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dc.contributor.authorDobryakov, A.L.
dc.contributor.authorKovalenko, Sergey A.
dc.contributor.authorWeigel, A.
dc.contributor.authorPérez Lustres, José Luis
dc.contributor.authorLange, J.
dc.contributor.authorMüller, A.
dc.contributor.authorErnsting, N.P.
dc.identifier.citationDobryakov, A., Kovalenko, S., Weigel, A., Pérez-Lustres, J., Lange, J., Müller, A., & Ernsting, N. (2010). Femtosecond pump/supercontinuum-probe spectroscopy: Optimized setup and signal analysis for single-shot spectral referencing. Review Of Scientific Instruments, 81(11), 113106. doi: 10.1063/1.3492897
dc.description.abstractA setup for pump/supercontinuum-probe spectroscopy is described which (i) is optimized to cancel fluctuations of the probe light by single-shot referencing, and (ii) extends the probe range into the near-uv (1000–270 nm). Reflective optics allow 50 μm spot size in the sample and upon entry into two separate spectrographs. The correlation γsame between sample and reference readings of probe light level at every pixel exceeds 0.99, compared to γconsec<0.92 reported for consecutive referencing. Statistical analysis provides the confidence interval of the induced optical density, ΔOD. For demonstration we first examine a dye (Hoechst 33258) bound in the minor groove of double-stranded DNA. A weak 1.1 ps spectral oscillation in the fluorescence region, assigned to DNA breathing, is shown to be significant. A second example concerns the weak vibrational structure around t=0 which reflects stimulated Raman processes. With 1% fluctuations of probe power, baseline noise for a transient absorption spectrum becomes 25 μOD rms in 1 s at 1 kHz, allowing to record resonance Raman spectra of flavine adenine dinucleotide in the S0 and S1 state
dc.description.sponsorshipWe are grateful to the Deutsche Forschungsgemeinschaft for support (SFB 450 and Cluster of Excellence “Unifying Concepts in Catalysis”)
dc.publisherAIP Publishing
dc.rights© 2010 American Institute of Physics
dc.subjectRaman spectra
dc.subjectVisible spectra
dc.subjectDiffraction gratings
dc.subjectOptical pulse generation
dc.subjectTransient optical absorption
dc.subjectVisible spectrometers
dc.subjectAbsorption spectra
dc.subjectFluorescence spectra
dc.titleFemtosecond pump/supercontinuum-probe spectroscopy: Optimized setup and signal analysis for single-shot spectral referencing
dc.contributor.affiliationUniversidade de Santiago de Compostela. Departamento de Química Física

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