Open Access
Table B.3
Molecular abundances in diffuse and translucent clouds.
| Molecule | Abundance | Range (dex) | Reference |
|---|---|---|---|
| OH | 1.0 × 10−7 | 0.1 | Weselak et al. (2010) |
| o-H2O | 2.7 × 10−8 | 0.2 | Gerin et al. (2019) |
| OH+ | 1.0 × 10−8 | 0.5 | Jacob et al. (2022) |
| H2O+ | 1.0 × 10−9 | 0.3 | Jacob et al. (2022) |
| H3O+ | 1.0 × 10−9 | 0.3 | Lis et al. (2014) |
| CO | 2.0 × 10−6 | 1 | Liszt & Gerin (2023) |
| HCO | 1.0 × 10−9 | 0.21 | Liszt & Gerin (2025); Liszt et al. (2014) |
| HCO+ | 3.0 × 10−9 | 0.21 | Gerin et al. (2019) |
| HOC+ | 4.6 × 10−11 | 0.21 | Gerin et al. (2019) |
| H2CO | 5.0 × 10−9 | 0.21 | Gerin et al. (2024) |
| H2CCO | 3.0 × 10−10 | This work | |
| CH3CHO | 3.1 × 10−10 | This work | |
| CH | 3.6 × 10−8 | 0.21 | Sheffer et al. (2008) |
| CH+ | 5.0 × 10−8 | 0.5 | Godard et al. (2012) |
| CH2 | 1.3 × 10−8 | 0.3 | Polehampton et al. (2005) |
| CH3 | 2.0 × 10−8 | 0.3 | Feuchtgruber et al. (2000) |
| C2 | 5.0 × 10−8 | 0.3 | Fan et al. (2024) |
| C2H | 4.4 × 10−8 | 0.15 | Gerin et al. (2019) |
| C2H2 | 1.5 × 10−8 | 0.3 | Feuchtgruber et al. (2000) |
| C3 | 3.5 × 10−9 | 0.3 | Fan et al. (2024) |
| 1-C3H | 2.1 × 10−10 | 0.3 | Liszt et al. (2018) |
| c-C3H | 1.4 × 10−10 | 0.3 | Liszt et al. (2014) |
| C3H+ | 5.0 × 10−11 | 0.3 | Gerin et al. (2019), This work |
| c-C3H2 | 2.5 × 10−9 | 0.3 | Liszt et al. (2018) |
| 1-C3H2 | 1.0 × 10−10 | 0.3 | Liszt et al. (2018) |
| C4H | 6.2 × 10−10 | This work | |
| C60 | 8.5 × 10−10 | 0.4 | Cordiner et al. (2019); Berné et al. (2013) |
| C60+ | 5.0 × 10−10 | 0.4 | Cordiner et al. (2019); Berné et al. (2013) |
| NH | 8.0 × 10−9 | 0.2 | Persson et al. (2012) |
| o-NH2 | 4.0 × 10−9 | 0.2 | Persson et al. (2012, 2016) |
| o-NH3 | 2.0 × 10−9 | 0.2 | Persson et al. (2012, 2016) |
| N2 | 3.0 × 10−7 | 0.3 | Knauth et al. (2004) |
| CN | 3.0 × 10−8 | 0.3 | Liszt & Lucas (2001) |
| HCN | 4.0 × 10−9 | 0.3 | Liszt & Lucas (2001); Liszt & Gerin (2025) |
| HNC | 1.1 × 10−9 | 0.3 | Liszt & Lucas (2001) |
| CH3CN | 4.5 × 10−11 | 0.5 | Liszt et al. (2018), This work |
| HC3N | 2.2 × 10−11 | 0.5 | Liszt et al. (2018), This work |
| SH | 1.1 × 10−8 | 0.3 | Neufeld et al. (2015b) |
| SH+ | 1.4 × 10−9 | 0.4 | Godard et al. (2012) |
| H2S | 6.0 × 10−9 | 0.3 | Neufeld et al. (2015b) |
| CS | 3.0 × 10−9 | 0.5 | Neufeld et al. (2015b); Lucas & Liszt (2002) |
| HCS+ | 1.0 × 10−10 | 0.5 | Lucas & Liszt (2002) |
| SO | 1.0 × 10−9 | 0.5 | Neufeld et al. (2015b); Lucas & Liszt (2002) |
| H2CS | 1.5 × 10−10 | 0.5 | This work |
| CCS | 5.0 × 10−11 | 0.5 | This work |
| HF | 1.2 × 10−8 | 0.14 | Gerin et al. (2019); Sonnentrucker et al. (2015) |
| CF+ | 1.7 × 10−10 | 0.3 | Gerin et al. (2019) |
| HCl | 1.2 × 10−9 | 0.3 | Monje et al. (2013) |
| HCl+ | 1.0 × 10−9 | 0.5 | De Luca et al. (2012) |
| H2Cl+ | 9.0 × 10−10 | 0.5 | De Luca et al. (2012); Neufeld et al. (2015a) |
| ArH+ | 2.0 × 10−10 | 0.5 | Schilke et al. (2014) |
| SiO | 1.0 × 10−10 | 0.5 | Rybarczyk et al. (2023) |
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