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Ultracold Cs2 molecules have been formed by photoassociation. Using the multiphoton ionization technique, we measure the time-evolution of expanding process in ultracold Cs2 molecule system and obtain the decay curve of photoionization signals. Based on a simple case, where the initial distribution of atomic or molecular sample is a Gaussian function of position and of velocity, we get the sample's temperature by theoretical simulation. The result shows a reasonable agreement with the result of release-recapture method in cold atom sample. This method avoids the disadvantage of detecting the weakly fluorescence and can be widely used for measuring the temperature in cold atom or cold molecule system.
[1] Zhou S Y, Xu Z, Qu Q Z, Zhou S Y, Liu L, Wang Y Z 2009 Acta Phys. Sin. 58 1590(in Chinese) [周蜀渝, 徐震, 屈求智, 周善钰, 刘亮, 王育竹 2009 物理学报 58 1590]
[2] Anderson M H, Ensher J R, Matthews M R, Wieman C E, Cornell E A 1995 Science 269 198
[3] Ma J, Cheng P, Liu W L, Feng G S, Li Y Q, Wu J Z, Xiao L T, Jia S T 2013 Acta Phys. Sin. 62 223301(in Chinese) [马杰, 陈鹏, 刘文良, 冯国胜, 李玉清, 武寄洲, 肖连团, 贾锁堂 2013 物理学报 62 223301]
[4] Semczuk M, Li X, Gunton W, Haw M, Dattani N S, Witz J, Mills A K, Jones D J, Madison K W 2013 Phys. Rev. A 87 052505
[5] John W, Bagnato V S, Sergio Z, Julienne P S 1999 Rev. Mod. Phys. 71 1
[6] Jin D S, Ye J 2012 Chemical Reviews 112 4801
[7] Georgescu I M, Ashhab S, Nori F 2014 Rev. Mod. Phys. 86 153
[8] DeMille D 2002 Phys. Rev. Lett. 88 067901
[9] Theis M, Thalhammer G, Winkler K, Hellwig M, Ruff G, Grimm R, Hecker Denschlag J 2004 Phys. Rev. Lett. 93 123001
[10] Jones K M, Tiesinga E, Paul D L, Julienne P S 2006 Rev. Mod. Phys. 78 483
[11] Xia Y, Yin Y, Chen H, Deng L, Yin J 2008 Phys. Rev. Lett. 100 043003
[12] Marangoni B S, Menegatti C R, Marcassa L G 2010 Laser Physics 20 557
[13] Lett P D, Watts R N, Westbrook C I, Phillips W D, Gould P L, Metcalf H J 1988 Phys. Rev. Lett. 61 169
[14] He J, Wang J, Qiu Y, Wang Y H, Zhang T C, Wang J M 2008 Acta Phys. Sin. 57 6221(in Chinese) [何军, 王婧, 邱英, 王彦华, 张天才, 王军民 2008 物理学报 57 6221]
[15] Courtois J Y, Grynberg G, Lounis B, Verkerk P 1994 Phys. Rev. Lett. 72 3017
[16] Mitsunaga M, Yamashita M, Koashi M, Iomoto N 1998 Opt. Lett. 23 840
[17] Peters T, Wittrock B, Blatt F, Halfmann T, Yatsenko L P 2012 Phys. Rev. A 85 063416
[18] Wang D, Neyenhuis B, de Miranda M H G, Ni K K, Ospelkaus S, Jin D S, Ye J 2010 Phys. Rev. A 81 061404
[19] Greiner M, Regal C A, Jin D S 2003 Nature 426 537
[20] Fioretti A, Comparat D, Crubellier A, Dulieu O, Masnou-Seeuws F, Pillet P 1998 Phys. Rev. Lett. 80 4402
[21] Lambrecht A, Giacobino E, Reynaud S 1996 Quantum Semiclass. Opt. 8 457
[22] Chang X F, Ji Z H, Yuan J P, Zhao Y T, Yang Y G, Xiao L T, Jia S T 2013 Chin. Phys. B 22 093701
[23] Ji Z H, Wu J Z, Ma J, Feng Z G, Zhang L J, Zhao Y T, Wang L R, Xiao L T, Jia S T 2010 Chin. Phys. Lett. 27 053701
[24] Ji Z H, Zhang R R, Ma J, Dong L, Zhao Y T, Jia S T 2009 Chinese Journal of Lasers 36 804(in Chinese) [姬中华, 张冉冉, 马杰, 董磊, 赵延霆, 贾锁堂 2009 中国激光 36 804]
[25] Wang Y Q 2007 Laser Cooling and Trapping of Atoms (Beijing: Peking University Press) p178 (in Chinese) [王义遒2007原子的激光冷却与陷俘(北京: 北京大学出版社)第178页]
[26] Jin L, Feng G S, Wu J Z, Ma J, Wang L R, Xiao L T, Jia S T 2013 Chin. Phys. B 22 088701
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[1] Zhou S Y, Xu Z, Qu Q Z, Zhou S Y, Liu L, Wang Y Z 2009 Acta Phys. Sin. 58 1590(in Chinese) [周蜀渝, 徐震, 屈求智, 周善钰, 刘亮, 王育竹 2009 物理学报 58 1590]
[2] Anderson M H, Ensher J R, Matthews M R, Wieman C E, Cornell E A 1995 Science 269 198
[3] Ma J, Cheng P, Liu W L, Feng G S, Li Y Q, Wu J Z, Xiao L T, Jia S T 2013 Acta Phys. Sin. 62 223301(in Chinese) [马杰, 陈鹏, 刘文良, 冯国胜, 李玉清, 武寄洲, 肖连团, 贾锁堂 2013 物理学报 62 223301]
[4] Semczuk M, Li X, Gunton W, Haw M, Dattani N S, Witz J, Mills A K, Jones D J, Madison K W 2013 Phys. Rev. A 87 052505
[5] John W, Bagnato V S, Sergio Z, Julienne P S 1999 Rev. Mod. Phys. 71 1
[6] Jin D S, Ye J 2012 Chemical Reviews 112 4801
[7] Georgescu I M, Ashhab S, Nori F 2014 Rev. Mod. Phys. 86 153
[8] DeMille D 2002 Phys. Rev. Lett. 88 067901
[9] Theis M, Thalhammer G, Winkler K, Hellwig M, Ruff G, Grimm R, Hecker Denschlag J 2004 Phys. Rev. Lett. 93 123001
[10] Jones K M, Tiesinga E, Paul D L, Julienne P S 2006 Rev. Mod. Phys. 78 483
[11] Xia Y, Yin Y, Chen H, Deng L, Yin J 2008 Phys. Rev. Lett. 100 043003
[12] Marangoni B S, Menegatti C R, Marcassa L G 2010 Laser Physics 20 557
[13] Lett P D, Watts R N, Westbrook C I, Phillips W D, Gould P L, Metcalf H J 1988 Phys. Rev. Lett. 61 169
[14] He J, Wang J, Qiu Y, Wang Y H, Zhang T C, Wang J M 2008 Acta Phys. Sin. 57 6221(in Chinese) [何军, 王婧, 邱英, 王彦华, 张天才, 王军民 2008 物理学报 57 6221]
[15] Courtois J Y, Grynberg G, Lounis B, Verkerk P 1994 Phys. Rev. Lett. 72 3017
[16] Mitsunaga M, Yamashita M, Koashi M, Iomoto N 1998 Opt. Lett. 23 840
[17] Peters T, Wittrock B, Blatt F, Halfmann T, Yatsenko L P 2012 Phys. Rev. A 85 063416
[18] Wang D, Neyenhuis B, de Miranda M H G, Ni K K, Ospelkaus S, Jin D S, Ye J 2010 Phys. Rev. A 81 061404
[19] Greiner M, Regal C A, Jin D S 2003 Nature 426 537
[20] Fioretti A, Comparat D, Crubellier A, Dulieu O, Masnou-Seeuws F, Pillet P 1998 Phys. Rev. Lett. 80 4402
[21] Lambrecht A, Giacobino E, Reynaud S 1996 Quantum Semiclass. Opt. 8 457
[22] Chang X F, Ji Z H, Yuan J P, Zhao Y T, Yang Y G, Xiao L T, Jia S T 2013 Chin. Phys. B 22 093701
[23] Ji Z H, Wu J Z, Ma J, Feng Z G, Zhang L J, Zhao Y T, Wang L R, Xiao L T, Jia S T 2010 Chin. Phys. Lett. 27 053701
[24] Ji Z H, Zhang R R, Ma J, Dong L, Zhao Y T, Jia S T 2009 Chinese Journal of Lasers 36 804(in Chinese) [姬中华, 张冉冉, 马杰, 董磊, 赵延霆, 贾锁堂 2009 中国激光 36 804]
[25] Wang Y Q 2007 Laser Cooling and Trapping of Atoms (Beijing: Peking University Press) p178 (in Chinese) [王义遒2007原子的激光冷却与陷俘(北京: 北京大学出版社)第178页]
[26] Jin L, Feng G S, Wu J Z, Ma J, Wang L R, Xiao L T, Jia S T 2013 Chin. Phys. B 22 088701
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