On the vibrational spectrum and the vibrational partition function 
of dimethylamine (DMA)


Experimental fundamental data were taken from: 
(1) G. Gamer and H. Wolff, 
Spectrochim. Acta A 29 (1973) 129 - 137
https://doi.org/10.1016/0584-8539(73)80015-7 
 
(gas phase data)

(2) J. R. Durig, M. G. Griffin, and P. Groner, 
J. Phys. Chem. 81 (1977) 554 - 559
https://doi.org/10.1063/1.434321 
 
(gas phase data)


Not all fundamentals were identified experimentally. 
One important reason is that several are very weak, 
and they are often blended. 

Quantum-chemical data (B3LYP/aug-cc-pVTZ; anharmonic) were taken from: 
(3) H. S. P. Müller, R. T. Garrod, A. Belloche, V. M. Rivilla, K. M. Menten, 
I. Jiménez-Serra, J. Martín-Pintado, F. Lewen, and S. Schlemmer, 
Mon. Not. R. Astron. Soc. 523 (2023) 2887–2917.
https://doi.org/10.1093/mnras/stad1549 

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There are 24 fundamentals in DMA. 
7 are above 2900 cm-1 and have not been considered 
as their population is negligible at 300 K.

Evib   source
 219.4  (2)
 256.3  (2)
 383    (2)
 735    (1)
 929    (2)
1026    (3)
1078    (3)
1123    (2)
1159    (2)
1240    (1,2)
1412    (3)
1438    (3)
1438    (3)
1449    (3)
1460    (3)
1476    (3)
1479    (3)

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T (K)   Q(vib)
300.0   2.7773
250.0   2.0932
225.0   1.8313
200.0   1.6117
180.0   1.4627
170.0   1.3964
160.0   1.3353
150.0   1.2793
140.0   1.2284
125.0   1.1615
100.0   1.0757
 75.0   1.0232
 50.0   1.0025
 37.5   1.0003
 18.75  1.0000
  9.375 1.0000
  5.000 1.0000
  2.725 1.0000