The width of the NaD1 line in atmospheres of helium, neon and atomic hydrogen
The usefulness of spectral linewidth measurements as a diagnostic tool has been recognised since it was first suggested that line broadening could result from atomic collisions. Various theories have been developed and modified as further experimental evidence is published. Within this broad field, one important area has been the subject of recent calculations (Roueff, 1974), that is, the broadening of the sodium D lines by atomic hydrogen.
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