{'fraction_non_alphanumeric': 0.017453798767967144, 'fraction_numerical': 0.004106776180698152, 'mean_word_length': 5.09375, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Electron density in low‐pressure Na‐Ne discharges deduced from laser absorption experiments

Laser absorption experiments are described to measure the radial sodium ground‐state distribution in the positive column of a low‐pressure Na‐Ne discharge. The radial electron density distribution is obtained by combining the results with a particle balance. The electron densities at the tube axis n e (0) derived in this way are approximately a factor of 2.5 higher than the ones derived from a direct determination with Langmuir probes.Measuring the sodium profiles as a function of the distance to a probe reveals quantitatively the perturbative effect on the plasma of the glass capillary that supports the probe. This partly explains the observed discrepancy in n e (0). The electron temperatureT e is deduced from the laser absorption data using the measuredelectrical conductivity of the plasma. This value of T e agrees very well with the value as measured with the probe.