Table 1
Spectroscopic constants of the ground-vibrational state of doubly deuterated DME for the two different conformers.
| Parameters | Symmetric | Asymmetric |
|---|---|---|
| conformer | conformer | |
| Pure Rotation | ||
| A (MHz) | 31 492.87567(43) | 34 199.90529(31) |
| B (MHz) | 9226.37143(19) | 8976.84575(12) |
| C (MHz) | 8256.93333(16) | 7984.12140(11) |
| ΔJ (kHz) | 8.18522(15) | 7.001791(72) |
| ΔJK (kHz) | −6.03171(74) | −12.80820(49) |
| ΔK (kHz) | 167.2067(20) | 208.1287(14) |
| δJ (kHz) | 1.541683(51) | 1.335158(25) |
| δK (kHz) | −31.8881(24) | −4.1331(15) |
| ΦJ (Hz) | 0.007359(31) | 0.003928(15) |
| ΦJK (Hz) | 0.1469(29) | 0.0908(12) |
| ΦKJ (Hz) | −2.5745(84) | −2.8404(39) |
| ΦK (Hz) | 5.8044(60) | 6.8016(32) |
| ϕJ (Hz) | 0.003775(15) | 0.001907(68) |
| ϕJK (Hz) | 0.50088(97) | 0.10031(62) |
| ϕK (Hz) | 1.779(83) | 2.857(41) |
| Tunneling terms | ||
| ρ | 0.17032(43) | 0.19123(14) |
| β (deg) | 10.935(47) | 8.718(19) |
| α (deg) | 0.0(a) | 0.0(b) |
| ε10 (MHz) | −2.1814(73) | −2.4740(42) |
 (kHz) |
0.443(65) | 0.438(49) |
 (kHz) |
0.0626(92) | 0.0805(40) |
| V3 (c)(102cm−1) | 9.014(30) | 9.044(15) |
| Lines fitted(d) | 1451 | 2080 |
| J(max), Ka(max) | 88, 27 | 74, 25 |
| Lworst (e) | −4.4 | −4.8 |
| n (f) | 20 | 20 |
| σfit (gf) (MHz) | 0.080 | 0.077 |
| σw (h) | 1.09 | 1.01 |
Notes. Numbers in parentheses are one standard deviation in the same units as the last digit. (a)By symmetry. (b)Assumed, see Sect. 4 in Richard et al. (2013). (c)Barrier height for rotation of the methyl group determined with the program BARRIER. See Sect. 4 for uncertainties regarding the computation. (d)Number of distinct lines in the fit. (e)(o. − c.)∕error of the poorest fit line. (f)Number of free parameters used in the fit. (g)Standard deviation of the fit. (h)Weighted standard deviation of the fit.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.