Production of cold CN molecules by photodissociating ICN precursors in brute-force field

doi:10.1088/1674-1056/26/5/053702

中国物理B ›› 2017, Vol. 26 ›› Issue (5): 53702-053702.doi: 10.1088/1674-1056/26/5/053702

• ATOMIC AND MOLECULAR PHYSICS • 上一篇下一篇

Production of cold CN molecules by photodissociating ICN precursors in brute-force field

Wen-Xia Xu(徐文霞), Yong-Cheng Yang(杨永成), Lian-Zhong Deng(邓联忠)

State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China

收稿日期:2016-12-22 修回日期:2017-02-22 出版日期:2017-05-05 发布日期:2017-05-05
通讯作者: Lian-Zhong Deng E-mail:lzdeng@phy.ecnu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11504112, 91536218, and 11604100).

Production of cold CN molecules by photodissociating ICN precursors in brute-force field

Wen-Xia Xu(徐文霞), Yong-Cheng Yang(杨永成), Lian-Zhong Deng(邓联忠)

State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China

Received:2016-12-22 Revised:2017-02-22 Online:2017-05-05 Published:2017-05-05
Contact: Lian-Zhong Deng E-mail:lzdeng@phy.ecnu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11504112, 91536218, and 11604100).

摘要/Abstract

摘要： We theoretically investigate the production of cold CN molecules by photodissociating ICN precursors in a brute-force field. The energy shifts and adiabatic orientation of the rotational ICN precursors are first investigated as a function of the external field strength. The dynamical photofragmentation of ICN precursors is numerically simulated for cases with and without orienting field. The CN products are compared in terms of their velocity distributions. A small portion of the CN fragments are recoiled to near zero speed in the lab frame by appropriately selecting the photo energy for dissociation. With a precursor ICN molecular beam of ～1.5 K in rotational temperature, the production of low speed CN fragments can be improved by more than 5 times when an orienting electrical field of 100 kV/cm is present. The corresponding production rate for decelerated fragments with speeds ≤ 50 m/s is simulated to be about ～2.1×10^-4 and CN number densities of 10⁸-10¹⁰ cm^-3 can be reached with precursor ICN densities of ～10¹²-10¹⁴ cm^-3 from supersonic expansion.

关键词: cold molecules, photodissociation, molecular orientation

Abstract: We theoretically investigate the production of cold CN molecules by photodissociating ICN precursors in a brute-force field. The energy shifts and adiabatic orientation of the rotational ICN precursors are first investigated as a function of the external field strength. The dynamical photofragmentation of ICN precursors is numerically simulated for cases with and without orienting field. The CN products are compared in terms of their velocity distributions. A small portion of the CN fragments are recoiled to near zero speed in the lab frame by appropriately selecting the photo energy for dissociation. With a precursor ICN molecular beam of ～1.5 K in rotational temperature, the production of low speed CN fragments can be improved by more than 5 times when an orienting electrical field of 100 kV/cm is present. The corresponding production rate for decelerated fragments with speeds ≤ 50 m/s is simulated to be about ～2.1×10^-4 and CN number densities of 10⁸-10¹⁰ cm^-3 can be reached with precursor ICN densities of ～10¹²-10¹⁴ cm^-3 from supersonic expansion.

Key words: cold molecules, photodissociation, molecular orientation

中图分类号: (Slowing and cooling of molecules)

37.10.Mn

37.90.+j (Other topics in mechanical control of atoms, molecules, and ions) 33.80.Gj (Diffuse spectra; predissociation, photodissociation)

徐文霞, 杨永成, 邓联忠. Production of cold CN molecules by photodissociating ICN precursors in brute-force field[J]. 中国物理B, 2017, 26(5): 53702-053702.

Wen-Xia Xu(徐文霞), Yong-Cheng Yang(杨永成), Lian-Zhong Deng(邓联忠). Production of cold CN molecules by photodissociating ICN precursors in brute-force field[J]. Chin. Phys. B, 2017, 26(5): 53702-053702.

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Production of cold CN molecules by photodissociating ICN precursors in brute-force field

Production of cold CN molecules by photodissociating ICN precursors in brute-force field

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