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User name Yi Qiang
Log entry time 11:19:00 on April 20, 2009
Entry number 267193
This entry is a followup to: 267189
Followups:
keyword=EPR Calibration of Vertical puming at 220CDid three EPR calibration of cell Dominic with vertical pumping. The
first EPR suffered from a -30mV offset due to the EPR Function Generator
input saturation and by increasing the FM deviation from 70kHz/V to
80kHz/V solved the problem.
Cell: Dominic
Oven Temperature: 220C
Field Direction: Vertical +
Pumping Direction: Parallel
Laser Power: 3x25 COMET
Cell Density: 7.830 amg
EPR#1:
Data directory: C:\AyeD\EPR\Data\EPR_AFP_20090420_1029
Calibration Constant: 4.62%/mV (4.47%/mV before 30mV offset correction)
Polarization: 77.5% (75.0% before correction)
EPR#2:
Data directory: C:\AyeD\EPR\Data\EPR_AFP_20090420_1041
Calibration Constant: 4.59%/mV
Polarization: 75.9%
EPR#3:
Data directory: C:\AyeD\EPR\Data\EPR_AFP_20090420_1057
Calibration Constant: 4.56%/mV
Polarization: 75.0%
By using the calibration from the third measurement and the max NMR value
from spinup, 17.8mV, the maximum polarization of this cell is about 81%.
Very impressive!
A copy of this log entry has been emailed to: jpchen, averett, yawei, miham
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