تقرير
Evidence for speed-dependent effects in NH3 self-broadened spectra: towards a new determination of the Boltzmann constant
| العنوان: | Evidence for speed-dependent effects in NH3 self-broadened spectra: towards a new determination of the Boltzmann constant |
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| المؤلفون: | Triki, Meriam, Lemarchand, Cyril, Darquié, Benoît, Sow, Papa Lat Tabara, Roncin, Vincent, Chardonnet, Christian, Daussy, Christophe |
| المصدر: | Physical Review A 85, 6 (2012) 062510 |
| سنة النشر: | 2012 |
| المجموعة: | Physics (Other) Quantum Physics |
| مصطلحات موضوعية: | Physics - Atomic Physics, Quantum Physics |
| الوصف: | In this paper we present an accurate analysis of the shape of an isolated rovibrational ammonia line from the strong nu2 band around 10 $\mu$m, recorded by laser absorption spectroscopy. Experimental spectra obtained under controlled temperature and pressure, are confronted to various models that take into account Dicke narrowing or speed-dependent effects. Our results show clear evidence for speed-dependent broadening and shifting, which had never been demonstrated so far in NH3. Accurate lineshape parameters of the nu2 saQ(6,3) line are obtained. Our current project aiming at measuring the Boltzmann constant, kB, by laser spectroscopy will straight away benefit from such knowledge. We anticipate that a first optical determination of kB with a competitive uncertainty of a few ppm is now reachable. Comment: 13 pages, 5 figures, 1 table |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevA.85.062510 |
| URL الوصول: | http://arxiv.org/abs/1201.4087 |
| رقم الأكسشن: | edsarx.1201.4087 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevA.85.062510 |
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