Provider: ingentaconnect
Database: ingentaconnect
Content: application/x-research-info-systems
TY - ABST
AU - Saarinen, Pekka E.
AU - Kauppinen, Jyrki K.
AU - Partanen, Jari O.
TI - New Method for Spectral Line Shape Fitting and Critique on the Voigt Line Shape Model
JO - Applied Spectroscopy
PY - 1995-10-01T00:00:00///
VL - 49
IS - 10
SP - 1438
EP - 1453
KW - Spectral lines
KW - Voigt line shape model
KW - Linear prediction
KW - Line shape
KW - Resolution enhancement
N2 - In this work we introduce a new method for testing spectral line shape models and optimizing the parameters in any parametric model. Given some general parametric line shape and a piece of a spectrum, the method finds the optimal values for the parameters and gives a number which tells
how well the spectrum under consideration is explained by that model. The number of spectral lines under analysis may be more than one, and their exact locations need not be known. This characteristic follows from the property that the method does not need the information about line positions
and amplitudes at all. Thus, in the absence of a singlet line, a set of overlapping lines can also be analyzed. The analysis is carried out in the signal domain by utilizing linear prediction. Application examples of the method to a molecular spectrum measured in gas phase are given. The results
suggest that the Voigt line shape, despite its common use, is not a correct model in molecular spectroscopy. Its limitations become evident when one is trying to enhance the resolution by linear prediction, which requires detailed knowledge of the line shape. Instead a stochastic model, which
is also tested, turns out to be rather promising.
UR - http://www.ingentaconnect.com/content/sas/sas/1995/00000049/00000010/art00007
M3 - doi:10.1366/0003702953965506
UR - http://dx.doi.org/10.1366/0003702953965506
ER -