Production of CH (A2Δ) by multi-photon dissociation of (CH3)2CO, CH3NO2, CH2Br2, and CHBr3 at 213 nm

doi:10.1088/1674-1056/23/8/083701

Abstract In order to realize electrostatic Stark deceleration of CH radicals and study cold chemistry, the fifth harmonic of a YAG laser is used to prepare CH (A²Δ) molecules through using the multi-photon dissociation of (CH₃)₂CO, CH₃NO₂, CH₂Br₂, and CHBr₃ at ~213 nm. The CH product intensity is measured by using the emission spectrum of CH (A²Δ→X²Π). The dependence of fluorescence intensity on laser power is studied, and the probable dissociation channels are analyzed. The relationship between the fluorescence intensity and some parameters, such as the temperature of the beam source, stagnation pressure, and the time delay between the opening of pulse valve and the photolysis laser, are also studied. The influence of three different carrier gases on CH signal intensity is investigated. The vibrational and rotational temperatures of the CH (A²Δ) product are obtained by comparing experimental data with the simulated ones from the LIFBASE program.

Keywords: fifth harmonic of YAG laser photodissociation emission spectrum

Received: 29 December 2013
Revised: 21 February 2014
Accepted manuscript online:

PACS:	37.10.Pq	(Trapping of molecules)
	37.10.Mn	(Slowing and cooling of molecules)
	37.10.Vz	(Mechanical effects of light on atoms, molecules, and ions)
	37.20.+j	(Atomic and molecular beam sources and techniques)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 10674047, 10804031, 10904037, 10904060, 10974055, 11034002, 11274114, and 61205198), the National Key Basic Research and Development Program of China (Grant Nos. 2006CB921604 and 2011CB921602), and the Basic Key Program of Shanghai Municipality, China (Grant No. 07JC14017), the Fundamental Research Funds for the Central Universities, and the Shanghai Leading Academic Discipline Project, China (Grant No. B408).

Corresponding Authors: Yin Jian-Ping
E-mail: jpyin@phy.ecnu.edu.cn

Cite this article:

Li Sheng-Qiang (李胜强), Xu Liang (许亮), Chen Yang-Qin (陈扬骎), Deng Lian-Zhong (邓联忠), Yin Jian-Ping (印建平) Production of CH (A²Δ) by multi-photon dissociation of (CH₃)₂CO, CH₃NO₂, CH₂Br₂, and CHBr₃ at 213 nm 2014 Chin. Phys. B 23 083701

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Production of CH (A2Δ) by multi-photon dissociation of (CH3)2CO, CH3NO2, CH2Br2, and CHBr3 at 213 nm

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Production of CH (A²Δ) by multi-photon dissociation of (CH₃)₂CO, CH₃NO₂, CH₂Br₂, and CHBr₃ at 213 nm