The excess molar volumes V E m of binary mixtures of {x(C4H9)2O + (1-x)H(CH2)n (OCH2CH2)3OH} for n=1, 2, and 4 have been measured as a function of mole fraction x using a continuous-dilution dilatometer at T=298.15 K. The V E m decreases in magnitude as the alkyl chain length of the alkoxyethanol in
The v10=1 Level of Propyne, H3CCCH, and Its Interactions with v9=1 and v10=2
✍ Scribed by H.S.P Müller; P Pracna; V.-M Horneman
- Publisher
- Elsevier Science
- Year
- 2002
- Tongue
- English
- Weight
- 175 KB
- Volume
- 216
- Category
- Article
- ISSN
- 0022-2852
No coin nor oath required. For personal study only.
✦ Synopsis
Almost 300 new rotational transitions within the fundamental vibrational level v 10 = 1 of propyne have been measured in selected regions between 495 and 925 GHz spanning the quantum numbers 28 ≤ J ≤ 54 and 0 ≤ K ≤ 16. The accuracies are mostly between 10 and 20 kHz. In addition, the J = 4 and 5 transitions near 85 and 103 GHz have been remeasured. Simultaneous analyses with refined rovibrational data have been performed, showing that even this lowest and seemingly isolated vibrational level needs a global treatment when high K transitions are involved. The global model with the v 10 = 1 level coupled to the next higher cluster of levels, v 10 = 2/v 9 = 1, by Fermi and Coriolis resonances is necessary for a quantitative reproduction of both the rovibrational and rotational data within their experimental uncertainties. Included are also improved ground state spectroscopic parameters from a fit of previous pure rotational data and k = 3 ground state combination loops as well as additional data obtained in course of the present study.
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