Table 2
Rotational partition function for the symmetric and asymmetric conformers of mono-deuterated DME in the ground vibrational state computed for nine different temperatures.
Temperature | 2.275 K | 5 K | 9.375 K | 18.75 K | 37.5 K | 75 K | 150 K | 225 K | 300 K | |
|
||||||||||
Symmetric conformer | ||||||||||
A state | 58.6 | 142.5 | 361.4 | 1015.2 | 2861.7 | 8082.2 | 22 850.4 | 41 941.2 | 64 256.6 | |
E state | 58.6 | 142.5 | 361.4 | 1015.2 | 2861.7 | 8082.2 | 22 850.4 | 41 941.2 | 64 256.6 | |
Total | 117.2 | 285.0 | 722.8 | 2030.4 | 5723.5 | 16 164.3 | 45 700.8 a | 83 882.3b | 128 513.1b | |
Approx.c | 111.7 | 277.6 | 712.8 | 2016.0 | 5702.2 | 16 164.3 | 45 617.5 | 83 804.6 | 129 025.6 | |
Ratio | 1.049 | 1.027 | 1.014 | 1.007 | 1.004 | 1.002 | 1.002 | 1.001 | 0.996 | |
Asymmetric conformer | ||||||||||
A state | 119.2 | 289.6 | 734.2 | 2061.8 | 5811.8 | 16 413.5 | 46 407.7 | 85 201.7 | 130 629.7 | |
E state | 119.1 | 289.5 | 734.1 | 2061.8 | 5811.8 | 16 413.5 | 46 407.7 | 85 201.7 | 130 629.7 | |
Total | 238.3 | 579.1 | 1468.3 | 4123.7 | 11 623.5 | 32 826.9 | 92 815.4a | 170 403.4b | 261 259.3b | |
Approx.c | 226.8 | 563.7 | 1447.4 | 4093.7 | 11 578.8 | 32 749.9 | 92 630.6 | 170 173.4 | 261 999.0 | |
Ratio | 1.051 | 1.027 | 1.014 | 1.007 | 1.004 | 1.002 | 1.002 | 1.001 | 0.997 |
Notes. The data presented in bold are the results used for the astrophysical detection in Sect. 7. This table is given for the rotational degrees of freedom; the contributions from vibrational excited states are ignored.
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