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User name Yi Qiang
Log entry time 22:02:25 on April 28, 2009
Entry number 269544
This entry is a followup to: 267977
keyword=EPR calibration for Vertical pumpingBothered by very very high polarization, i did the following EPR
calibration with extreme cautious: I leave the NMR RF off when not in flip.
1. I first did a FM sweep from 10 MHz to 21 MHz: the signal below 11MHz
is most likely cable resonance, the signal at 11.5MHz is Rb EPR peak, the
signal at 14.5 is an isotope signal and the signal at 15.5 MHz is the K
EPR peak.
2. The first EPR calibration is done with the K signal.
3. The second EPR calibration is done with the Rb signal.
As a result, the two calibrations from different alkali atoms are quite
different! The K gives a constant of 3.875%/mV while the Rb only gives
3.441 %/mV. Obviously, we have something wrong in the EPR analysis code
and I will try to find it out.
Here are the data details:
Cell: Dominic
Oven Temperature: 230C
Field Direction: Vertical -
Pumping Direction: Parallel
Laser Power: 3x25 COMET
Cell Density: 7.830 amg
== EPR of K ==
Data directory: C:\AyeD\EPR\Data\EPR_AFP_20090428_2122
Calibration Constant: 3.87 %/mV
Polarization: 86.79%
Field: 24.841 G
EPR Frequency Shift: 98.38 kHz
== EPR of Rb ==
Data directory: C:\AyeD\EPR\Data\EPR_AFP_20090428_2122
Calibration Constant: 3.87%/mV
Polarization: 75.74%
Field: 24.830 G
EPR Frequency Shift: 73.45 kHz
A copy of this log entry has been emailed to: jpchen, tdaver@wm.edu, yqiang, chiran, jinhuang
Whole range EPR FM sweep
EPR FM of K
EPR AFP of K
EPR Analysis of K
EPR FM of Rb
EPR AFP of Rb
EPR Analysis of Rb
