GAS PHASE ROVIBRATIONAL SPECTROSCOPY OF DMSO, PART.I: WHEN A SYNCHROTRON SOURCE REVEALS AN UNUSUAL ROTATIONAL BEHAVIOUR

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Many of us have enjoyed the spectacle of a spinning top influenced by friction: rotating rapidly about a stable stationary axis, the top loses slowly its angular momentum j (and energy), slows down gradually, and then, suddenly, its axis becomes unstable, the top wobbles, and an abrupt change of the top's position follows. In other words, the system undergoes a bifurcation. In the case of the tippe top, rotation about its lower point is stable at low values of angular momentum J and becomes unstable at large J. Something quite similar occurs in a freely rotating dimethylsulfoxyde (DMSO, (CH$_3$)$_2$SO) molecule. For the first time in such large polyatomic molecule a quantum bifurcation induced by a gyroscopic destabilization was observed. , \textbf{109},(094101), 2012.} This unusual phenomenon in rotational dynamics was discovered in the rovibrational states of the bending fundamental $\nu_{23}$ band of DMSO whose high-resolution gas phase absorption spectrum was observed along with that of $\nu_{11}$ by Cuisset et al. , \textbf{492},(30),2010} using the exceptional properties of the AILES beamline in the Far-Infrared domain. , \textbf{1214}, (81), 2010.}

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Author Institution: Laboratoire de Physico-Chimie de l'Atmosphere, 189A Ave. Maurice; Schumann, 59140 Dunkerque, France; Ligne AILES, synchrotron SOLEIL; L'Orme des Merisiers, Saint Aubin, BP 48, 91192 Gif-sur-Yvette, France.

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