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Portrait of Tönu Pullerits; Photo: Kennet Ruona

Tönu Pullerits

Professor

Portrait of Tönu Pullerits; Photo: Kennet Ruona

Compressed Sensing for Reconstructing Coherent Multidimensional Spectra

Author

  • Zhengjun Wang
  • Shiwen Lei
  • Khadga Jung Karki
  • Andreas Jakobsson
  • Tönu Pullerits

Summary, in English

We apply two sparse reconstruction techniques, the least absolute shrinkage and selection operator (LASSO) and the sparse exponential mode analysis (SEMA), to two-dimensional (2D) spectroscopy. The algorithms are first tested on model data, showing that both are able to reconstruct the spectra using only a fraction of the data required by the traditional Fourier-based estimator. Through the analysis of the sparsely sampled experimental fluorescence-detected 2D spectra of LH2 complexes, we conclude that both SEMA and LASSO can be used to significantly reduce the required data, still allowing one to reconstruct the multidimensional spectra. Of the two techniques, it is shown that SEMA offers preferable performance, providing more accurate estimation of the spectral line widths and their positions. Furthermore, SEMA allows for off-grid components, enabling the use of a much smaller dictionary than that of the LASSO, thereby improving both the performance and the lowering of the computational complexity for reconstructing coherent multidimensional spectra.

Department/s

  • Chemical Physics
  • NanoLund: Center for Nanoscience
  • eSSENCE: The e-Science Collaboration
  • Statistical Signal Processing Group
  • Mathematical Statistics

Publishing year

2020

Language

English

Pages

1861-1866

Publication/Series

Journal of Physical Chemistry A

Volume

124

Issue

9

Document type

Journal article

Publisher

The American Chemical Society (ACS)

Topic

  • Electrical Engineering, Electronic Engineering, Information Engineering
  • Condensed Matter Physics

Status

Published

Research group

  • Statistical Signal Processing Group

ISBN/ISSN/Other

  • ISSN: 1089-5639