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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.]

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First Results from the K-State MOTRIMS Experiment


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slide1

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.

experimental setup
EXPERIMENTAL SETUP

Re-Pump LASER

Trapping

LASER

Ion Beam

Spectrometer

Recoil Ion

2D-PSD

Projectile

2D-PSD

Anti-Helmholtz

Coil

Electrostatic deflector

Faraday cup

beam line
BEAM LINE

Projectile PSD and F.cup

Recoil ion Spectrometer

Einzel lens

Ion gun

Electrostatic deflector

Recoil ion PSD

MOT viewer

cold rubidium atom cloud
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

slide5

Determination of MOT Temperature

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

slide7

2-D plot showing scattering angle vs. Q-value

Note the structure in the scattering angle for the 5s-6s line.

slide8

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

slide9

Uncorrected x-y data for Rb(5s)-Cs(6s) transition

Same as at left, but corrected for B-field distortion