IV direct bandgap material

Synthesis of Ge1−xSnx alloys by ion implantation and pulsed laser melting: Towards a group IV direct bandgap material

Experimental Designs Applied to Solid-Phase Derivative Spectrophotometry

Application of Haar and Mexican hat wavelets to double divisor-ratio spectra for the multicomponent determination of ascorbic acid, acetylsalicylic acid and paracetamol in effervescent tablets

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