A Multistage Optical Stark Decelerator for use with a Pulsed Molecular Beam with an Electrostatic Storage Ring

Xia, Yong; Yin, Yin; Xiang, Ji; Yin, Jianping

doi:10.1088/0256-307x/29/5/053701

Cited by 7 publications

(7 citation statements)

References 17 publications

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“…Scientific interest in cold molecules has been strong for decades due to their important applications in a wide range of research areas, like high-resolution Doppler-free spectroscopy for optical frequency standards [1] or molecular clocks, [2] precision measurement of physical constants, [3] cold collision, [4] and cold chemistry. [5] By using their interaction with external fields, like electrical, [6][7][8][9][10][11][12][13][14] magnetic, [15][16][17][18][19][20] or even electromagnetic ones, [21][22][23][24][25][26][27] cold molecules from supersonic expansion, moving with high kinetic energy but in well-defined direction, can be effectively decelerated. So far, precise velocity control of the decelerated molecules has been experimentally demonstrated with either the electrostatic Stark decelerator or the Zeeman decelerator.…”

Section: Introductionmentioning

confidence: 99%

Optical Stark deceleration of neutral molecules from supersonic expansion with a rotating laser beam

2018

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Cold molecules have great scientific significance in high-resolution spectroscopy, precision measurement of physical constants, cold collision, and cold chemistry. Supersonic expansion is a conventional and versatile method to produce cold molecules with high kinetic energies. We theoretically show here that fast-moving molecules from supersonic expansion can be effectively decelerated to any desired velocity with a rotating laser beam. The orbiting focus spot of the red-detuned laser serves as a two-dimensional potential well for the molecules. We analyze the dynamics of the molecules inside the decelerating potential well and investigate the dependence of their phase acceptance by the potential well on the tilting angle of the laser beam. ND 3 molecules are used in the test of the scheme and their trajectories under the impact of the decelerating potential well are numerically simulated using the Monte Carlo method. For instance, with a laser beam of 20 kW in power focused into a pot of 40 µm in waist radius, ND 3 molecules of 250 m/s can be brought to a standstill by the decelerating potential well within a time interval of about 0.73 ms. The total angle covered by the rotating laser beam is about 5.24 • with the distance travelled by the potential well being about 9.13 cm. In fact, the molecules can be decelerated to any desired velocity depending on the parameters adopted. This scheme is simple in structure and easy to be realized in experiment. In addition, it is applicable to decelerating both molecules and atoms.

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Section: Introductionmentioning

confidence: 99%

Optical Stark deceleration of neutral molecules from supersonic expansion with a rotating laser beam

2018

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“…[3][4][5] A variety of methods have been invented to create cold molecules. For instance, (ac) Stark decelerating [6][7][8] and Zeeman slowing [9] have been developed to the slow molecular beam to be a few meters per second with ∼mK temperature, while velocity filtering [10] and buffer gas cooling [11] have produced cold samples at tens of meters per second with ∼K temperature. Photo dissociation [12,13] and Feshbach resonance techniques [14,15] have also been successfully used to prepare ultra-cold molecular samples, but their lifetime is general short due to intermolecular collisions.…”

Section: Introductionmentioning

confidence: 99%

BaF radical: A promising candidate for laser cooling and magneto-optical trapping

Wei

Xia

et al. 2017

Chinese Phys. B

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Recently, there have been great interest and advancement in the field of laser cooling and magneto-optical trapping of molecules. The rich internal structure of molecules naturally lends themselves to extensive and exciting applications. In this paper, the radical 138 Ba 19 F, as a promising candidate for laser cooling and magneto-optical trapping, is discussed in detail. The highly diagonal Franck-Condon factors between the X 2 Σ + 1/2 and A 2 Π 1/2 states are first confirmed with three different methods. Afterwards, with the effective Hamiltonian approach and irreducible tensor theory, the hyperfine structure of the X 2 Σ + 1/2 state is calculated accurately. A scheme for laser cooling is given clearly. Besides, the Zeeman effects of the upper (A 2 Π 1/2 ) and lower (X 2 Σ + 1/2 ) levels are also studied, and their respective g factors are obtained under a weak magnetic field. Its large g factor of the upper state A 2 Π 1/2 is advantageous for magneto-optical trapping. Finally, by studying Stark effect of BaF in the X 2 Σ + 1/2 , we investigate the dependence of the internal effective electric field on the applied electric field. It is suggested that such a laser-cooled BaF is also a promising candidate for precision measurement of electron electric dipole moment.

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“…[6][7][8][9] Continuing efforts in search of new methods for the production of cold atoms and molecules have never ceased. [10][11][12][13][14][15][16][17] In 2007, Matthews et al [18] proposed that cold oxygen atoms could be made with zero mean velocity in the laboratory frame by photodissociating NO 2 molecules.…”

Section: Introductionmentioning

confidence: 99%

Production of cold CN molecules by photodissociating ICN precursors in brute-force field

Xu¹,

Yang²,

Deng³

2017

Chinese Phys. B

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We theoretically investigate the production of cold CN molecules by photodissociating ICN precursors in a brute-force field. The energy shifts and adiabatic orientation of the rotational ICN precursors are first investigated as a function of the external field strength. The dynamical photofragmentation of ICN precursors is numerically simulated for cases with and without orienting field. The CN products are compared in terms of their velocity distributions. A small portion of the CN fragments are recoiled to near zero speed in the lab frame by appropriately selecting the photo energy for dissociation. With a precursor ICN molecular beam of ∼ 1.5 K in rotational temperature, the production of low speed CN fragments can be improved by more than 5 times when an orienting electrical field of 100 kV/cm is present. The corresponding production rate for decelerated fragments with speeds ≤ 50 m/s is simulated to be about ∼2.1×10 −4 and CN number densities of 10 8 -10 10 cm −3 can be reached with precursor ICN densities of ∼10 12 -10 14 cm −3 from supersonic expansion.

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A Multistage Optical Stark Decelerator for use with a Pulsed Molecular Beam with an Electrostatic Storage Ring

Cited by 7 publications

References 17 publications

Optical Stark deceleration of neutral molecules from supersonic expansion with a rotating laser beam

Optical Stark deceleration of neutral molecules from supersonic expansion with a rotating laser beam

BaF radical: A promising candidate for laser cooling and magneto-optical trapping

Production of cold CN molecules by photodissociating ICN precursors in brute-force field

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