1. First Results from the K-State MOTRIMS Experiment
For the first round of experiments, we chose to study 6 keV Cs+ + Rb(5s), Rb(5p). [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.

2. EXPERIMENTAL SETUP Re-Pump LASER Trapping LASER Anti-Helmholtz Coil
Ion Beam
Spectrometer
Recoil Ion
2D-PSD
Projectile
2D-PSD
Anti-Helmholtz
Coil
Electrostatic deflector
Faraday cup

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

4. COLD RUBIDIUM ATOM CLOUD
Our first ever MOT
April 6th ,2000
Beam aperture
Trapped atoms
The rubidium cloud is a 0.6 mm diameter sphere with a few 1010 atoms/cm3 density
2 cm

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

6. Relevant Energy Level Diagram for Rb-Cs Collisions

7. 2-D plot showing scattering angle vs. Q-value
Note the structure in the scattering angle for the 5s-6s line.

8. 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

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