Table 1 Degradation rate ( \(\:\varvec{\beta\:}\) ), half-lives ( \(\:{\varvec{t}}_{1/2}\:\)), destruction cross section ( \(\:\varvec{\upsigma\:}\) ) and degradation percentage for pure 2, 6-dhn, along with vibrational mode assignment (See Fig. 3 caption for the legend). Half-life values are evaluated both relative to the annual mean UV flux at Jezero crater (estimated using the COMIMART model80 which includes state-of-the-art dust radiative properties81,82 and corrected by Mastcam-Z opacities37,83) and relative to the theoretical Martian UV flux estimated by patel et al. 12 (assuming dust free atmosphere at the noontime equator4). The last row weighting procedure is showed in supplementary table S3.
Band [\(\:{\varvec{c}\varvec{m}}^{-1}\)] | 2,6-dihydroxynaphthalene vibrational mode | \(\:\varvec{\beta\,}\left[{{10}^{-4}\varvec{s}}^{-1}\right]\) | \(\:{\varvec{t}}_{1/2}\:\left[\varvec{s}\varvec{o}\varvec{l}\right]\) Jezero crater flux | \(\:{\varvec{t}}_{1/2}\:\left[\varvec{s}\varvec{o}\varvec{l}\right]\) Patel et al., 2002 flux | \(\:\varvec{\sigma\,}//\left[{10}^{-21}{\varvec{c}\varvec{m}}^{2}\right]\) | Degradation percentage DP [%] |
|---|---|---|---|---|---|---|
4326 | Combination δipCH and δipOH + 𝜈CH * | \(\:6\pm\:3\) | 8 ± 3 | \(\:5\pm\:2\) | \(\:2.4\pm\:1.0\) | \(\:1.2\pm\:0.2\) |
2899 | Combination δipCH and δipOH and 𝜈CC + δipCH and 𝜈CC and δOH * | \(\:1.5\pm\:1.2\) | 36 ± 26 | \(\:21\pm\:17\) | \(\:0.5\pm\:0.4\) | \(\:2.3\pm\:1.3\) |
2874 | Fundamental 𝜈CH */** | \(\:2.2\pm\:0.5\) | 24 ± 6 | \(\:14\pm\:3\) | \(\:0.8\pm\:0.2\) | \(\:1.0\pm\:0.1\) |
2706 | Combination δipCH and δipOH + δipCH and 𝜈CC (adjacent to OH) and δipOH * | \(\:1.3\pm\:0.4\) | 40 ± 11 | \(\:23\pm\:7\) | \(\:0.5\pm\:0.1\) | \(\:1.5\pm\:0.3\) |
2687 | Combination 𝜈C-OH and ring breathing and δCH + δipCH and δipOH and 𝜈CC * | \(\:2.0\pm\:1.0\) | 27 ± 14 | \(\:16\pm\:8\) | \(\:0.7\pm\:0.4\) | \(\:2.0\pm\:0.5\) |
2548 | Combination δipCH and δipOH + 𝜈C-OH and ring breathing and δCH * | \(\:1.5\pm\:0.3\) | 36 ± 7 | \(\:21\pm\:4\) | \(\:0.5\pm\:0.1\) | \(\:0.8\pm\:0.1\) |
2448 | Combination δipCH and δipOH + δipCH and δipOH * | \(\:3.2\pm\:0.7\) | 18 ± 5 | \(\:10\pm\:2\) | \(\:1.1\pm\:0.3\) | \(\:1.3\pm\:0.1\) |
2133 | Combination δoopCH + δipCH and δipOH * | \(\:1.9\pm\:0.9\) | 28 ± 13 | \(\:16\pm\:8\) | \(\:0.7\pm\:0.3\) | \(\:2.8\pm\:0.7\) |
2122 | Combination δipCH and δipC-OH + 𝜈CC and δipOH and δipCH * | \(\:1.9\pm\:0.8\) | 29 ± 13 | \(\:17\pm\:8\) | \(\:0.7\pm\:0.3\) | \(\:0.4\pm\:0.1\) |
2089 | Combination δipCH and 𝜈CC and δOH + ring deformation * | \(\:3.2\pm\:0.9\) | 17 ± 5 | \(\:10\pm\:3\) | \(\:1.1\pm\:0.3\) | \(\:0.4\pm\:0.1\) |
2071 | Combination δipCH and 𝜈CC and δipOH + ring deformation * | \(\:4.2\pm\:1.4\) | 13 ± 5 | \(\:7\pm\:3\) | \(\:1.5\pm\:0.5\) | \(\:1.4\pm\:0.2\) |
2006 | Combination δoopCH + δipCH * | \(\:3.6\pm\:1.3\) | 15 ± 5 | \(\:8\pm\:3\) | \(\:1.3\pm\:0.5\) | \(\:2.6\pm\:0.3\) |
1312 | Fundamental δipOH */** | \(\:11\pm\:2\) | 5 ± 1 | \(\:2.9\pm\:0.6\) | \(\:3.9\pm\:0.9\) | \(\:0.55\pm\:0.04\) |
1281 | Fundamental δipCH */** | \(\:2.7\pm\:0.6\) | 20 ± 4 | \(\:11\pm\:3\) | \(\:1.0\pm\:0.2\) | \(\:0.8\pm\:0.1\) |
1236 | Fundamental δipCH */** | \(\:5.7\pm\:1.4\) | 9 ± 2 | \(\:5.4\pm\:1.4\) | \(\:2.1\pm\:0.5\) | \(\:0.51\pm\:0.04\) |
1215 | Fundamental δipOH * | \(\:4.4\pm\:0.7\) | 12 ± 2 | \(\:7.0\pm\:1.1\) | \(\:1.6\pm\:0.3\) | \(\:1.2\pm\:0.1\) |
1150 | Fundamental δipCH and δipOH * | \(\:3.3\pm\:0.8\) | 16 ± 4 | \(\:9\pm\:2\) | \(\:1.2\pm\:0.3\) | \(\:0.31\pm\:0.03\) |
1065 | Combination δoopCH + δoopCH * | \(\:3.4\pm\:0.9\) | 16 ± 4 | \(\:9\pm\:2\) | \(\:1.2\pm\:0.3\) | \(\:30\pm\:3\) |
1040 | Combination δoopOH + δoopCH * | \(\:6\pm\:3\) | 10 ± 5 | \(\:6\pm\:3\) | \(\:2.0\pm\:1.0\) | \(\:2.2\pm\:0.4\) |
Weighted average values | \(\:2.3\pm\:0.2\) | \(\:10\pm\:1\) | \(\:5.7\pm\:0.4\) | \(\:0.8\pm\:0.1\) | \(\:0.55\pm\:0.02\) | |
