Peer-Reviewed Journal Details
Mandatory Fields
Gradziel, ML;O'Neill, RW
2004
May
Journal Of Physics B: Atomic, Molecular And Optical Physics
Direct measurement of P+ for electron impact excitation of H(2p) at 54.4 eV
Published
11 ()
Optional Fields
DISTORTED-WAVE CALCULATION CIRCULAR-POLARIZATION MEASUREMENTS DIFFERENTIAL CROSS-SECTIONS LYMAN-ALPHA RADIATION CLOSE-COUPLING METHOD ATOMIC-HYDROGEN ANGULAR-CORRELATION 3(1)P STATE ELASTIC-SCATTERING SYSTEMATIC-ERRORS
37
1893
1907
We report results of direct measurements of the reduced Stokes parameters P-1, P-2 and P-3 for electron impact excitation of H(2p) at 54.4 eV over the scattering range 10-40degrees. These three parameters have been measured simultaneously for the first time using a VUV double-rotation polarization analyser consisting of a MgF2 retarder followed by a SiO2 reflection linear polarizer. As expected, our measurements for P-1 and P-2 are in good agreement with theoretical calculations and previous experimental data. Our data for P-3 differ significantly from previous experimental measurements and theoretical calculations. Consequently, we find that the coherence parameter P+ deviates significantly from unity at 30degrees. If correct, this signifies that spin-exchange scattering may be more important than has previously been thought.
BRISTOL
0953-4075
10.1088/0953-4075/37/9/010
Grant Details