Abstract We have calculated the Stark effect of CH3F molecules in external electrical fields, the rotational population of supersonic CH3F molecules in different quantum states, and analyse the motion of weak-field-seeking CH3F molecules in a state $|J=1, KM= -1\rangle$ inside the electrical field of a Stark decelerator by using a simple analytical model. Three-dimensional Monte Carlo simulation is performed to simulate the dynamical slowing process of molecules through the decelerator, and the results are compared with those obtained from the analytical model, including the phase stability, slowing efficiency as well as the translational temperature of the slowed molecular packet. Our study shows that with a modest dipole moment (～1.85 Debye) and a relatively slight molecular weight (～34.03), CH3F molecules in a state $|J=1, KM= -1\rangle$ are a good candidate for slowing with electrostatic field. With high voltages of ±10 kV applied on the decelerator, molecules of 370 m/s can be brought to a standstill within 200 slowing stages.
Received: 14 April 2008
Revised: 22 May 2008
Accepted manuscript online:
PACS:
33.57.+c
(Magneto-optical and electro-optical spectra and effects)
Fund: Project
supported by the National Natural Science Foundation of China (Grant
Nos 10374029, 10434060 and 10674047), the National Key Basic
Research and Development Program of China (Grant No 2006CB921604),
and the Basic Key Program of Shanghai Municipality
Cite this article:
Deng Lian-Zhong(邓联忠), Fu Guang-Bin(符广彬), and Yin Jian-Ping(印建平) Theoretical study of slowing supersonic CH3F molecular beams using electrostatic Stark decelerator 2009 Chin. Phys. B 18 149
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