A New Desirable Molecular Species for Stark Deceleration

We demonstrate a new molecular sample (CH radical) for Stark deceleration by Monte Carlo simulation, study the dependences of the decelerating effect on the different phase angles, stage number and decelerating voltages, and obtain some new optimized conditions and parameters. We also calculate the Stark energy shift of different quantum states of CH radical in the Stark
decelerator electrostatic field and their populations in a supersonic CH molecular beam. Our study shows that the mean velocity of the supersonic CH molecular beam in the ²π_1/2 state can be decelerated from 380m/s to 24m/s, and the corresponding translation temperature is lowered from 2.8K to 27mK. It is thus clear that the CH radical is a new and desirable candidate for Stark
deceleration.