Open Access
Table A.1
Glossary of symbols with units used in this paper.
| Symbol | Unit | Explanation |
|---|---|---|
| nd | cm−3 | total dust number density |
| a | cm | radius of a dust grain |
| f (a) | cm−1 | dust size distribution function, normalized by ∫ f(a) da = 1 |
| nd, j | cm−3 | dust number density in size bin j |
| āj | cm | mean radius of dust grains in size bin j |
| M | representation of a (charged) molecule | |
| Z, Z+, Z− | representation of positively charged, neutral, and negatively charged dust grains | |
| [Z] | cm−3 | volume concentration of a species, here of the neutral grains |
| q | – | charge of a grain in elementary charges |
| qmax | – | maximum amount of positive/negative charges on a grain |
| fj(q) | – | discrete charge distribution function in size bin j, normalized by ∑q fj(q) = 1 |
| Q | cm−3 | total amount of charges on all dust grains per volume, ∑j nd,j ∑q q fj(q) |
| <qj> | – | mean charge of dust grains in size bin j, ∑q qfj(q) |
| kph(q) | s−1 | rate coefficient for photoionization |
| ke(q) | s−1cm−3 | rate coefficient for electron attachment |
 |
s−1cm−3 | rate coefficient for charge exchange with molecule M |
 |
representation of the dust charge moments in size bin j | |
| [Zm, j] | cm−3 | volume concentration of a dust charge moment in size bin j, here the neutral moment |
| km, j,ph | s−1 | rate coefficient for photoionization of neutral moment Zm,j |
 |
s−1 | rate coefficient for photoionization of negative moment  |
| km, j,e | s−1cm−3 | rate coefficient for electron attachment to neutral moment Zm,j |
 |
s−1cm−3 | rate coefficient for electron attachment to positive moment  |
 |
s−1cm−3 | rate coefficient of charge exchange between neutral moment Zmj and molecule M |
 |
s−1cm−3 | rate coefficient of charge exchange between negative moment  and molecule M |
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