Internal rotation in 1,4-dimethylnaphthalene studied by high resolution laser spectroscopy
| Autor: | Paul Uijt de Haag, Jon T. Hougen, Leo Meerts, Rudie Spooren, Maarten Ebben |
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| Rok vydání: | 1990 |
| Předmět: |
Chemistry
Resolution (electron density) Biophysics Rotational transition Rotational temperature Condensed Matter Physics Molecular electronic transition Nuclear magnetic resonance Rotational spectroscopy Physical and Theoretical Chemistry Atomic physics Laser-induced fluorescence Spectroscopy Molecular Biology Molecular beam |
| Zdroj: | Molecular Physics. 69:265-280 |
| ISSN: | 1362-3028 0026-8976 |
| DOI: | 10.1080/00268979000100181 |
| Popis: | The high resolution laser induced fluorescence spectrum of the 00 0 S 1(1 A 1) ← S 0(1 A 1) electronic transition in 1,4-dimethylnaphthalene has been studied in a molecular beam. The residual Doppler width of 12 MHz allowed rotational resolution and the study of the effects of the internal rotation of the two methyl groups. All strong lines were assigned and the rotational constants in both the ground and excited electronic states were determined. The internal rotation of the two methyl groups manifests itself in the spectrum by a splitting of each rotational transition into three lines. The splitting of the lines is 40 ± 1 MHz and constant up to J = 11 and K +1 = 11. The intensity ratio of the lines is 1:2:1 within 10 per cent. No further splittings were observed in the investigated frequency range. It is shown that the spectrum is totally explained by the simple model of two independent internal rotors attached to an asymmetric rotor frame. The effect of the interaction of the two rotors is negligible w... |
| Databáze: | OpenAIRE |
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