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. 2016 Nov 23;16(12):7467–7473. doi: 10.1021/acs.nanolett.6b03143

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Copyright © 2016 American Chemical Society

This is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes.

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Analysis of absorption and CD spectra. Top (a–c): Absorption spectra of (a) CdSe sample S1, (b) CdSe sample S2, and (c) CdS QDs. The measured spectra appear in cyan. The Gaussians that reconstruct the spectra in dashed colored lines, where the green dots mark their maxima. These peaks can be assigned to the different excitonic transitions²² (from low to high energy): 1S_3/21S_e, 2S_3/21S_e, 1S_1/21S_e, 1P_3/21P_e, 2S_1/21S_e, 1P_5/21P_e or 1P^l_1/21P_e (light hole subband), and 3S_1/21S_e. The dashed pink lines mark the reconstructed absorption spectra. Bottom (a–c): Reconstructed CD spectra for the same samples as in the top images, using the derivatives of the Gaussians at the same center wavelengths. The blue line marks again the measured absorption spectrum. The cyan lines mark the measured CD and the dashed pink lines the CD spectrum that was reconstructed using the sum of derivatives. (d) A scheme depicting the relevant quantities to determine energy splitting (ΔE_i) from the CD and absorption measurements. The energy splitting is proportional to .

Inline graphic — Analysis of absorption and CD spectra. Top (a–c): Absorption spectra of (a) CdSe sample S1, (b) CdSe sample S2, and (c) CdS QDs. The measured spectra appear in cyan. The Gaussians that reconstruct the spectra in dashed colored lines, where the green dots mark their maxima. These peaks can be assigned to the different excitonic transitions²² (from low to high energy): 1S_3/21S_e, 2S_3/21S_e, 1S_1/21S_e, 1P_3/21P_e, 2S_1/21S_e, 1P_5/21P_e or 1P^l_1/21P_e (light hole subband), and 3S_1/21S_e. The dashed pink lines mark the reconstructed absorption spectra. Bottom (a–c): Reconstructed CD spectra for the same samples as in the top images, using the derivatives of the Gaussians at the same center wavelengths. The blue line marks again the measured absorption spectrum. The cyan lines mark the measured CD and the dashed pink lines the CD spectrum that was reconstructed using the sum of derivatives. (d) A scheme depicting the relevant quantities to determine energy splitting (ΔE_i) from the CD and absorption measurements. The energy splitting is proportional to .