Physics – Atomic Physics
Scientific paper
2012-01-19
Physics
Atomic Physics
13 pages, 5 figures, 1 table
Scientific paper
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.
Chardonnet Christian
Darquie Benoit
Daussy Christophe
Lemarchand Cyril
Roncin Vincent
No associations
LandOfFree
Evidence for speed-dependent effects in NH3 self-broadened spectra: towards a new determination of the Boltzmann constant does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Evidence for speed-dependent effects in NH3 self-broadened spectra: towards a new determination of the Boltzmann constant, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Evidence for speed-dependent effects in NH3 self-broadened spectra: towards a new determination of the Boltzmann constant will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-254436