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. 2023 Nov 6;25(11):1520. doi: 10.3390/e25111520

Figure 2.

Figure 2

Gradient temperature Raman spectroscopy data for DHA and DPAn-3. Colors range from white (highest signal intensity) to red, orange, yellow, green, blue, to dark blue (lowest signal intensity. The red and green represent δ-positive and δ-negatives. There is a striking contrast between DHA and DPAn-3, especially in the high-frequency vibrational modes (2100-1500). These data suggest a high probability that DHA will accept vibronic information, with the energy being absorbed by an outer orbital electron. In this wavenumber region, the only common feature between DHA and DPAn-3 is white, which refers to the C=O. Adapted from [39].