Eur. Phys. J. D 38, 231-236 (2006)
https://doi.org/10.1140/epjd/e2006-00001-y

State-selection and orientation of CH radicals by an electric hexapole

Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka, 560-0043, Japan

Corresponding author: ^a ohyama@chem.sci.osaka-u.ac.jp

Received: 1 August 2005
Revised: 18 November 2005
Published online: 10 January 2006

Abstract

A pure and high intense pulsed supersonic CH (X²Π ) radical beam source was developed via the C(¹D) + H₂ reaction. An electrostatic hexapole field was used to state-select CH radicals. The focusing curves for the single rotational states of CH were measured for the first time by a saturated laser-induced fluorescence (SLIF) spectroscopy for the R-branch in A²Δ_3/2 ← X²Π _1/2 transition. The focusing curves were simulated by the classical trajectory simulation based on a Stark energy analysis of the rotational energy levels, including spin-orbit and Λ-doubling coupling effects. In addition, orientational distribution functions were calculated for the selectable states.