Velocity-tunable slow beams of cold O2 in a single spin-rovibronic state with full angular-momentum orientation by multistage Zeeman deceleration

Cold samples of oxygen molecules in supersonic beams have been decelerated from initial velocities of 390 and 450 m s(-1) to final velocities in the range between 150 and 280 m s(-1) using a 90-stage Zeeman decelerator. (2 + 1) resonance-enhanced-multiphoton-ionization (REMPI) spectra of the 3s sigma(g) (3)Pi(g) (C) (v' = 2) <- X (3)Sigma(-)(g) (v '' = 0) two-photon transition of O-2 have been recorded to characterize the state selectivity of the deceleration process. The decelerated molecular sample was found to consist exclusively of molecules in the J '' = 2 spin-rotational component of the X (3)Sigma(-)(g) (v '' = 0, N '' =1) ground state of O-2. Measurements of the REMPI spectra using linearly polarized laser radiation with polarization vector parallel to the decelerator axis, and thus to the magnetic-field vector of the deceleration solenoids, further showed that only the M ''(J) = 2 magnetic sublevel of the N ''= 1, J '' = 2 spin-rotational level is populated in the decelerated sample, which therefore is characterized by a fully oriented total-angular-momentum vector. By maintaining a weak quantization magnetic field beyond the decelerator, the polarization of the sample could be maintained over the 5 cm distance separating the last deceleration solenoid and the detection region.