First Results from the KState MOTRIMS Experiment For

First Results from the K-State MOTRIMS Experiment For the first round of experiments, we chose to study 6 ke. V Cs+ + Rb(5 s), Rb(5 p). [Note we get both states of Rb as a consequence of the cooling and trapping lasers. ] What follows are a few key slides, briefly showing the setup, and some results.

EXPERIMENTAL SETUP Re-Pump LASER Trapping LASER eam B Ion eter m o ctr Spe Recoil Ion 2 D-PSD Projectile 2 D-PSD tor Ele Faraday cup c tati s ctro lec def Anti-Helmholtz Coil

BEAM LINE Einzel lens Projectile PSD and F. cup Recoil ion Spectrometer Ion gun MOT viewer Recoil ion PSD Electrostatic deflector

COLD RUBIDIUM ATOM CLOUD Ø Our first ever MOT April 6 th , 2000 Beam aperture The rubidium cloud is a 0. 6 mm diameter sphere with a few 1010 atoms/cm 3 density 2 cm Trapped atoms

Determination of MOT Temperature The “drop & recapture” technique was used to roughly determine the temperature of the Rb MOT. Result: 129 K 50 K.

Relevant Energy Level Diagram for Rb-Cs Collisions

2 -D plot showing scattering angle vs. Q-value Note the structure in the scattering angle for the 5 s-6 s line.

Counts vs Q-value The Q-value is used to identify the initial and final states in the collisions. The red labels are used to identify capture from excited Rb atoms, while blue labels are used to identify capture from ground state Rb atoms

Uncorrected x-y data for Rb(5 s)-Cs(6 s) transition Same as at left, but corrected for B-field distortion