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Sympathetic cooling is one of the most promising techniques for producing ultracold molecules from precooled molecules. Previous researches have shown that it is inadequate to use the ultracold alkali-metal atoms as coolant for sympathetic cooling. To explore the possibility of ultracold alkali-earth-metal atoms as coolant, in this paper a theoretical investigation is performed of the cold collision dynamics for Xe-NH(X3∑-) system in magnetic fields. The interaction potential energies of Xe-NH complex are calculated respectively by using the single and double excitation coupled-cluster theory with the noniterative treatment of triple excitations[CCSD(T)] method and complete basis set limit extrapolated method. An analytic express of potential energy surface (PES) is given for the first time. A single global minimum value occurs at R=7.14a0, θ=102.76° with an energy of-153.54 cm-1, and the PES has a weak anisotropy. Combine the ab initio PES with quantum scattering theory, then the cold collisional dynamics of Xe-NH system in a magnetic field will be studied. The elastic and inelastic transition cross sections and their ratios of NH molecules in the lowest low-field following state (n=0, mj=1) under different magnetic fields and collisional energies are calculated. The results show that the elastic cross section is independent of magnetic field, and the inelastic cross section changes with magnetic field, especially at an ultracold temperature. A common rule of thumb is that to successfully implement cooling, the ratio of elastic cross section to inelastic cross section needs to reach 100 at least. The results suggest that it is likely to be a challenging work to perform sympathetic cooling of NH molecule by ultracold Xe atom.
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Keywords:
- Xe-NH complex /
- sympathetic cooling /
- cold atom-molecule collision
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[19] Bytautas L, Ruedenberg K 2008 J. Chem. Phys. 128 214308
[20] Bukowski R, Sadlej J, Jeziorski B, Jankowski P, Szalewicz K, Kucharski S A, Williams H L, Rice B M 1999 J. Chem. Phys. 110 3785
[21] Guillon G, Stoecklin T, Voronin A 2008 Phys. Rev. A. 77 042718
[22] Manolopoulos D E 1986 J. Chem. Phys. 85 6425
[23] Volpi A, Bohn J L 2002 Phys. Rev. A 65 052712
[24] Wallis A O G, Huston J M 2009 Phys. Rev. Lett. 103 183201
[25] Tiesinga E, Verhaar B J, Stoof H T C 1993 Phys. Rev. A 47 4114
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[1] Zwierlein M W, Stan C A, Schunck C H, Raupach S M F, Gupta S, Hadzibabic Z, Ketterle W 2003 Phys. Rev. Lett. 91 250401
[2] Sage J M, Sainis S, Bergeman T, Demille D 2005 Phys. Rev. Lett. 94 203001
[3] Ni K K, Ospelkaus S, de Miranda M H G, Péer A, Neyenhuis B, Zirbel J J, Kotochigova S, Julienne P S, Jin D S, Ye J 2008 Science 322 231
[4] Ospelkaus S, Ni K K, Wang D, de Miranda M H G, Neyenhuis B, Qúeméner G, Julienne P S, Bohn J L, Jin D S, Ye J 2010 Science 327 853
[5] Park J W, Will S A, Zwierlein M W 2015 Phys. Rev. Lett. 114 205302
[6] Weinstein J D, de Carvalho R, Guillet T, Friedrich B, Doyle J M 1998 Nature 395 148
[7] Bethlem H L, Meijer G 2003 Int. Rev. Phys. Chem. 22 73
[8] Fu M K, Ma H T, Cao J W, Bian W S 2016 J. Chem. Phys. 144 184302
[9] Xia W S, Fu M K, Ma H T, Bian W S 2017 Chem. Phys. 485 29
[10] Krems R V, Stwalley W C, Friedrich B 2009 Cold Molecules: Theory, Experiment, Applications (London: Taylor & Francis) p651
[11] Modugno G, Ferrari G, Roati G, Brecha R J, Simoni A, Inguscio M 2001 Science 294 1320
[12] SoldánP, Hutson J M 2004 Phys. Rev. Lett. 92 163202
[13] Hummon M T, Yeo M, Stuhl B K, Collopy A L, Xia Y, Ye J 2013 Phys. Rev. Lett. 110 143001
[14] de Carvalho R, Doyle J M, Friedrich B, Guillet T, Kim J, Patterson D, Weinstein J D 1999 Eur. Phys. J. D 7 289
[15] Żuchowski P S, Hutson J M 2008 Phys. Rev. A 78 022701
[16] Barker P F, Purcell S M, Douglas P, Barletta P, Coppendale N, Maher-McWilliams C, Tennyson J 2009 Faraday Discuss. 142 175
[17] Barletta P, Tennyson J, Barker P F 2009 New J. Phys. 11 055029
[18] González-Martínez M L, Huston J M 2013 Phys. Rev. Lett. 111 203004
[19] Bytautas L, Ruedenberg K 2008 J. Chem. Phys. 128 214308
[20] Bukowski R, Sadlej J, Jeziorski B, Jankowski P, Szalewicz K, Kucharski S A, Williams H L, Rice B M 1999 J. Chem. Phys. 110 3785
[21] Guillon G, Stoecklin T, Voronin A 2008 Phys. Rev. A. 77 042718
[22] Manolopoulos D E 1986 J. Chem. Phys. 85 6425
[23] Volpi A, Bohn J L 2002 Phys. Rev. A 65 052712
[24] Wallis A O G, Huston J M 2009 Phys. Rev. Lett. 103 183201
[25] Tiesinga E, Verhaar B J, Stoof H T C 1993 Phys. Rev. A 47 4114
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