ArXiv:1104.3177 Optical pulse-shaping for internal cooling of molecules Optical pulse-shaping for internal cooling of molecules Chien-Yu Lien, Scott Williams,

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Presentation transcript:

arXiv: Optical pulse-shaping for internal cooling of molecules Optical pulse-shaping for internal cooling of molecules Chien-Yu Lien, Scott Williams, and Brian Odom Department of Physics and Astronomy, Northwestern University International Symposium on Molecular Spectroscopy 66th Meeting

Applications: Molecular clock Test on fundamental constant Quantum computation Cold chemistry. Internal Cooling !? -> Prepare molecules in desired low energy states Methods: Buffer gas cooling Supersonic expansion Stark deceleration Optical pumping.

What about rotational degree of freedom M. Viteau et al, Science, 2008, 321, 232–234.

Achieve rotational cooling in 10s of seconds P. F. Staanum et al., Nature Physics, 2010, 6, 271–274. T. Schneider et al., Nature Physics, 2010, 6, 275–278.

Apparatus – RF Paul trap pulse valve source chamber exp. chamber AlH + r 0 = 3 mm z 0 =15mm Ω rf = 2MHz Internal degrees of freedom are not cooled! Ba +

v” = 0 v” = 2 v” = 1 v’ = 0 v’ = cm K ~ 200 cm -1 Diagonal Frank-Condon factors of AlH + AlH +

Rotational optical pumping in AlH + K’ J’ K” J” P −+−+ +−+− −+− −−−− + −−−− pumping decay

Mirror Grating Mask Mirror Concave Mirror Pulse shaping Pillet’s group cooled the vibrational DOF with this technique

Better than the required 10 cm -1 for cooling AlH +

Data

PROC (Pulse-shaped Rotational Optical Cooling)

Rate Equation Simulation

1 + 1’ REMPD state readout M. F. Guest and D. M. Hlrst, Chemical Physics Letters, 1981, 84, 167. P. J. Bruna and F. Grein, Physical Chemistry Chemical Physics, 2003, 5, 3140.

Conclusions This scheme cools internal DOF in 10μs compared to 10s of seconds Complementary to the work of Drewsen and Schiller’s groups Advantage of choosing AlH + : Diagonal FCFs Simple pulse-shaping Extension to other molecules: A second fs laser to repump v” > 0 population

Current Progress Pulse-shaped laser ready AlH sample generation ready Ion trap ready Vacuum system ready Next: start trapping!

More info.-- arXiv: Acknowledgement Thanks to: Prof. Brian Odom Scott Williams – laser spectrum Dr. Jason Nguyen – simulation Chris Seck And your attention!!

Addition slides in the back