Table 2
Comparison peak desorption temperatures.
| Molecule | Tp PW (K) | Tp ATD nH,7 (K) | Diff. (%) | Tp ATD nH,12 (K) | Diff. (%) |
|---|---|---|---|---|---|
| C2H4 | 45 | 43 | 96 | 54 | 119 |
| CH3CHO | 77 | 75 | 98 | 92 | 119 |
| H2CCO | 79 | 78 | 98 | 95 | 120 |
| CH2NH | 84 | 83 | 99 | 102 | 121 |
| CH3SH | 101 | 100 | 99 | 121 | 120 |
| CH3OCH3 | 101 | 99 | 98 | 121 | 120 |
| CH3NCO | 104 | 102 | 98 | 124 | 119 |
| HC2CHO | 107 | 105 | 98 | 127 | 119 |
| CH2CHOH | 108 | 106 | 98 | 129 | 120 |
| (CHO)2 | 109 | 107 | 99 | 130 | 119 |
| HCOOH | 111 | 109 | 98 | 133 | 119 |
| CH3CH2OH | 113 | 111 | 99 | 135 | 120 |
| CH3COOH | 116 | 114 | 98 | 138 | 119 |
| NH2OH | 140 | 139 | 99 | 169 | 121 |
| H2PCOOH | 144 | 143 | 99 | 172 | 119 |
| HOCH2CN | 154 | 152 | 99 | 184 | 119 |
| HCOCOOH | 158 | 157 | 99 | 188 | 119 |
| NH2CONH2 | 196 | 195 | 99 | 235 | 120 |
| S4 | 218 | 216 | 99 | 258 | 118 |
| C60 | 399 | 417 | 104 | 487 | 122 |
Notes. Peak desorption temperatures for various molecules, using the Polanyi-Wigner equation (Tp,PW, with β = 1 K century−1), and the adsorption-thermal-desorption equation (Tp,ATD), for nH = 1 × 107 cm−3 (nH,7) and nH = 1 × 1012 cm−3 (nH,12). The differences between the adsorption-thermal-desorption and Polanyi-Wigner peak desorp-tion temperatures are indicated in percent of (Tp,ATD/Tp,PW). Desorption parameters from Table 1 are used.
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