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

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

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.

Keywords: cold molecules photodissociation molecular orientation

Received: 22 December 2016
Revised: 22 February 2017
Accepted manuscript online:

PACS:	37.10.Mn	(Slowing and cooling of molecules)
	37.90.+j	(Other topics in mechanical control of atoms, molecules, and ions)
	33.80.Gj	(Diffuse spectra; predissociation, photodissociation)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11504112, 91536218, and 11604100).

Corresponding Authors: Lian-Zhong Deng
E-mail: lzdeng@phy.ecnu.edu.cn

Cite this article:

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 2017 Chin. Phys. B 26 053702

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

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