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A type of quantum oscillation—known to occur for electrons in a crystal—has now been observed in a gas of molecular rotors that are spun around by laser pulses

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  A type of quantum oscillation—known to occur for electrons in a crystal—has now been observed in a gas of molecular rotors that are spun around by laser pulses Sam Wormley <swormley1@gmail.com> - 2015-11-11 18:11 -0600
    Re: A type of quantum oscillation—known to occur for electrons in a crystal—has now been observed in a gas of molecular rotors that are spun around by laser pulses jimp@specsol.spam.sux.com - 2015-11-12 00:34 +0000

#532231 — A type of quantum oscillation—known to occur for electrons in a crystal—has now been observed in a gas of molecular rotors that are spun around by laser pulses

A type of quantum oscillation—known to occur for electrons in a 
crystal—has now been observed in a gas of molecular rotors that are spun 
around by laser pulses
> http://physics.aps.org/synopsis-for/10.1103/PhysRevLett.115.203002



> A team headed by Philip Bucksbaum from Stanford University in
> California and Ilya Averbukh from the Weizmann Institute in Israel
> looked for Bloch-like oscillations in a simpler
> system—room-temperature nitrogen molecules. They exposed a nitrogen
> gas sample to a periodic train of femtosecond laser pulses. Each
> pulse gave a little kick to the rotation, causing the molecules to
> hop from one angular momentum state to the next higher one, as if
> they were moving through a lattice in momentum space. At a certain
> point, the molecular wave packet reflected backwards (similar to the
> electron-crystal case), and the angular momentum began to decrease.
> To measure these oscillations, the team used a probe beam whose
> polarization shifted depending on how fast the molecules were
> rotating. The results agreed with the team’s numerical simulations.

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#532243

Sam Wormley <swormley1@gmail.com> wrote:
> A type of quantum oscillation?known to occur for electrons in a 
> crystal?has now been observed in a gas of molecular rotors that are spun 
> around by laser pulses
>> http://physics.aps.org/synopsis-for/10.1103/PhysRevLett.115.203002
> 
> 
> 
>> A team headed by Philip Bucksbaum from Stanford University in
>> California and Ilya Averbukh from the Weizmann Institute in Israel
>> looked for Bloch-like oscillations in a simpler
>> system?room-temperature nitrogen molecules. They exposed a nitrogen
>> gas sample to a periodic train of femtosecond laser pulses. Each
>> pulse gave a little kick to the rotation, causing the molecules to
>> hop from one angular momentum state to the next higher one, as if
>> they were moving through a lattice in momentum space. At a certain
>> point, the molecular wave packet reflected backwards (similar to the
>> electron-crystal case), and the angular momentum began to decrease.
>> To measure these oscillations, the team used a probe beam whose
>> polarization shifted depending on how fast the molecules were
>> rotating. The results agreed with the team?s numerical simulations.

So what?

 

-- 
Jim Pennino

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