A broadband, femtosecond transient circular dichroism (TRCD) spectrometer has been developed and tested in the wavelength range from 350 to 700 nm. The spectrometer uses a femtosecond probe white light with well-defined circular polarization. The latter is modulated by the polarization of a narrowband seed pulse. We have implemented a dual-beam probe geometry with phase-locked detection technique to increase the signal-to-noise ratio and to reduce optical artifacts. The spectrometer allows the acquisition of TRCD spectra with subpicosecond time resolution and typical noise levels of absorbance units. The performance of this instrument has been demonstrated on bis(merocyanine) nanorod aggregates in tetrahydrofurane/methylcyclohexane solution. The case study confirmed that this spectrometer is effective for the investigation of chiral properties in various molecular and nanostructural systems that have transient spectra in the UV-visible spectral range.
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April 2010
Research Article|
April 15 2010
Broadband femtosecond circular dichroism spectrometer with white-light polarization control
Anton Trifonov;
Anton Trifonov
1Eugene F. Merkert Chemistry Center,
Boston College
, 2609 Beacon St., Chestnut Hill, Massachusetts 02467, USA
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Ivan Buchvarov;
Ivan Buchvarov
2Department of Physics,
Sofia University
, 5 James Bourchier Blvd., Sofia 1164, Bulgaria
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Andreas Lohr;
Andreas Lohr
3Institute of Organic Chemistry,
Am Hubland
, D-97074 Würzburg, Germany
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Frank Würthner;
Frank Würthner
3Institute of Organic Chemistry,
Am Hubland
, D-97074 Würzburg, Germany
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Torsten Fiebig
Torsten Fiebig
1Eugene F. Merkert Chemistry Center,
Boston College
, 2609 Beacon St., Chestnut Hill, Massachusetts 02467, USA
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Anton Trifonov
1
Ivan Buchvarov
2
Andreas Lohr
3
Frank Würthner
3
Torsten Fiebig
1
1Eugene F. Merkert Chemistry Center,
Boston College
, 2609 Beacon St., Chestnut Hill, Massachusetts 02467, USA
2Department of Physics,
Sofia University
, 5 James Bourchier Blvd., Sofia 1164, Bulgaria
3Institute of Organic Chemistry,
Am Hubland
, D-97074 Würzburg, Germany
Rev. Sci. Instrum. 81, 043104 (2010)
Article history
Received:
October 21 2009
Accepted:
February 06 2010
Citation
Anton Trifonov, Ivan Buchvarov, Andreas Lohr, Frank Würthner, Torsten Fiebig; Broadband femtosecond circular dichroism spectrometer with white-light polarization control. Rev. Sci. Instrum. 1 April 2010; 81 (4): 043104. https://doi.org/10.1063/1.3340892
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