A mechanical means to produce intense beams of slow molecules

Journal of Physical Chemistry A

Volumn 103, Issue 50, 1999, Pages 10670-10673

  Gupta, Manish ^a   Herschbach, Dudley ^a  

^a HARVARD UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0000968558     PISSN: 10895639     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp993560x     Document Type: Article

References (32)

1. Chu, S. Rev. Mod. Phys. 1998, 70, 685;
2. Cohen-Tannoudji, C. N. Rev. Mod. Phys. ibid. 1998, 70, 707;
3. Phillips, W. D. Rev. Mod. Phys. ibid. 1998, 70, 721.
4. Fried, D. G.; Killian, T. C.; Willmann, L.; Candhuis, D.; Moss, S. C.; Kleppner, D.; Greytak, T. J. Phys. Rev. Lett. 1998,81,3811, and work cited therein.
5. Hau, L. V.; Harris, S. E.; Dutton, Z.; Behroozi, C. H. Nature 1999, 597, 594.
6. Wieman, C. E.; Pritchard, D. E.; Wineland, D. J. Rev. Mod. Phys. 1999, 71, S263.
7. Forrey, R. C.; Balakrishnan, N.; Dalgamo, A.; Hafferty, M. R.; Heller, E. J. Phys. Rev. Lett. 1999, 82, 2657.
8. Herschbach, D. R. In Chemical Research-2000 and Beyond: Challenges and Visions; Barkan, P., Ed.; Oxford University Press: New York, 1998; p 113;
9. Rev. Mod. Phys. 1999, 71, S411.
10. Bahns, J. T.; Stwalley, W. C.; Gould, P. L. J. Chem. Phys. 1996, 104, 9689.
11. Nikolov, A. N.; Eyler, E. E.; Wang, X. T.; Li, J.; Wang, H.; Stwalley, W. C.; Gould, P. L. Phys. Rev. Lett. 1999, 82, 703, and papers cited therein.
12. Weinstein, J. D.; deCarvalho, R.; Guillet, T.; Friedrich, B.; Doyle, J. M. Nature 1998, 395, 148.
13. Bethlem, H. L.; Berden, G.; Meijer, G. Phys. Rev. Lett. 1999, 83, 1558.
14. Maddi, J. A.; Dinneen, T. P.; Gould, H. Phys. Rev. A, 1999, 60, 3882.
15. Friedrich, B. Phys. Rev. A, accepted.
16. Accelerating molecular beams by a high-speed rotor was pioneered 50 years ago by Philip Moon; see Moon, P. B. Proc. R. Soc. London A 1978. 360, 303, and work cited therein. Moon considered effusion from a hollow rotor (J. S. Simon, private communication) but opted instead to produce fast molecules by swatting.
17. For many applications it would be preferable to produce a roughly unidirectional beam rather than a 360° spray. This may be feasible by use of a fast piezoelectrically activated valve, pulsed synchronously with the rotor. For stationary sources, such a value operating at kHz frequencies has been devised by D. Gerlich, Institut für Physik, Technische Universität, Chemnitz (private communication).
18. 5 times that due to gravity.
19. Elettromeccanica, Giordano Colombo, sri, Milan.
20. Miller, D. R. In Atomic and Molecular Beam Methods, Vol. I; Scoles, G., Ed.; Oxford University Press: New York, 1988; p 14.
21. Beams, J. W. Rev. Mod. Phys. 1938, 10, 245.
22. lab cannot be reduced to zero because of swatting, most of this can be avoided by aiming the nozzle to direct the beam centerline slightly below the plane in which the rotor arm whirls. Even a small downward velocity component (∼5 m/s) allows molecules to escape swatting and can serve to carry them to a collection device, such as a storage ring.
23. Gentry, R. W. In Atomic and Molecular Beam Methods, Vol. I; Scoles, G., Ed.; Oxford University Press: New York, 1988; p 54.
24. See also Beck, S. M.; Liverman, M. G.; Monts, D. L.; Smalley, R. F. J. Chem. Phys. 1979. 70, 232.
25. Seideman, T. J. Chem. Phys. 1997, 107, 10420, and work cited therein.
26. u = hl(mu).
27. Friedrich, B.; deCarvalho, R.; Kim, J.; Patterson, D.; Weinstein, J. D.; Doyle, J. M. J. Chem. Soc., Faraday Trans. 1998, 94, 1783.
28. Jongma, R. T.; von Helden, G.; Berden, G.; Meijer, G. Chem. Phys. Lett. 1997, 170, 304.
29. Katz, D. P. J. Chem. Phys. 1997, 707, 8491.
30. Stern, O. Z. Physik 1920, 2, 29;
31. Stern, O. Z. Physik 1920, 3, 417.
32. See Ramsey, N. F. Molecular Beams; Oxford University Press: New York, 1956; p 21.