Make New Entry, Make Followup Entry
User name Yi Qiang
Log entry time 19:55:33 on March 11, 2009
Entry number 265622
This entry is a followup to: 264188
keyword=More Masing testDuring this test, the small correction was turned ON with 0.45A current.
First, I tested the EPR. After all four sweeps, no masing effect spotted....
Second, I hacked Jin's auto spin flip code to have the NMR frequency weep
30 seconds prior to the Q-wave plate rotation and this time masing
happened when we flip the spin back from high energy to low energy state!
And the masing threshold is about 47% (it may be slightly different from
previously values due to the new calibration constant I put in).
Combined with findings we had in last entry, we have the following facts
with cell Samantha:
1. Masing does not happen in NMR with anti-parallel pumping
2. Masing does not happen in EPR with anti-parallel pumping
3. Masing happen in NMR with parallel pumping no matter what Rb/K
electron state is.
So one of my naive interpretation of these facts is that masing is only
related with He3 spin state, not electrons. Therefore, it can not be
bypassed by simply changing the sequence of spin flip and Q-wave plate
rotation.
A copy of this log entry has been emailed to: jinhuang, jpchen
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