Excited State Fractions in a MOT

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Excited State Fractions in a MOT
Excited State Fractions in a MOT

• How Camp
• 17 September, 2003

How Camp 17 September, 2003
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Er, Whats a MOT?
Er, Whats a MOT?
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Why Do We Care About f ?
Why Do We Care About f ?

• Understand Initial Conditions

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How Would We Do It?
How Would We Do It?
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So, Whats the Problem!?
So, Whats the Problem!?
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So, Whats the Problem!?
So, Whats the Problem!?
Beam Symmetry?
I2 0.45 mW / cm2
B-Field Gradient?
I1 0.50 mW / cm2
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Then How Do We Find f ?
Then How Do We Find f ?
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How Do We Find f ?
How Do We Find f ?
TAC Spectra
Q Value Spectra
7KeV Na Rb(5s), Rb(5p)
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How Do We Find f ?
How Do We Find f ?
Ason ? ?s nson Ton
Asoff ? ?s nsoff Toff
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How Do We Find f ?
How Do We Find f ?
nson npon nsoff
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The Detuning Experiment
The Detuning Experiment
The Goal Measure Excited State Fraction as a
Function of Detuning
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MOTRIMS Experimental Setup
MOTRIMS Experimental Setup
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Preliminary Results
Preliminary Results
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Whats Next?
Whats Next?

• Careful Comparison to Theory For f
• Look at Different Intensities

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How Do We Measure Q Value ?
How Do We Measure Q Value ?
q
Q energy defect ? Scattering angle (Lab
frame) Pr , Pr? parallel and perpendicular
recoil momentum components PP , PP projectile
momentum before and after the collision Vp
projectile velocity nc number of transferred
electrons
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Chopping Our Lasers
Chopping Our Lasers