Decelerating and bunching molecules with pulsed traveling optical lattices

Dong, Guangjiong; Lu, Weiping; Barker, P. F.

doi:10.1103/physreva.69.013409

Cited by 34 publications

(37 citation statements)

References 49 publications

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“…Besides manifold applications in optical spectroscopy, in particular, biological systems such as amino acids, 1-3 DNA bases, 4 and peptides, 5,6 supersonic jets are utilized in a multitude of current research topics. [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] Without doubt, these applications would benefit a lot if they could employ precooled molecules with minimum velocity dispersion. 8,9 In parallel, the generation of cold molecules has developed into a hot topic with a large variety of experimental approaches.…”

Section: Introductionmentioning

confidence: 99%

Efficient cooling in supersonic jet expansions of supercritical fluids: CO and CO2

Christen

Rademann

Even

2006

The Journal of Chemical Physics

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Pulsed, supersonic beams of pure carbon monoxide and carbon dioxide at stagnation conditions above their critical point have been investigated by time-of-flight measurements as a function of pressure and temperature. Although both molecules form clusters readily in adiabatic expansions, surprisingly large speed ratios (above 100) indicative of very low translational temperatures (below 0.1 K) have been achieved. In particular, the supersonic expansion of CO(2) at stagnation temperatures slightly above the phase transition to the supercritical state results in unprecedented cold beams. This efficient cooling is attributed to the large values of the heat capacity ratio of supercritical fluids in close vicinity of their critical point.

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Section: Introductionmentioning

confidence: 99%

Efficient cooling in supersonic jet expansions of supercritical fluids: CO and CO2

Christen

Rademann

Even

2006

The Journal of Chemical Physics

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“…An accelerator [22] and a decelerator [23] for atoms and molecules using pulsed traveling standing waves with increasing and decreasing velocities, respectively, were discussed. Furthermore, the possibility of slowing down and bunching molecules by means of a traveling potential with a constant velocity was studied [24]. These theoretical studies were followed by experimental realizations.…”

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confidence: 99%

Rotational-State-Dependent Dispersion of Molecules by Pulsed Optical Standing Waves

et al. 2015

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We report on the rotational-state-dependent, transverse acceleration of CS 2 molecules affected by pulsed optical standing waves. The steep gradient of the standing wave potential imparts far stronger dipole forces on the molecules than propagating pulses do. Moreover, large changes in the transverse velocities (i.e., up to 80 m=s) obtained with the standing waves are well reproduced in numerical simulations using the effective polarizability that depends on the molecular rotational states. Our analysis based on the rotationalstate-dependent effective polarizability can therefore serve as a basis for developing a new technique of state selection for both polar and nonpolar molecules.

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“…In the latter case, it was shown that, by m odeling the flam e gas as a m ixture o f the dom inant com ponents (N 2, H, O, CO), the line shape in the collisionless regim e is only w eakly sensitive to the exact gas com position. R ecent developm ents of the technique include the use o f optical gratings form ed by pum p beam s w ith different frequencies to m odify the velocity distri bution o f m olecules [27,28], and the theoretical exploitation o f the high-intensity regim e [29,30] .…”

Section: Introductionmentioning

confidence: 99%

Coherent and spontaneous Rayleigh-Brillouin scattering in atomic and molecular gases and gas mixtures

et al. 2010

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We study Rayleigh-Brillouin scattering in gases of N2, O2, and SF6 molecules, Kr atoms, and He-Xe and He-CO2 mixtures at pressures ranging from 1 to 3 bar and using two different experimental setups. In one setup, we measure spectra of light scattered by thermal density fluctuations (spontaneous Rayleigh-Brillouin scattering); in the second setup density waves are induced in the overlap region of two counterpropagating laser beams (coherent Rayleigh-Brillouin scattering). We compare measured spectra to the Tenti models and to a recent model for mixtures. We find new values of the bulk viscosity, which is a parameter in line-shape models that allows for internal degrees of freedom. Both experiments agree on the value of the bulk viscosity. Our results indicate a need for new line-shape models for mixtures of molecules with internal degrees of freedom.

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Decelerating and bunching molecules with pulsed traveling optical lattices

Cited by 34 publications

References 49 publications

Efficient cooling in supersonic jet expansions of supercritical fluids: CO and CO2

Efficient cooling in supersonic jet expansions of supercritical fluids: CO and CO2

Rotational-State-Dependent Dispersion of Molecules by Pulsed Optical Standing Waves

Coherent and spontaneous Rayleigh-Brillouin scattering in atomic and molecular gases and gas mixtures

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