Abstract
Electric field in the cathode fall region of a 2.2 Torr heliumdc discharge with 0.8 mA cm-2 current density has beenmeasured from the Stark splittings of 11 1P (unperturbed)Rydberg transition by simultaneous optogalvanic (OG) andfluorescence techniques. The LIF Stark spectra showed narrowerlinewidths compared to the OG spectra for higher parabolicquantum number states; LIF data also showed broader linewidthsfor higher parabolic quantum number states compared to the linesin the centre of the manifold. However, the electric fieldsobtained from the two methods were in agreement with each otherwithin three per cent for all the measured locations in thesheath. A comparison of the OG spectrum with the off-axis LIF datashows a combination of signal gain in the high-field regionalong with the Stark intensity distribution permits the line-of-sight-averaged OG spectrum to obtain accurate field values in adischarge with modest radial field gradients.
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