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Precise measurements of rotational constants of the pure long range state of ultracold cesium molecules

Ma Jie Chen Peng Liu Wen-Liang Feng Guo-Sheng Li Yu-Qing Wu Ji-Zhou Xiao Lian-Tuan Jia Suo-Tang

Precise measurements of rotational constants of the pure long range state of ultracold cesium molecules

Ma Jie, Chen Peng, Liu Wen-Liang, Feng Guo-Sheng, Li Yu-Qing, Wu Ji-Zhou, Xiao Lian-Tuan, Jia Suo-Tang
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  • Received Date:  16 June 2013
  • Accepted Date:  21 August 2013
  • Published Online:  20 November 2013

Precise measurements of rotational constants of the pure long range state of ultracold cesium molecules

  • 1. State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China
Fund Project:  Project supported by the National Basic Research Program of China (Grant No. 2012CB921603), the National Natural Science Foundation of China (Grant Nos. 61008012, 10934004), the National High Technology Research and Development Program of China (Grant No. 2011AA010801), the Funds for International Cooperation and Exchange of the National Natural Science Foundation of China (Grant No. 2011DFA12490), the New Teacher Fund of the Ministry of Education of China (Grant No. 20101401120004), and the Natural Science Foundation for Young Scientists of Shanxi Province, China (Grant No. 2013021005-1).

Abstract: The high resolution spectrum of ultracold Cs2 pure long range 0g- state is experimentally measured using modulated trap loss spectroscopic technology. Based on Double photoassociation spectroscopic technique, precise frequency difference reference signals are constructed to accurately calibrate the resonant frequency intervals of the ro-vibrational levels, thus obtaining the relationship between the frequency interval of rotational level and the rotational quantum number. The experimental data are fitted by the non-rigid rotational model, and the molecular rotational constants corresponding to different vibrational levels in the ultracold Cs2 pure long range 0g- state are acquired. The experimental results demonstrate a linear decrease of the rotational constant with the increase of vibrational quantum number, and the linear decreasing rate is -0.41m MHz0.01 MHz.

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