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Electronic parameter determination for potassium chromate by coherent anti‐stokes Raman spectroscopy
Author(s) -
Bostick J. M.,
Carreira L. A.,
Antcliff R. R.
Publication year - 1990
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250210912
Subject(s) - raman spectroscopy , chemistry , spectral line , analytical chemistry (journal) , spectroscopy , jacobian matrix and determinant , yield (engineering) , wavelength , resonance (particle physics) , coherent anti stokes raman spectroscopy , absorption spectroscopy , molecular electronic transition , computational physics , atomic physics , mathematics , physics , optics , raman scattering , quantum mechanics , thermodynamics , chromatography
Two separate methods of spectral analysis have been used to analyze the CARS spectra of K 2 CrO 4 at pump wavelengths near its electronic transition. The Jacobian least‐squares line‐fitting method requires initial guesses for parameters and returns directly the best iteratively fitted parameters. These were then used to plot the relative magnitudes of the Lorentzian and dispersive components, i.e. imaginary and real terms, respectively, of these bands. The FREIGHT–CARS method of spectral phase extraction was used to yield directly the relative values of the Lorentzian and dispersive components. A comparison of the values obtained by both methods shows a fundamental agreement between the relative magnitudes of these parameters. In both analyses, the Lorentzian contribution to the resonance region is seen to approach a maximum near the electronic absorption.