报告题目：Cold heavy molecules: photoassociation of Yb and microwave lens for PbO

报 告 人：Katsunari Enomoto （Associate Professor, University of Toyama, Japan）

报告时间：2018年9月26日（星期三）下午16:00

报告地点：物理楼313学术报告厅

报告摘要：Cold molecules in the gaseous phase are promising systems for novel spectroscopy, precision measurements for high-energy physics, and cold collision studies. In this talk, two topics regarding cold molecules will be presented: photoassociation (PA) spectroscopy of ultracold Yb atoms and control of translational motion of cold PbO beams.

PA spectroscopy of ultracold atoms is a powerful tool to investigate vibrational levels near the dissociation limit of a dimer. The scattering length, which determines the ultracold collision crosssection, can be deduced from the PA spectroscopy data. We have precisely determined the scattering lengths for all combinations of Yb isotopes by performing two-color PA spectroscopy (Fig. 1) [1]. Some other results of PA studies of Yb atoms, such as a purely long-range state due to the hyperfine interaction [2] and an optical Feshbach resonance [3], will also be presented.

To cool and trap various kinds of molecules, it is needed to develop methods to directly cool the molecules and to control the translational motion. We have proposed a molecular beam focuser and decelerator using a superconducting microwave resonator. We have made such a superconducting resonator by electroplating a Pb/Sn alloy on cylindrical copper resonator, and have confirmed that a strong microwave electric field of about 10 kV/cm can be obtained [4]. Recently, we have successfully demonstrated the focusing of cold PbO beams using the superconducting resonator.

[1] M. Kitagawa et al.,

Phys. Rev. A 77, 012719 (2008).

[2] K. Enomoto et al.,

Phys. Rev. Lett. 100, 123001 (2008).

[3] K. Enomoto et al.,

Phys. Rev. Lett. 101, 203201 (2008).

[4] K. Enomoto et al.,

Appl. Phys. B 109, 149 (2012).